Abstract
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.
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