Bunch-by-bunch (BbB) technique, which allows accelerator
physicists to monitor beam information on finer timescales, is an
efficient tool for studying longitudinal and transverse beam
dynamics. However, the real-time measurement in BbB technique can
only monitor one beam parameter, thus focusing only on the
longitudinal phase or transverse positions of bunches. Therefore, to
solve this issue, we put forward a one-time sampling method (OSM) to
evaluate the longitudinal phase and transverse positions of bunches
simultaneously, taking as one way of the real-time measurement for
BbB three-dimensional (3D) positions. And we carried out related
experiments in Hefei Light Source II and Shanghai Synchrotron
Radiation Facility. As a result, experiments show that OSM obtains
12 μm of x-direction resolution, 10 μm of
y-direction resolution, 0.57 ps of z-direction resolution at
Hefei Light Source II, and 10 μm of x-direction resolution,
10 μm of y-direction resolution, 0.35 ps of z-direction
resolution at Shanghai Synchrotron Radiation Facility. All these
experimental results reveal that OSM is feasible to measure the BbB
3D positions.
Multi-dimensional bunch-by-bunch (BbB) measurements are an efficient tool to research beam dynamics induced by wakefields in storage ring light sources, yet they can have data misplacement problems on high-speed acquisition boards. Hence, a data synchronization module (DSM) was designed to solve the issue of data misplacement. We analyzed different synchronization states in the DSM and conducted testing of the DSM on a field programmable gate array to evaluate its performance. Test results indicate the synchronized DSM data from multiple high-speed acquisition boards corresponds to the bucket number in the bunch filling pattern. We found that the resolution of the longitudinal phase in three-dimensional BbB measurements can be improved with DSM and propose a scheme for multi-dimensional BbB measurements. In this paper, we will detail the structure of DSM and its limitations.
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