SU1334405A1 - Device for measuring parameters of charged particles beam - Google Patents

Abstract

The invention relates to accelerator technology and can be used in electrophysical installations operating with direct current beams. The aim of the invention is to increase the junction span of the device. To do this, an additional magnetic screen 6 is inserted into the device with evenly spaced N A $ (L

Description

by coils 7p placed on diametrically opposite sides and on the distance from the center of the vacuum chamber 8 with a beam of 9 charged particles passing through it. The device also contains ferrozon1

The invention relates to an accelerator technique, namely, devices for measuring the position and current of a beam of charged particles, and can be used in electrophysical installations operating with direct current beams.

The aim of the invention is to increase the sensitivity of the device.

Fig, 1 and 2 shows the block diagram of the device; Fig. 3 is a control circuit; figure 4 - timing charts of the device; Fig. 5 is a drawing of an additional magnetic screen.

The device contains flux-probes 1 with excitation windings 2 of signal 3, additional feedback 4 and feedback 5 placed in additional magnetic screens 6 with windings evenly spaced on them. 7 and placed on diametrically opposite sides and at equal distances relative to the center of the vacuum chamber 8 with the beam of charged particles passing through it, a common electromagnetic screen 10 excitation generator 11, control circuit 12, amplifiers. 13, synchronous detectors 14, analog switches 15, amplifiers 16, integrating elements 17, subtraction circuits 18, division 19, addition 20, current indicator 21, position indicator 22, feedback resistors 23.

The control circuit 12 shown in FIG. 3 consists of a power amplifier 24 and a modulating pulse generator 25.

The device works in the following way.

The flux-probes 1 are placed in additional magnetic screens 6 (Fig. 5) with which magda 1 is modulated with excitation windings 2, signal 3, additional feedback 4 and feedback 5, common electromagnetic screen 10, excitation generator P, control circuit 12 , 5 il.

beam field 9, and into a common electromagnetic shield 10 to protect the flux-probes from external magnetic fields.

Induction in controlled magnetic screens 6, periodically with a frequency determined by control circuit 12, reaches its end, t, e, its magnetic permeability is modulated

On the windings 2 of the excitation of the flux-probes 1, a current with frequency f is supplied from the generator 11 of the excitation. In the presence of a magnetic field of the beam, the signal windings 3 of the flux-probes 1 are disconnected with a frequency of 2f proportional to the magnitude of the magnetic field of the beam. Go control circuit 12 for winding 7 additional magnetic

screen 6 receives rectangular current pulses with periodically changing phase I (fig.4a). In the absence of current through the windings of 7 additional magnetic screens 6 magnetic field

The beam 9 does not reach the flux-probes 1 and with the signal: x windings 3 the noise voltage (noise) comes. In the presence of current through the winding 7, an additional magnetic screen 6 loses its magnetic permeability and the magnetic field of the beam 9 reaches the flux-probes 1, from the signal windings 3 of which the sum of signals proportional to

beam current and noise. I

At the output of synchronous detectors 14 (Fig. 4b), with additional feedback open (windings 4 are disconnected), a voltage arises in the form of a useful signal and noise (interference).

Interference signals in the time intervals when the beam field is shielded by an additional screen 6 (no current in the windings 7) are allocated by analog switches 15 (see Uj. Fig. 4b), control

31334405

from the control circuit 12,

No ladies with a bundle with and throughout the world in the wake of the elec- tron;

amplifiers 16 and through the integrating elements 17 are fed to the windings of the additional feedback 4.

When the additional feedback is closed, the output of the synchronous detector receives voltage U (Fig. 4), in which the interference is suppressed, since the depth of the additional feedback on interference can be more than 100%, and feedback on the useful signal (via resistors 23 feedback and feedback windings 5) may be two, three orders of magnitude smaller. The selective amplifier must have a bandwidth so that signals from flux-probes modulated with the frequency of the control circuit can pass through it without distortion. When choosing a control circuit frequency that is 2-3 orders of magnitude lower than the frequency of the excitation generator, obtaining the desired bandwidth of the selective amplifier presents no difficulty.

Claims (1)

1. A device for measuring the parameters of a beam of charged particles, containing primary transducers made in the form of flux-probes arranged symmetrically with respect to the axis of the beam transport channel, enclosed in a common electromagnetic screen and equipped with signal windings, feedback windings and excitation windings, while sigg the main windings are connected to the inputs of selective amplifiers, the outputs of which are connected to the inputs of synchronous detectors, the outputs of the latter 0 five 0 The inputs of the adding and subtracting circuits, the outputs of which are connected to the inputs of the dividing circuit, the output of which is connected to the beam position indicator, the output of the adding circuit are connected to the beam current indicator, the field windings are connected to the excitation generator and synchronous detectors, in order to increase sensitivity, additional magnetic screens placed around each fluxgate, made in the form of cores with excitation windings, control circuit, analog switches amplifiers, integrated elements, windings of additional feedback, located on flux-probes, and feedback resistors, while the outputs of synchronous detectors are connected to the inputs of analog switches and, through feedback resistors to feedback windings, 5 of the analog switches are connected to one from the outputs of the control circuit, the other output of which is connected to the series-connected windings of the excitation of additional magnetic screens, and the outputs of the analog switches are connected to the inputs of amplifiers, the outputs of which through and The operating elements are connected to the windings of the additional feedback. 2 о Device pop.1, which differs from the fact that the control circuit is made in the form of a modulating pulse generator and a power amplifier, while the output of the modulating pulse generator is connected to the input of the power amplifier and to the control inputs of analog switches, and the output the power amplifier is connected to the field windings of additional magnetic screens. 0 AT 0 five but FIG. 3 6 W 3 Pi / a. Winding 7 Controls and PA - jHurrtHoiiJr screen 6 fts8.5 Editor N.Slobod nickname Compiled by E.Gromov Tech. Ed. 0l iynyk Order 3983/58 Circulation 801 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4 MoSharoshi Corrector