Abstract
We developed a wideband RF cavity beam position monitor (CBPM) with a 217MHz bandwidth centered at the 4.875GHz dipole mode frequency as part of the preliminary research for a high-repetition-rate hard x-ray free electron laser project at the Chinese Academy of Engineering Physics. This paper presents new results demonstrating bunch-by-bunch position measurements on electron bunches spaced by 2.3ns (4 bunches per train). Over a measurement range of ∼100μm, this wideband CBPM achieved a spatial resolution of 0.8μm at a bunch charge of 80 pC. Position and tilt variations between bunches on the order of 10μm and 10 μrad, respectively, were clearly resolved. This high spatial and temporal resolution provides a valuable tool for experimental studies on long-range wakefield effects in multi-bunch operational light sources.
Published Version
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