JP2012235008A - Superconductive lead and superconducting magnet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconductive current lead which can prevent decline in the critical current value of a superconductor or damage on the superconductor when a force acts on the superconductor in a direction rotating about the axis along the extension direction of the superconductor.SOLUTION: The superconductive current lead 10 has a superconductor 12 extending in one direction, two electrode terminals 13, 14 connected, respectively, with both ends 12a, 12b of the superconductor 12, and two support members 15, 16 which support, respectively, the both ends 12a, 12b of the superconductor 12 via the two electrode terminals 13, 14, respectively. The end of the superconductor 12 at least on one side thereof is supported rotatably about the axis along one direction by the support member on the same side as the end.

Description

  The present invention relates to a superconducting current lead and a superconducting magnet device using a superconductor.

  In a superconducting device such as a superconducting magnet device, a current lead for supplying power to a superconductor such as a superconducting coil is used. For example, in a superconducting magnet device, a power source installed on a room temperature side or a high temperature side and a superconducting coil installed on a low temperature side are electrically connected via a current lead. As such a current lead, it is common to use a superconductor, in particular, an oxide superconducting material such as a Y-based or Bi-based material having a high critical temperature so as not to generate Joule heat when a current flows. Hereinafter, a current lead using a superconductor is referred to as a superconducting current lead.

  Further, as a superconductor of a superconducting current lead, recently, a superconducting wire obtained by combining a superconducting material with a metal material and processed into a wire shape, particularly a superconducting tape wire, has come to be used. Since the superconducting wire or the superconducting tape wire can be manufactured relatively easily, it has an advantage that the manufacturing cost is low as compared with other superconductors such as a bulk superconductor.

  In a superconducting magnet device using a superconducting tape wire as a superconductor of a superconducting current lead, the magnetic field generated by the superconducting coil may be applied in a direction crossing the current flowing through the superconducting tape wire. Then, the Lorentz force generated by the current flowing through the superconducting current lead and the magnetic field generated by the superconducting coil acts on the superconducting tape wire.

  In addition, for example, when cooling the superconducting magnet device, as the member for fixing the superconductor tape wire contracts, a compressive force acts in the direction in which the superconductor tape wire extends, and the superconductor tape wire is distorted. May occur.

  For example, there is a method of connecting a current lead to a terminal on the high temperature side through a flexible formed by stacking conductive thin plates in order to prevent distortion of the current lead when cooling the superconducting magnet device. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 04-351460

  However, the method of connecting the superconducting current lead to the terminal on the high temperature side through the flexible formed by overlapping the conductive thin plates as described above has the following problems.

  In the method disclosed in Patent Document 1, when Lorentz force acts in a direction perpendicular to the tape surface of the superconducting tape wire, generation of distortion can be prevented. And the fall of the critical current value of the superconducting tape wire accompanying generation | occurrence | production of a distortion, or the failure | damage of a superconductor tape wire can be prevented.

  However, depending on the positional relationship with the superconducting magnet or other members, a magnetic field is applied in a direction perpendicular to the direction in which the superconducting tape wire extends and other than the direction parallel to the tape surface. May be. When a magnetic field is applied in such a direction, Lorentz force may act on the superconducting tape wire in a direction that rotates about an axis along the direction in which the superconducting tape wire extends. Normally, superconducting tape wire cannot be displaced in the direction of rotation about the axis along the direction in which the superconductor tape wire extends, so that distortion occurs in the superconducting tape wire, and the critical current value of the superconducting tape wire There is a risk of lowering the temperature or causing damage to the superconducting tape wire.

  The above-mentioned problems are common even when a superconductor other than the superconducting tape wire is used as the superconductor of the superconducting current lead, or when a force accompanying shrinkage acts upon cooling instead of the Lorentz force. It is a problem.

  The present invention has been made in view of the above points. When a force is applied to a superconductor in a direction rotating around an axis along the direction in which the superconductor extends, the criticality of the superconductor is determined. A superconducting current lead capable of preventing a decrease in current value or damage to a superconductor is provided.

  In order to solve the above problems, the present invention is characterized by the following measures.

  The present invention provides a superconductor extending along one direction, two electrode terminals each connected to each of both ends of the superconductor, and each via the two electrode terminals. Two support members for supporting each of both ends of the superconductor, and at least one end of the superconductor is along the one direction with the support member on the same side as the end. A superconducting current lead supported so as to be rotatable about an axis.

  Further, in the present invention, in the above-described superconducting current lead, the electrode terminal connected to the end on the one side is a connection member made of a flexible member, and the end that can be rotated is connected to the connection It is supported by a support member on the same side as the end through a member.

  In the superconducting current lead described above, the present invention has a connecting member made of a flexible member, and the electrode terminal connected to the rotatable end is connected to the end through the connecting member. It is supported by the support member on the same side.

  Further, the present invention provides the above-described superconducting current lead, wherein the connection member includes a plate-like member formed with a direction from the superconductor side toward the support member as a longitudinal direction, and the plate-like member includes the superconducting member. On the way from the body side to the support member side, a narrow portion having a narrower plate width than other portions is provided.

  The present invention is also directed to the above-described superconducting current lead, wherein the connecting member includes two plate-like members formed with the direction from the superconductor side to the support member side as a longitudinal direction, and each of the two plates. Are connected in series along the direction from the superconductor side to the support member side, and are formed of a plurality of thin plate members provided apart from each other along the plate width direction of the plate-like member. A sum of width dimensions of the plurality of thin plate members in the plate width direction is narrower than the plate width.

  The present invention is also a superconducting magnet device having the superconducting current lead described above and a superconducting coil connected to the low temperature side of the superconducting current lead.

  According to the present invention, when a force acts on the superconductor of the superconducting current lead in the direction of rotation about the axis along the direction in which the superconductor extends, the critical current value of the superconductor decreases or It is possible to prevent damage to the superconductor.

It is sectional drawing which shows the structure of the superconducting magnet apparatus which concerns on embodiment. It is a perspective view of a superconducting current lead according to an embodiment. It is a perspective view which expands and shows a part about an example of the plate-shaped member which consists of a flexible member. It is a perspective view which expands and shows a part about the other example of the plate-shaped member which consists of a flexible member. It is a perspective view which expands and shows a part about the other example of the plate-shaped member which consists of a flexible member. It is a perspective view which expands and shows a part about the other example of the plate-shaped member which consists of a flexible member. It is a perspective view (the 1) of the superconducting current lead concerning a comparative example. It is a perspective view (the 2) of the superconducting current lead concerning a comparative example. It is a perspective view (the 3) of the superconducting electric current lead concerning a comparative example. It is a perspective view of a superconducting current lead according to a modification of the embodiment.

Next, a mode for carrying out the present invention will be described with reference to the drawings.
(Embodiment)
<Superconducting magnet device>
Next, the superconducting magnet device 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the configuration of the superconducting magnet device 1.

  The superconducting magnet device 1 according to the present embodiment is obtained by applying a superconducting current lead 10 described later with reference to FIG. 2 to a refrigerator-cooled superconducting magnet device. As the refrigerator, for example, a one-stage or two-stage Gifford-McMahon (GM) refrigerator can be used.

  The superconducting magnet device 1 includes a vacuum vessel 2, a superconducting coil 3, a heat transfer member 4, a load support 5, a heat shield plate 6, a GM refrigerator 7, a current introduction terminal 8, a first stage current line 9, a superconducting current lead 10, And a two-stage current line 11.

  The vacuum vessel 2 has, for example, a substantially cylindrical shape. A GM refrigerator 7 is fixed on the upper surface of the vacuum vessel 2.

  Superconducting coil 3 is formed of a superconducting wire. The superconducting coil 3 is provided in a space surrounded by the heat shield plate 6. The superconducting coil 3 is connected to a later-described low-temperature side cooling stage 7d via the heat transfer member 4, and is cooled by the GM refrigerator 7 to be in a superconducting state.

  The superconducting coil 3 is connected to a low temperature side of a superconducting current lead 10 described later. The superconducting coil 3 is supplied with electric power from a power source 8 a provided outside the vacuum vessel 2 through a first-stage current line 9, a superconducting current lead 10, and a two-stage current line 11 described later.

  In the example shown in FIG. 1, the space surrounded by the superconducting coil 3 is included in the space surrounded by the heat shield plate 6. However, a recess having a cylindrical shape may be provided in the vacuum vessel 2 and the heat shield plate 6 so that the superconducting coil 3 surrounds a space defined by the recess.

  The heat transfer member 4 is provided between the superconducting coil 3 and a low-temperature side cooling stage 7d described later. The heat transfer member 4 is thermally connected to the superconducting coil 3 and the low temperature side cooling stage 7 d, and transfers the cold heat of the low temperature side cooling stage 7 d to the superconducting coil 3.

  The load support 5 is provided between the vacuum vessel 2 and the heat transfer member 4. The load support 5 is for supporting the load of the superconducting coil 3 attached to the heat transfer member 4 by attaching the heat transfer member 4 to the vacuum vessel 2.

  The heat shield plate 6 is provided inside the vacuum vessel 2. The heat shield plate 6 is for suppressing radiant heat entering the superconducting coil 3. The heat shield plate 6 is made of a material having a high electric conductivity such as copper or aluminum, and has, for example, a substantially cylindrical shape.

  The GM refrigerator 7 has a multi-stage cooling cylinder structure including a first-stage cooling cylinder 7a and a second-stage cooling cylinder 7b. The first-stage cooling cylinder 7 a is inserted into the vacuum vessel 2, and the second-stage cooling cylinder 7 b is inserted into a space surrounded by the heat shield plate 6.

  A high temperature side cooling stage 7c is fixed to the top of the top plate of the heat shield plate 6, and a first stage cooling cylinder 7a is connected to the high temperature side cooling stage 7c. The high temperature side cooling stage 7c is cooled by the first stage cooling cylinder 7a. A second stage cooling cylinder 7b is provided below the top plate of the heat shield plate 6 so as to be connected to the high temperature side cooling stage 7c. A low temperature side cooling stage 7d is connected to the lower end of the second stage cooling cylinder 7b. The low temperature side cooling stage 7d is cooled by the second stage cooling cylinder 7b. The high temperature side cooling stage 7c and the low temperature side cooling stage 7d are formed of a high thermal conductivity member such as copper or aluminum.

  The current introduction terminal 8, the first stage current line 9, the superconducting current lead 10, and the second stage current line 11 are for flowing current from the power source 8a to the superconducting coil 3. The power source 8 a is connected to the current introduction terminal 8, further passes through the first-stage current line 9, is brought into contact with the heat shield plate 6, is cooled, and is then connected to the high temperature side of the superconducting current lead 10. The low temperature side of the superconducting current lead 10 is connected to a coil electrode (not shown) of the superconducting coil 3 through the heat transfer member 4.

As the first stage current line 9, a material having a high electrical conductivity such as copper or aluminum can be used. As the two-stage current line 11, a material having a high electrical conductivity such as copper or aluminum can be used, or a high-temperature superconducting material such as Bi2223, Bi2212, Y123, or MgB _{2 in} combination with a material having a high electrical conductivity. Can be used.

In the present embodiment, the refrigerator cooled superconducting magnet device has been described. However, instead of the refrigerator-cooled superconducting magnet device, for example, a liquid-cooled superconducting magnet device using liquid helium as a coolant may be used, or a gas-cooled superconducting magnet device using evaporating gas of liquid helium as a coolant, for example.
<Superconducting current lead>
Next, the superconducting current lead 10 according to the embodiment will be described with reference to FIG.

  FIG. 2 is a perspective view of the superconducting current lead 10.

  As shown in FIG. 2, the superconducting current lead 10 according to the present embodiment includes a superconductor 12, a high temperature side electrode terminal 13, a low temperature side electrode terminal 14, a high temperature side support member 15, and a low temperature side support member 16.

  The high temperature side electrode terminal 13 is an electrode terminal provided at one end of the superconducting current lead 10. The low temperature side of the high temperature side electrode terminal 13 is connected to the high temperature side end 12 a of the superconductor 12, and the high temperature side of the high temperature side electrode terminal 13 is connected to the high temperature side support member 15. That is, the high temperature side support member 15 supports the high temperature side end portion 12 a of the superconductor 12 through the high temperature side electrode terminal 13. The high temperature side electrode terminal 13 is comprised with metals, such as copper, aluminum, and brass, which are good electrical conductors. Further, the high temperature side electrode terminal 13 and the high temperature side end portion 12a of the superconductor 12 are joined by a conductive material such as solder, indium, or conductive resin.

  The high temperature side support member 15 may be electrically connected to the high temperature side end portion 12 a of the superconductor 12 via the high temperature side electrode terminal 13. At this time, the high temperature side support member 15 and the high temperature side electrode terminal 13 are joined by a conductive material such as solder, indium, or conductive resin. Further, the high temperature side of the high temperature side support member 15 is connected to the high temperature side (one-stage current line 9 side) of the superconducting current lead 10. The high temperature side support member 15 is thermally connected to the high temperature side cooling stage 7c via the heat shield plate 6 or directly.

  The low temperature side electrode terminal 14 is an electrode terminal provided at the other end of the superconducting current lead 10. The high temperature side of the low temperature side electrode terminal 14 is connected to the low temperature side end 12 b of the superconductor 12, and the low temperature side of the low temperature side electrode terminal 14 is connected to the low temperature side support member 16. That is, the low temperature side support member 16 supports the low temperature side end portion 12 b of the superconductor 12 via the low temperature side electrode terminal 14. The low temperature side electrode terminal 14 is comprised with metals, such as copper, aluminum, and brass, which are good electrical conductors. Further, the low temperature side electrode terminal 14 and the low temperature side end portion 12b of the superconductor 12 are joined by a conductive material such as solder, indium, conductive resin, or the like.

  The low temperature side support member 16 may be electrically connected to the low temperature side end portion 12 b of the superconductor 12 through the low temperature side electrode terminal 14. At this time, the low temperature side support member 16 and the low temperature side electrode terminal 14 are joined by a conductive material such as solder, indium, conductive resin, or the like. The low temperature side of the low temperature side support member 16 is connected to the low temperature side (two-stage current line 11 side) of the superconducting current lead 10. The low temperature side support member 16 is thermally connected to the low temperature side cooling stage 7d through the heat transfer member 4.

  The superconductor 12 is provided so as to connect the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14. The superconductor 12 is provided so as to extend from the high temperature side electrode terminal 13 toward the low temperature side electrode terminal 14.

  Hereinafter, in this embodiment, an example in which the superconductor 12 is made of a superconducting tape wire will be described (the same applies to the following modifications). In FIG. 2 including FIGS. 7 to 9 described later, the direction in which the superconductor 12 made of the superconducting tape wire (hereinafter referred to as “superconducting tape wire 12”) extends is defined as the X direction. Then, the direction perpendicular to the direction in which the superconducting tape wire 12 extends and parallel to the tape surface of the superconducting tape wire 12 (hereinafter simply referred to as “tape surface”) is defined as the Y direction, and the superconducting tape. The direction perpendicular to the direction in which the wire 12 extends and perpendicular to the tape surface is taken as the Z direction. Further, the direction rotating from the Y direction to the Z direction on the plane (YZ plane) perpendicular to the direction in which the superconducting tape wire 12 extends is defined as the θ direction.

  However, not only when the superconductor 12 is composed of a superconducting tape wire, but the shape of the cross section perpendicular to the direction in which the superconductor 12 extends is out of the width dimensions along two different directions parallel to the cross section. When one is shorter than the other, for example, it may be rectangular.

As the superconductor 12 can be used, for example Bi-2223-based, Bi2212, Y123, high-temperature superconducting material MgB _2, or the like. Further, when the superconductor 12 is a superconducting tape wire, for example, on a high temperature superconducting wire covered with a multi-core wire such as Bi2223 or Bi2212 using a metal such as silver as a base material or a metal tape base material such as Hastelloy Various superconducting tape wires such as a high-temperature superconducting wire obtained by depositing a thin film such as Y123 on the surface can be used.

  As shown in FIG. 2, the superconductor 12 is embedded in the groove 31a formed in the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14 by, for example, solder bonding. Specifically, the surface of the groove 31a is thinly covered with solder by performing solder plating on the groove 31a formed in the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14. Then, the superconductor 12 is loaded into the groove 31a thinly covered with the solder, the melted solder is filled into the groove 31a in the state in which the superconductor 12 is loaded, and the solder is solidified, whereby the superconductor 12 is Solder joint. By such a method, the superconductor 12 can be reliably fixed to the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14.

  Hereinafter, in the present embodiment, the high temperature side end 12a is supported by the high temperature side support member 15 so as to be rotatable in the θ direction shown in FIG. 2, and the low temperature side end 12b is supported by the low temperature side support member 16. An example in which it is supported so as to be rotatable in the θ direction shown in FIG. 2 will be described. An example in which the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14 are both connecting members made of a flexible member will be described.

  However, if the end of at least one side of the superconductor 12 is supported by the support member on the same side as the end so as to be rotatable about an axis along the direction in which the superconductor 12 extends. Good. Moreover, the electrode terminal connected to the edge part which can be rotated centering | focusing on the axis | shaft along the direction where the superconductor 12 extends should just be a connection member which consists of a flexible member.

  In the present embodiment, the high temperature side end portion 12a of the superconductor 12 is directed to the high temperature side support member 15 via the high temperature side electrode terminal 13 made of a flexible member in the θ direction about the axis X1 along the X axis. Is rotatably supported. Further, the low temperature side end portion 12b of the superconductor 12 can be rotated in the θ direction about the axis X1 along the X axis to the low temperature side support member 16 via the low temperature side electrode terminal 14 made of a flexible member. It is supported by.

  The high temperature side electrode terminal 13 includes a terminal member 31 and a plate member 32. The terminal member 31 has a groove portion 31a. As described above, the high temperature side end portion 12a of the superconductor 12 is joined to the groove portion 31a by a conductive material such as solder, indium, or conductive resin. The plate member 32 is provided between the terminal member 31 and the high temperature side support member 15. The plate-like member 32 is formed with the direction from the superconductor 12 side toward the high temperature side support member 15 as the longitudinal direction. As shown in FIG. 2, the plate-like member 32 may be bent twice in the middle from the superconductor 12 side to the high temperature side support member 15 side, and may have an S-shape. The plate-like member 32 is made of a flexible member. In the high temperature side electrode terminal 13, the plate member 32 may be joined to the terminal member 31 or may be formed integrally with the terminal member 31.

  The low temperature side electrode terminal 14 includes a terminal member 31 and a plate member 32. The terminal member 31 has a groove 31a. As described above, the low temperature side end 12b of the superconductor 12 is joined to the groove 31a by a conductive material such as solder, indium, or conductive resin. The plate-like member 32 is formed with the direction from the superconductor 12 side toward the low temperature side support member 16 as the longitudinal direction. As shown in FIG. 2, the plate-like member 32 may be bent twice in the middle from the superconductor 12 side toward the low temperature side support member 16 side, and may have an S shape. The plate-like member 32 is made of a flexible member. In the low temperature side electrode terminal 14, the plate member 32 may be joined to the terminal member 31 or may be formed integrally with the terminal member 31.

  FIG. 3 is a partially enlarged perspective view showing an example of the plate-like member 32 made of a flexible member.

  The plate-like member 32 of the high-temperature side electrode terminal 13 may have a narrow portion 33 whose plate width is narrower than other portions on the way from the superconductor 12 side to the high-temperature side support member 15 side. Similarly, the plate-like member 32 of the low temperature side electrode terminal 14 may have a narrow portion 33 whose plate width is narrower than other portions on the way from the superconductor 12 side to the low temperature side support member 16 side. .

  The narrow portion 33 may be provided in one of two bent portions where the plate-like member 32 is bent twice in order to form an S shape, and is provided in a portion other than the two bent portions. Also good. Further, in the example shown in FIG. 3, the narrow portion 33 is formed with slits from both the positive and negative sides in the Y direction along the Y direction which is the plate width direction of the plate member 32, and the plate width at the center in the plate width direction. Is a narrowed part.

  Thus, by providing the narrow portion 33, the plate-like member 32 can be provided with flexibility. And when the part which pinches | interposes the narrow part 33 from both sides along the longitudinal direction of the plate-shaped member 32 is set to 33a, 33b, the axis | shaft along the direction in which the superconductor 12 extends with respect to the part 33b is 33a. It can be made to be rotatable around the center.

  As shown in FIG. 3, the portions 33 a and 33 b may have wide portions 33 c and 33 d that are wider than other portions.

  FIG. 4 is a partially enlarged perspective view showing another example 32a of a plate-like member made of a flexible member.

  The plate-like member 32a of the high temperature side electrode terminal 13 may have two narrow portions 34 and 35 having a narrower plate width than other portions in series along the longitudinal direction. Similarly, the plate-like member 32a of the low temperature side electrode terminal 14 may have two narrow portions 34, 35 having a narrower plate width than other portions in series along the longitudinal direction.

  The two narrow portions 34 and 35 may be provided in one of two bent portions where the plate-like member 32a is bent twice in order to form an S-shape, and may be provided in a portion other than the two bent portions. It may be provided. In the example shown in FIG. 4, the narrow portion 34 is formed with a slit-shaped cut portion 34 a from the + Y direction side along the Y direction which is the plate width direction of the plate member 32 a, and the plate width direction −Y. This is the part left on the direction side. Further, the narrow portion 35 is a portion where a slit-like cut portion 35a is formed from the −Y direction side along the Y direction which is the plate width direction of the plate member 32a, and remains on the plate width direction + Y direction side. is there.

  Thus, by providing the notches 34a and 35a, flexibility can be imparted to the plate member 32a. And when the part which pinches | interposes the narrow parts 34 and 35 from both sides along the longitudinal direction of the plate-shaped member 32a is set to 34b and 35b, the part 34b is along the direction where the superconductor 12 extends with respect to the part 35b. It can be made to be rotatable around the axis.

  In addition, many notches 34a and 35a may be formed alternately along the longitudinal direction of the plate-shaped member 32a. By forming a large number of the notches 34a and 35a, the flexibility of the plate-like member 32a can be enhanced.

  FIG. 5 is a partially enlarged perspective view showing another example 32b of a plate-like member made of a flexible member.

  The plate-like member 32b of the high-temperature side electrode terminal 13 may have two plate-like members 36 and 37 formed with the direction from the superconductor 12 side toward the high-temperature side support member 15 as the longitudinal direction. Further, the plate-like member 32b of the high-temperature side electrode terminal 13 connects the two plate-like members 36 and 37 in series along the longitudinal direction and is connected to each other along the plate width direction of the two plate-like members 36 and 37. You may have the thin-plate part 38 which consists of several thin-plate member 38a spaced apart and provided in parallel.

  The plate-like member 32b of the low-temperature side electrode terminal 14 may also have two plate-like members 36 and 37 formed with the direction from the superconductor 12 side toward the low-temperature side support member 16 as the longitudinal direction. Further, the plate-like member 32b of the low temperature side electrode terminal 14 connects the two plate-like members 36 and 37 in series along the longitudinal direction and is connected to each other along the plate width direction of the two plate-like members 36 and 37. You may have the thin-plate part 38 which consists of several thin-plate member 38a spaced apart and provided in parallel.

  The thin plate portion 38 may be provided in one of two bent portions where the plate-like member 32b is bent twice in order to form an S shape, and is provided in a portion other than the two bent portions. Also good. Further, the sum of the width dimensions of the plate-like members 36 and 37 in the plate width direction of the plurality of thin plate members 38 a is narrower than the plate width of the plate-like members 36 and 37.

  The thin plate member 38a is also made of a metal such as copper, aluminum or brass, which is a good electrical conductor. Further, the thin plate member 38a and the plate-like members 36 and 37 are joined by a conductive material such as solder, indium, or conductive resin.

  Thus, by providing the thin plate portion 38, flexibility can be imparted to the plate-like member 32b. The plate-like member 36 can be rotated with respect to the plate-like member 37 around an axis along the direction in which the superconductor 12 extends.

  FIG. 6 is a partially enlarged perspective view showing another example 32c of a plate-like member made of a flexible member.

  The plate-like member 32c of the high temperature side electrode terminal 13 may have a net line portion 39 made of a net line on the way from the superconductor 12 side to the high temperature side support member 15 side. Similarly, the plate-like member 32c of the low temperature side electrode terminal 14 may have a net line portion 39 made of a net line on the way from the superconductor 12 side to the low temperature side support member 16 side. The mesh portion 39 may be provided in one of two bent portions where the plate-like member 32c is bent twice in order to form an S shape, and is provided in a portion other than the two bent portions. Also good.

  As described above, by providing the mesh portion 39, flexibility can be imparted to the plate-like member 32c. And when the part which pinches | interposes the mesh | network part 39 from both sides along the longitudinal direction of the plate-shaped member 32c is set to 39a, 39b, the axis | shaft along the direction where the superconductor 12 extends with respect to the part 39b is 39a. It can be made to be rotatable around the center.

  The mesh line 39 is also composed of a metal mesh line such as copper, aluminum, or brass, which is a good electrical conductor. Further, the mesh portion 39 and the portions 39a and 39b are joined by a conductive material such as solder, indium, or conductive resin.

  Next, referring to FIG. 7 to FIG. 9, when a force is applied to the superconductor in the direction of rotation about the axis along the direction in which the superconductor extends, the critical current value of the superconductor is The effect that can prevent the decrease or the damage of the superconductor will be described in comparison with the comparative example.

  7 to 9 are perspective views of a superconducting current lead (comparative example) in which neither a high temperature side electrode terminal nor a low temperature side electrode terminal includes a flexible member.

  As shown in FIG. 7, the superconducting current lead 110 according to the comparative example includes a superconductor 12, a high temperature side electrode terminal 113, a low temperature side electrode terminal 114, a high temperature side support member 15, and a low temperature side support member 16. The superconductor 12, the high temperature side support member 15, and the low temperature side support member 16 can be the same as the superconducting current lead 10 according to the embodiment, and the description thereof is omitted.

  The high temperature side electrode terminal 113 is an electrode terminal provided at one end of the superconducting current lead 110. The low temperature side of the high temperature side electrode terminal 113 is connected to the high temperature side end of the superconductor 12, and the high temperature side of the high temperature side electrode terminal 113 is connected to the high temperature side support member 15. However, the high temperature side electrode terminal 113 does not include a flexible member.

  The low temperature side electrode terminal 114 is an electrode terminal provided at one end of the superconducting current lead 110. The high temperature side of the low temperature side electrode terminal 114 is connected to the low temperature side end of the superconductor 12, and the low temperature side of the low temperature side electrode terminal 114 is connected to the low temperature side support member 16. However, the low temperature side electrode terminal 114 does not include a flexible member.

  In the following, it is assumed that the current I flows in the direction from the top to the bottom (+ X direction) along the superconducting tape wire 12.

  FIG. 7 shows that the magnetic field B generated by the superconducting coil 3 when the current I flows through the superconducting tape wire 12 is perpendicular to the direction in which the superconducting tape wire 12 extends, and the width of the superconducting tape wire is wide. The case where it arrange | positions so that it may apply in the direction (+ Z direction) perpendicular | vertical to a surface (tape surface) is shown. Further, FIG. 8 shows that the magnetic field B generated by the superconducting coil 3 when the current I flows through the superconducting tape wire 12 is perpendicular to the direction in which the superconducting tape wire 12 extends, and on the tape surface. The case where it arrange | positions so that it may apply in a parallel direction (+ Y direction) is shown.

  Normally, the critical current value of the superconducting tape wire 12 when the magnetic field B is applied parallel to the tape surface (FIG. 8) is the same as that when the magnetic field B is applied perpendicular to the tape surface (FIG. 7). It is larger than the critical current value of the superconducting tape wire 12. Therefore, it is advantageous for the superconducting magnet device to operate in the arrangement as shown in FIG.

  However, depending on the positional relationship between the superconducting tape wire 12 and the superconducting magnet, the magnetic field B applied to the superconducting tape wire 12 is applied in parallel to the tape surface and the component applied perpendicular to the tape surface. May have ingredients. At this time, due to the Lorentz force F applied to the superconducting tape wire 12, a force acts in a direction (θ direction) rotating around an axis along the direction (X direction) in which the superconducting tape wire 12 extends. There is. In the comparative example, the superconducting tape wire 12 cannot be displaced in a direction (θ direction) that rotates around an axis along a direction (X direction) in which the superconducting tape wire 12 extends. Therefore, the superconducting tape wire 12 is distorted, which may cause a decrease in the critical current value of the superconductor or damage to the superconductor.

  Alternatively, as shown in FIG. 9, when the superconducting coil 3 is cooled from room temperature to an extremely low temperature of about 4K, for example, by the GM refrigerator 7, the superconducting tape wire 12 is contracted with the contraction of the member that fixes the superconducting tape wire 12. Compressive force Fth that compresses in the direction in which the pressure extends may act. At this time, a force may act on the superconducting tape wire 12 in a direction perpendicular to the direction in which the superconducting tape wire 12 extends and in a direction perpendicular to the tape surface (Z direction). For this reason, the compression force Fth and the Lorentz force F may cause a force to act in the direction of rotation about the axis along the direction in which the superconducting tape wire 12 extends (θ direction). Even in such a case, in the comparative example, the superconducting tape wire 12 is distorted, which may cause a decrease in the critical current value of the superconductor or breakage of the superconductor.

On the other hand, in the present embodiment, as described with reference to FIGS. 2 to 6, the high temperature side electrode terminal 13 and the low temperature side electrode terminal 14 include a flexible member. The high-temperature side end 12a of the superconductor 12 is supported by the high-temperature side support member 15 via the high-temperature side electrode terminal 13 so as to be rotatable about an axis along the direction in which the superconductor 12 extends. ing. Further, the low temperature side end portion 12b of the superconductor 12 is supported by the low temperature side support member 16 through the low temperature side electrode terminal 14 so as to be rotatable about an axis along the direction in which the superconductor 12 extends. ing. As a result, when a force is applied to the superconductor in a direction that rotates about the axis along the direction in which the superconductor extends, it prevents a decrease in the critical current value of the superconductor or damage to the superconductor. be able to.
(Modification of the embodiment)
Next, a superconducting current lead 10a according to a modification of the embodiment will be described with reference to FIG. In the superconducting current lead 10a according to this modification, the electrode terminal does not include the flexible member, and the electrode terminal is supported by the support member via the connection member made of the flexible member.

  The superconducting current lead 10a according to this modification can also constitute a superconducting magnet device similar to the superconducting magnet device 1 according to the embodiment. Therefore, in this modification, description about the superconducting magnet device is omitted.

  FIG. 10 is a perspective view of the superconducting current lead 10a.

  As shown in FIG. 10, the superconducting current lead 10a according to the present modification includes a superconductor 12, a high temperature side electrode terminal 13a, a low temperature side electrode terminal 14a, a high temperature side support member 15, a low temperature side support member 16, and a high temperature side connection member. 23 and a low-temperature side connection member 24. The superconductor 12, the high temperature side support member 15, and the low temperature side support member 16 can be the same as the superconducting current lead 10 according to the embodiment, and the description thereof is omitted.

  The high temperature side electrode terminal 13a is an electrode terminal provided at one end of the superconducting current lead 10a. The high temperature side electrode terminal 13a is comprised with metals, such as copper, aluminum, and brass, which are good electrical conductors. The low temperature side of the high temperature side electrode terminal 13 a is connected to the high temperature side end 12 a of the superconductor 12.

  However, in this modification, the high temperature side electrode terminal 13a does not include a flexible member. That is, the high temperature side electrode terminal 13a has the same configuration as the high temperature side electrode terminal 113 in the comparative example.

  The low temperature side electrode terminal 14a is an electrode terminal provided at one end of the superconducting current lead 10a. The low temperature side electrode terminal 14a is comprised with metals, such as copper, aluminum, and brass, which are good electrical conductors. The high temperature side of the low temperature side electrode terminal 14 a is connected to the low temperature side end 12 b of the superconductor 12.

  However, in this modification, the low temperature side electrode terminal 14a does not include a flexible member. That is, the low temperature side electrode terminal 14a has the same configuration as the low temperature side electrode terminal 114 in the comparative example.

  In this modification, the high temperature side electrode terminal 13a is supported by the high temperature side support member 15 via the high temperature side connection member 23 made of a flexible member. Moreover, the low temperature side electrode terminal 14a is supported by the low temperature side support member 16 via the low temperature side connection member 24 which consists of a flexible member.

  In this modification as well, at least one end of the superconductor 12 can be rotated about a shaft along the direction in which the superconductor 12 extends to the support member on the same side as the end. It only has to be supported. In addition, the electrode terminal connected to the end portion rotatable about the axis along the direction in which the superconductor 12 extends is supported on the same side as the end portion via a connecting member made of a flexible member. What is necessary is just to be supported by the member.

  The low temperature side of the high temperature side connection member 23 is connected to the high temperature side electrode terminal 13 a, and the high temperature side of the high temperature side connection member 23 is connected to the high temperature side support member 15. The high temperature side connecting member 23 is made of a metal such as copper, aluminum, or brass that is a good electrical conductor. The high temperature side connection member 23 and the high temperature side electrode terminal 13a are bonded together by a bonding material 25 made of a conductive material such as solder, indium, or conductive resin. Further, the high temperature side connection member 23 and the high temperature side support member 15 are also joined by a conductive material such as solder, indium, or conductive resin.

  The low temperature side of the low temperature side connection member 24 is connected to the low temperature side electrode terminal 14 a, and the high temperature side of the low temperature side connection member 24 is connected to the low temperature side support member 16. The low temperature side connecting member 24 is made of a metal such as copper, aluminum, or brass that is a good electrical conductor. The low-temperature side connection member 24 and the low-temperature side electrode terminal 14a are bonded together by a bonding material 26 made of a conductive material such as solder, indium, or conductive resin. Further, the low temperature side connection member 24 and the low temperature side support member 16 are joined by a conductive material such as solder, indium, conductive resin, or the like.

  The high temperature side connecting member 23 includes a plate-like member 32d. The plate-like member 32d is formed with the direction from the high temperature side electrode terminal 13a side toward the high temperature side support member 15 as the longitudinal direction. As shown in FIG. 10, the plate-like member 32d may be bent twice in the middle from the high temperature side electrode terminal 13a side to the high temperature side support member 15 side, and may have an S shape. The plate-like member 32d is made of a flexible member.

  The low temperature side connection member 24 includes a plate-like member 32d. The plate-like member 32d is formed with the direction from the low temperature side electrode terminal 14a side to the low temperature side support member 16 side as the longitudinal direction. As shown in FIG. 10, the plate-like member 32d may be bent twice in the middle from the low temperature side electrode terminal 14a side to the low temperature side support member 16 side, and may have an S shape. The plate-like member 32d is made of a flexible member.

  In this modification, the plate-like member 32d has a narrow portion having a plate width narrower than that of other portions in the middle along the longitudinal direction, like the plate-like member 32 described with reference to FIG. 3 in the embodiment. You may have. Further, the plate-like member 32d has two narrow portions that are narrower than other portions in series along the longitudinal direction in the same way as the plate-like member 32a described with reference to FIG. 4 in the embodiment. You may have. Further, the plate-like member 32d is similar to the plate-like member 32b described with reference to FIG. 5 in the embodiment, and includes a plurality of thin plate members provided in parallel and spaced apart from each other along the longitudinal direction. It may have a thin plate portion. Moreover, the plate-like member 32d may have a mesh portion made of mesh wires in the middle along the longitudinal direction, like the plate-like member 32c described with reference to FIG. 6 in the embodiment.

  In the present modification, the high temperature side electrode terminal 13a is pivotable in the θ direction about the axis X1 along the direction in which the superconductor 12 extends via the high temperature side connection member 23, so that the high temperature side support member 15 can rotate. It is supported by. Moreover, the low temperature side end portion 12b of the superconductor 12 can rotate in the θ direction about the axis X1 along the direction in which the superconductor 12 extends via the low temperature side electrode terminal 14a. 16 is supported. As a result, when a force is applied to the superconductor in a direction that rotates about the axis along the direction in which the superconductor extends, it prevents a decrease in the critical current value of the superconductor or damage to the superconductor. be able to.

  Furthermore, in this modification, since the connection member is made of a flexible member, it is not necessary to provide a narrow portion or a thin plate portion in order to impart flexibility to the high temperature side electrode terminal and the low temperature side electrode terminal. Therefore, normal components can be used as the high temperature side electrode terminal and the low temperature side electrode terminal, and the manufacturing cost of the superconducting current lead can be reduced.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be modified or changed.

  For example, the portion connected to the low temperature side support member of the low temperature side electrode terminal is a rotating part formed in a disk shape having a central axis parallel to the direction in which the superconductor extends, and the low temperature side electrode of the low temperature side support member The portion connected to the terminal may be a recess formed to receive the rotating portion. Then, the lower surface of the rotating portion is joined to the bottom surface of the recess by a soft conductive material such as indium, and the conductive material is deformed, so that the rotating portion is connected to the recess along the axis along the direction in which the superconductor extends. You may support so that rotation is possible centering on.

  Alternatively, the portion connected to the high temperature side support member of the high temperature side electrode terminal is extended to the outside of the vacuum vessel, and the extended high temperature side electrode terminal and the high temperature side support member provided outside the vacuum vessel are, for example, a bearing or the like May be connected so as to be relatively rotatable. And you may support a high temperature side electrode terminal with respect to the high temperature side support member so that rotation is possible centering | focusing on the axis | shaft along the direction where a superconductor extends.

DESCRIPTION OF SYMBOLS 1 Superconducting magnet apparatus 2 Vacuum container 3 Superconducting coil 4 Heat transfer member 5 Load support 6 Heat shield plate 7 GM refrigerator 7a First stage cooling cylinder 7b Second stage cooling cylinder 7c High temperature side cooling stage 7d Low temperature side cooling stage 8 Current Introduction terminal 8a Power source 9 First stage current line 10 Superconducting current lead 11 Second stage current line 12 Superconductor (superconducting tape wire)
12a High temperature side end 12b Low temperature side end 13, 13a High temperature side electrode terminal 14, 14a Low temperature side electrode terminal 15 High temperature side support member 16 Low temperature side support member 23 High temperature side connection member 24 Low temperature side connection member 32, 32a, 32b, 32c Plate-like members 33, 34, 35 Narrow portion 38 Narrow plate portion 38a Narrow plate member 39 Mesh portion

Claims (6)

A superconductor extending along one direction;
Two electrode terminals each connected to each of the ends of the superconductor;
Each having two support members for supporting each of both ends of the superconductor via each of the two electrode terminals;
An end portion on at least one side of the superconductor is supported on a support member on the same side as the end portion so as to be rotatable about an axis along the one direction. The electrode terminal connected to the end of the one side is a connection member made of a flexible member,
The superconducting current lead according to claim 1, wherein the rotatable end portion is supported by a support member on the same side as the end portion via the connection member. Having a connecting member made of a flexible member;
The superconducting current lead according to claim 1, wherein the electrode terminal connected to the rotatable end is supported by a support member on the same side as the end via the connection member. The connection member includes a plate-like member formed with a direction from the superconductor side toward the support member as a longitudinal direction,
4. The superconducting current lead according to claim 2, wherein the plate-like member has a narrow portion having a narrower plate width than other portions in the middle from the superconductor side to the support member side. 5. The connecting member is
Two plate-like members formed with the direction from the superconductor side toward the support member side as a longitudinal direction;
Each of the two plate-like members is connected in series along a direction from the superconductor side to the support member side, and a plurality of plates are provided apart from each other along the plate width direction of the plate-like member. A thin plate portion made of a thin plate member,
The superconducting current lead according to claim 2 or 3, wherein a sum of width dimensions of the plurality of thin plate members in the plate width direction is narrower than the plate width. The superconducting current lead according to any one of claims 1 to 5,
A superconducting magnet device having a superconducting coil connected to a low temperature side of the superconducting current lead.

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