SU1392645A1 - Method of measuring transverse distribution of charges in charged particle beams - Google Patents

Abstract

This invention relates to technical physics. The method of measuring the transverse distribution of charges in beams (P) of charged particles (P) is implemented in the device. The residual gas P 1 formed during the ionization of the test P 1 and 1 g in the extracting electric field of the capacitor 2 acquires different energy depending on the place of their origin. The passage through the forming gap (FSC) 3, they form a ribbon P, the spatial distribution of Ч in which corresponds to the distribution of в in the test P in the direction perpendicular to the direction of extraction, and the distribution of H in energy corresponds to the distribution of in the test P in the direction parallel to the extraction . In the absence of an electric field deviating capacitor, 4 × 1 and 1 form, on the measuring electrodes of the collector 5, a one-coordinate distribution corresponding to the distribution of H in the test P in the direction perpendicular to the extraction direction (l,, 1). The constant electric field of the capacitor 4, perpendicular to FSH 3, deflects H 1 and 1 to different angles depending on their energy and on the measuring electrodes of the collector 5 a two-dimensional distribution is formed and 1 and Ij corresponding to the distribution of H in the cross section of the studied P. The invention improves the speed of the method and simplifies its implementation. 1 hp f-ly, 2 ill. ё С / с

Description

sg

The invention relates to technical physics, in particular to accelerator technology, and can be used on accelerators of various types for monitoring the spatial parameters of an accelerated particle beam.

The purpose of the invention is to increase the speed of the method and simplify its implementation.

Figures 1 and 2 are a schematic representation of two projections of a device implementing this method of measurement.

Figures 1 and 2 show the beam 1 under study, the capacitor forming the extracting electric field 2, forming the slit 3, the condensate VIYn and does not contain, in particular, power sources and recording equipment. As a matrix collector, an electron-optical converter with

torus 4, which forms the deflecting elec tropic optical field followed by recording, measuring electrical and

images of television equipment. In this case, on the television monitor screen there will be a stationary image of the lateral distribution in the beam under study. The spatial resolution of the proposed method depends on the intensity of the extracting floor and the size of the forming gap. With a field strength of 1 kV / cm and a transverse slot size of 1 mm, the spatial resolution of the method of measuring the transverse distribution is g. 1 mm x X 1 mm. With typical sizes of 100 mm, the time of formation of the distribution of particles formed during ionization on the measuring-jx electrodes of the matrix collector when ions are extracted is not, when electrons are extracted, this time decreases to a value of 2-5.

1. dies of the matrix collector 5, 1, formed during the ionization of the particle.

The method is carried out as follows.

Particles 1 formed during ionization by the beam 1 under investigation by the remaining gas

one

in extracting electrical

The field of capacitor 2 acquires different energy depending on the place of their occurrence. Passing through the Lorm of the slit 3, they form a ribbon beam, the spatial distribution of particles in which corresponds to the distribution of particles in the beam under study in the direction perpendicular to the direction of extraction, and the distribution of particles in energy corresponds to the distribution of particles in the beam under study in a direction parallel to the direction of extraction. In the absence of a capacitor 4 deviating an electric field, the particles 1, Ij arising during ionization form on the measuring electrodes of the collector 5 a one-coordinate distribution corresponding to the distribution of particles in the beam under study in the direction perpendicular to the direction of extraction (1, Ij). The constant electric field of the capacitor 4, which is perpendicular to the Lorniing slit 3, deflects the particles.1 If, 1 that appear during ionization at different angles depending on their energy, i.e. depending on the place of their occurrence. Thus, on the measuring electrodes of the matrix collector 5, a two-dimensional distribution of air is formed.

particles with ionization 1, 1

corresponding to the distribution of particles in the cross section of the beam under study. Nonlinearity of deviation

y where ai is the angle of deviation, h

Е - energy of a particle, can be taken into account, for example, by appropriate placement of the electrodes of the matrix collector 5 or during further processing of information by means of computer technology.

The meter diagram illustrates the principle of the proposed method of measurement. It does not contain, in particular, power sources and recording equipment. As a matrix collector, an electron-optical converter with

subsequent registration of the optical

images of television equipment. In this case, a stationary image of the lateral distribution in the beam under study will be displayed on the screen of the television monitor. The spatial resolution of the proposed method depends on the intensity of the extracting floor and the size of the forming gap. With a field strength of 1 kV / cm and a transverse slot size of 1 mm, the spatial resolution of the method of measuring the transverse distribution is g. 1 mm x X 1 mm. With typical sizes of 100 mm, the time of formation of the distribution of particles formed during ionization on the measuring-jx electrodes of the matrix collector when ions are extracted is not, when electrons are extracted, this time decreases to a value of 2-5.

Thus, in this method of measuring the lateral distribution, the time of formation of the distribution of particles arising during ionization at the collector is limited only by the time of movement of these particles from the place of origin to the collector, which allows continuous control of fast-alternating, 1x beams with a specified time delay. In addition, the absence of a high voltage alternating voltage generator greatly simplifies the implementation of the proposed method.

Claims (2)

1. A method of measuring the transverse distribution of charges in beams of charged particles, based on the ionization of the residual gas by the beam under investigation, according to which the particles formed during the ionization process extract an electric field, the intensity of which exceeds the intensity of the own field of the beam, and register and on the distribution of charges in the beam under study, by the coordinate perpendicular to the direction of extraction, judged by the distribution in this direction of the particles formed during the ionization, characterized in that increasing the speed of the method and simplifying its implementation, the particles formed during ionization after extraction form a ribbon beam, the surface of which is perpendicular to the axis of the beam under study, and then a constant electric field perpendicular to the forming surface of the ribbon beam, it is deflected by coordinate a sensitive collector, on which a two-dimensional distribution of particles formed during ionization is recorded, the thickness of the ribbon beam being formed to be equal to or less than the required value of pr Spatial resolution, and the field deflecting intensity and its length are selected depending on the intensity of the extracting field, so that the size of the distribution of particles formed during ionization on the collector in both directions of measurement is the same scale. 2. A method according to claim 1, characterized in that the formation of the ribbon beam is accomplished by passing the extracted particles through the forming gap. li, i z 1 ///// i V // /// i / Рig.2