JPS62110236A - Gyrotron device - Google Patents

Abstract

PURPOSE:To generate an electromagnetic wave (millimeter wave) beam of large output, and transmit output waves to plasma so effectively as well as to make the focusable, by installing a reflector for deflecting a bean axis of the electromagnetic wave beam propagating an optical system. CONSTITUTION:This device consists of a magnetic coil 2 forming a magnetic field to guide an electron beam 7 to a magnetron type electron gun emitting a hollow electron beam 7, circular mirrors 3 and 4 constituting a quasi-optical resonator for converting electron turning energy into electromagnetic wave energy, and plural circular mirrors 5 for transmitting the hollow electromagnetic wave beam 8 emitted out of a partial transmitting type mirror 4 up to nuclear fusion plasma 10. The electromagnetic wave beam 7 is made incident in a reflector 6 to deflect a beam axis, and the energy of the electron beam 7 hit to the reflector 6 is recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gyrotron device that generates an electromagnetic beam.

[Technical background of the invention and its problems]

In conventional waveguide-type gyrotron devices, it has been difficult to increase the output power for high-frequency electromagnetic waves because there is a limit to increasing the resonator diameter. For this reason, when attempting to heat the plasma of a nuclear fusion reactor, a large number of these gyrotron devices must be used. In addition, in the above-mentioned gyrotron device, the output waves are transmitted through a waveguide, but the loss is large when transmitting high-frequency electromagnetic waves, and a large number of waveguides are required to transmit high-power electromagnetic waves. complicating heating.

[Purpose of the invention]

The present invention generates a high-power electromagnetic wave beam, efficiently transmits and focuses the output wave with plasma, and when heating a fusion plasma, the neutron flux emitted from the plasma is transferred to an electron gun or superconducting coil. It is an object of the present invention to provide a gyrotron device having a structure in which it is possible to shield this in the middle of a transmission system so as not to irradiate it.

[Summary of the invention]

The present invention provides a quasi-optical gyrotron having an optical system consisting of a plurality of annular mirrors, which is equipped with a reflecting mirror for deflecting the beam axis of an electromagnetic beam propagating through this optical system. This is a gyrotron device that prevents the neutron flux emitted from the electron gun or superconducting coil from irradiating the electron beam, and allows the electron beam to be collected by a part of the bracket's reflector.

〔Effect of the invention〕

According to the present invention, it is possible to generate a high-power electromagnetic wave (millimeter wave) beam, efficiently transmit and focus the output wave to the plasma, and when heating the fusion plasma, the neutron flux emitted from the plasma is This can be easily shielded midway so that it does not irradiate the electron gun or superconducting coil. Recovery of the electron beam is also easy.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention.

The gyrotron device includes a magnetic coil 2. which generates a magnetic field to guide the electron beam 7 to a magnetron type electron gun which emits a hollow electron beam 7. An annular mirror 3.4 constituting a quasi-optical resonator for converting the rotational energy of electrons into electromagnetic wave energy (the mirror 4 is a partially transmitting mirror in which a plurality of slits 4s are provided in an annular shape)
, consists of a plurality of annular mirrors 5 for transmitting a hollow electromagnetic wave beam 8 emitted from a partially transmitting mirror 4 to a fusion plasma 10, and although not shown, the elements other than the coil are housed in a vacuum container. It is stored in.

Each annular mirror is also embedded with a cooling pipe or jacket. Electromagnetic wave beam 7 is.

In order to deflect the beam axis, it is incident on the reflection IR6 (
(A neutron shielding material 11 may be placed behind the reflecting mirror.)
. The energy of the electron beam 7 that hits this reflecting mirror 6 is recovered. If the electron beam is applied directly to the reflecting mirror, if there is a possibility that the reflecting mirror surface will be distorted due to thermal stress, a hole may be made in the reflecting mirror as shown in Figure 2, and the electron beam collector 9 located behind the Beam 7 may be recovered. Furthermore, the entire gyrotron device may be surrounded by a shielding material, and this reflecting mirror 6 may be either a flat or curved mirror.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a quasi-optical gyrotron device having an optical system composed of a plurality of annular mirrors according to an embodiment of the present invention, and FIG. 2 is a hollow gyrotron device showing another embodiment of the present invention. FIG. 2 is a sectional view of a main part of an example in which a hole is provided in a reflecting mirror for deflecting the beam axis of an electromagnetic beam. 1... Magnetron type electron gun 2... Magnetic coil 3.5... Annular mirror 4... Partial transmission mirror 6... Reflector 7... Hollow electron beam 8... Hollow electromagnetic wave Beam 9...Electron beam collector 10...Fusion plasma 11...Neutron shielding material agent Patent attorney Nori Chika Ken Yudo Kikuo Takehana! Figure 1

Claims (2)

[Claims] (1) An electron gun that emits a hollow electron beam, a magnetic field generating means that generates a magnetic field for causing cyclotron motion in the electron beam emitted from the electron gun, and One or more annular mirrors are arranged, and the electromagnetic waves generated when the electron beam passes through the magnetic field are reflected quasi-optically and resonated.
A gyrotron device comprising a quasi-optical gyrotron having a quasi-optical resonator that outputs a hollow electromagnetic beam, the gyrotron device comprising a reflecting mirror for deflecting the beam axis of the hollow electromagnetic beam. (2) The gyrotron device according to claim 1, wherein the reflecting mirror is a hollow electron beam collector.