Bunch-by-bunch three-dimensional position measurement system and measurement method

Abstract

The invention relates to a bunch-by-bunch three-dimensional position measurement system which comprises a plurality of button type beam position probes, each beam position probe is connected with a split-phase sampling circuit through a coaxial cable, the split-phase sampling circuit is electrically connected with a data acquisition system, and the data acquisition system is electrically connected with a timing system. According to the bunch-by-bunch three-dimensional position measurement system, the measurement time is saved, and the data consistency is ensured. The invention further relates to a bunch-by-bunch three-dimensional position measurement method, the split-phase sampling technology is adopted, signal amplitude and phase information are obtained by establishing a lookup table for mode matching, measurement errors caused by linear fitting are avoided, influences caused by clock jitter and phase oscillation are effectively removed, and the precision of extracting the three-dimensional position information of the bunch-by-bunch group is improved.

Description

technical field [0001] The invention relates to a particle accelerator physical beam diagnosis technology, in particular to a beam-by-beam three-dimensional position measurement system and a measurement method. Background technique [0002] For multi-electrode beam position detectors, the figure 1 The button-type beam position detector (probe) (BPM) with four electrodes A, B, C, and D on the electron storage ring shown is taken as an example, in order to obtain three-dimensional position information (lateral position, Longitudinal phase), the current measurement method is to first process the signals output by the four electrodes separately, and then use the data acquisition board to sample. Specifically, the measurement principle as figure 2 As shown, a set of horizontal position acquisition system is set up first, and the peak points of the four electrode signals are respectively obtained by using the peak detection technology, and the position information is extracted ...

AI Technical Summary

Problems solved by technology

[0005] The signal sampling points of the above two systems need to be controlled by the external clock of the acquisition system. In the lateral position system, it is necessary to ensure that the sampling point of each electrode signal is located at the peak point, but the jitter of the external clock and the oscillation of the bunch phase will both The offset of the peak point sampling, resulting in measurement error

In the longitudinal phase system, it is necessary to ensure that the two sampling points with a fixed phase difference (T) are located in the linear region of the rising edge of the signal, but the jitter of the external clock will also cause the phase shift of the sampling points, resulting in measurement errors

Moreover, since the induced voltage signal obtained by each electrode is a sinusoidal signal, and the zero-crossing point of the sinusoidal signal is approximately linear rather than a normal linear relationship, so there is a deviation in the phase of the zero-crossing point obtained by fitting

In addition, this measurement method needs to use more experimental instruments, and has high requirements for simultaneous sampling of the three-dimensional position measurement of each cluster

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