SU148164A1 - Indicator of the number of accelerated particles with an amplitude of betatron oscillations greater than a given - Google Patents

Description

The present invention relates to indicators of the number of particles being accelerated using indicator electrodes and the phenomenon of a change in their charge.

The proposed indicator differs from those known in that an electrostatic shield is installed between the electrode and the beam of accelerated particles, which significantly attenuates the signals induced by the beam circulating in the center of the chamber, the amplitudes of betatron oscillations of which are less than permissible.

Such an embodiment of the indicator allows a sharp increase in the sensitivity of the meter to the deviations of particles from the center of the chamber.

The indicator also applies a multiplication (coincidence) scheme, which records only the deviations of particles from the center of the chamber with the frequencies of betatron oscillations. This in turn makes it possible to eliminate the possibility of spurious signals when the center of the beam is shifted.

The drawing shows a schematic indicator.

The indicator consists of two pairs of indicator electrodes /, placed outside the working area 2 in the vacuum chamber 3 of the accelerator. The electrostatic screens 4 connected to the grounded chamber 3 are set so that the signal induced on the electrodes / is strongly attenuated or equal to zero.

As the amplitude of betatron oscillations increases, the charge induced on the electrodes increases sharply and becomes proportional to the number of particles outside the screen 4.

Induced charge, with a uniform distribution of particles over the cross section of beam 5 of unchanged intensity and constant amplitude of betatron oscillations occurring in another plane, will be proportional to the amplitude of these oscillations.

No. 148164- 2 Making the electrodes paired eliminates the supply of spurious signals from the electrodes to the multiplication circuit (coincidence) when the entire beam 5 is displaced from the center of the chamber.

In order to normalize the scale, the indicator 7 when the intensity of the beam changes and the amplitude of the betatron oscillations, signals from the intensity sensor 8 and from the sensor 9 of the betatron oscillations are used. The device for measuring vertical betatron oscillations is rotated relative to the radial oscillation meter by 90 °

The beam section 5 can be represented as an ellipse whose half axes correspond to the maximum amplitudes of the vertical and radial betatron oscillations (provided that the observation time is long, relative to the period of the betatron oscillations, but less than the synchrotron oscillations period). Information on the amplitude and frequency of the betatron oscillations, which determine the stability of the accelerator, must be continuous and obtained without disrupting the particle acceleration process.

Subject invention

Claims (2)

1. The indicator of the number of accelerated particles with an amplitude of betatron oscillations greater than a given one, based on measuring the charge induced by the beam of accelerated particles on the indicator electrodes, from the fact that, in order to sharply increase the sensitivity of the meter to the deviations of particles from the center of the chamber An electrostatic shield is installed between the electrode and the beam, which significantly attenuates the signals induced by the beam circulating in the center of the chamber, the amplitudes of betatron oscillations of which are less than permissible. 2. Indicator pop. 1, characterized in that, in order to eliminate spurious signals when the center of the beam is shifted, a multiplication (coincidence) scheme is applied, recording only deviations of particles from the center of the chamber with frequencies of betatron oscillations.