Speaker
Description
We are constructing the beam diagnostic system for SPring-8-II, a low-emittance upgrade of the SPring-8 synchrotron radiation facility. To achieve higher brilliance and coherence, SPring-8-II requires stringent beam stability, necessitating high-precision monitoring of parameters such as the beam orbit, stored current, beam size, and betatron tune. Transverse and longitudinal bunch-by-bunch feedback (BBF) systems are also necessary to suppress collective beam instabilities. Furthermore, a vertical beam shaker and several scrapers are required to stretch the beam size and safely dump the beam without damaging vacuum components. The vertical shaker is also utilized for cleaning satellite electrons in nominally empty buckets. The beam orbit is monitored using 340 button-type BPMs with MTCA.4-based readout electronics, which provide sub-μm resolution at a 10 kHz sampling rate. The beam current is precisely measured by two DCCTs, and the beam size is measured by an X-ray pinhole camera with a few-μm resolution. The transverse BBF system consists of stripline pickups, RFSoC-based feedback processors, and stripline kickers powered by wideband amplifiers, achieving a damping time shorter than 0.1 ms. It also features an integrated betatron tune measurement function, and an energy kicker is prepared for the longitudinal BBF. In this presentation, we will report on the design, performance, and construction status of these beam instrumentation and diagnostic devices for SPring-8-II.
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