SU341373A1 - Device for measuring parameters of a beam of charged particles - Google Patents

Description

The invention relates to the field of accelerator technology and can be used in apparatus for measuring the parameters of a beam of charged particles.

A known device for measuring the parameters of a beam of charged particles from a pulse to a pulse contains a secondary emission monitor, in which one of the fouls is cut into a number of narrow isolated strips, and a set of electromagnetic relays that sequentially commute all the elements for a time shorter than following electron beam pulses. The relative inertia of the switching unit of the known device increases with an increase in the pulse frequency of the beam.

The purpose of the invention is to provide the possibility of multiple measurements of the beam parameters during a pulse of accelerated particles and to increase the reliability of the device.

The goal is achieved by the fact that in the proposed device a dielectric is placed between monitor foils in the area of the reading beam, and the elements related to one of the monitor fouls are switched, and the electrical signal from each element is measured by a cathode ray tube (CRT), The target of which is a single design with a monitor of a beam of charged particles.

FIG. 1 shows a secondary emission monitor — a target reading CRT; on

FIG. Figures 2 and 3 show variants of a block diagram of a device for measuring parameters of a beam of charged particles.

Secondary emission monitor - the target reading CRT contains a collecting

Foil 1 (a collecting vapor is fed on it), an emitting foil cut into a series of isolated elements — strips 2, and a dielectric layer 3 placed between the collecting foil 1 and the elements 2 of the emitting foil.

The monitor is installed B of the reading cathode-ray tube 4 (Fig. 2), which through the amplifying unit 5 is connected to the 1P1 Dividing cathode-ray tube b. Block 7

sweep electron beams connected to

tubes 4 and 6. Vacuum volumes of tube 4 and

conduit 8 can be for example

merged.

The device works as follows.

Monitor - target is placed on the path of the beam 9 accelerated particles. Accelerated particles, such as electrons, the passage through the elements 2 of the emitting foil, knock out of them secondary electrons, which under the influence of

1. As a result, a potential level is created at each element of the emitting foil, which is proportional to the number of accelerated electrons passing through the element. The potential relief from the elements emitted by a foil separated by a dielectric from the collecting foil is read by beam 10 of CRT 4, which successively goes around all elements 2. Received read signals are amplified in amplifying block 5 and fed to indicator CRT 6. sweep the reader; its beam tube 4 with the help of block 7, activated by pulses from the accelerator synchronization system. Each time the accelerator is launched on the screen of the indicator tube, a curve appears corresponding to the potential relief on the elements of the emitting foil, which corresponds to the distribution in the transverse plane of the intensity of the beam of Z-electrons. By varying the scan rate of the read beam and the beam of the indicator tube, as well as the frequency of the start of the sweeps, using the block 7, one can observe and measure the beam parameters from pulse to pulse and their change during a single beam of accelerated particles.

Other monipu2 .i can be used as monitors of the nuka of charged particles.

nitors working, for example, but the principle of electronically excited conductivity.

The invention makes it possible to observe and measure the intensity distribution of a beam of charged particles over the cross section, determine the position of the electrical center of gravity of the beam in space, and measure the energy spectrum of the beam of charged particles.

Subject invention

A device for measuring the parameters of a beam of charged particles, containing a monitor of a beam of relativistic charged particles, an amplifier, a scanner and an indicator cathode ray tube, characterized in that, in order to perform multiple measurements of the parameters of a nukhka during a pulse of accelerated particles and an increase in the reliability of the device by using the monitor foils as a target for a cathode ray tube reader, a dielectric is located between the monitor foils in the range of the beam. the input of the reading device is connected to the output of the scanner bolt, the other output of which is connected to the deflecting system of the indicator tube, and the output of the reading device is connected to the second

input indicator tube through the amplifier.

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