Speaker
Description
SuperKEKB is an electron–positron collider that aims to exceed its own world-record instantaneous luminosity by an order of magnitude. During high-current collision operation, various beam instabilities—such as sudden beam loss, electron-cloud effects, and fast-ion instability—can limit beam performance and stable machine operation. To better understand these phenomena, fast diagnostic systems capable of resolving the behavior of individual bunches within a bunch train are essential. To address this need, we have developed a new bunch-by-bunch X-ray beam size monitor. Synchrotron radiation emitted from a bending magnet is passed through a coded-aperture optical element and imaged onto a silicon strip detector. High-speed sampling of the detector signals enables vertical beam size measurements for every bunch in the SuperKEKB main ring with a temporal spacing of approximately 4 ns. This presentation reports an overview of the monitor development, results from initial performance testing and commissioning, and the first beam observations obtained using this diagnostic system.
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