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Description
High-intensity operation of the new SIS100 synchrotron is expected to be sensitive to coupled and single-bunch instabilities *. To counter these effects, a Bunch-By-Bunch Longitudinal Feedback System is currently in development. Operating this feedback system during acceleration and for arbitrary revolution frequencies presents several challenges. Thereby, this article focuses on the timing regarding the processing of a beam current signal provided by a Fast Current Transformer. This signal is utilized as main input for the feedback system in order to detect longitudinal beam oscillations of individual bunches. Therefore, it is demultiplexed into a sequence of segments, each containing the beam current signal of a single bucket. Afterwards, those segments are processed to extract potential oscillation components. The timing of the demultiplexing is controlled via harmonic RF reference signals that must be calibrated. The functionality of this demultiplexing process has been verified through measurements during a machine experiment in July 2025.
Footnotes
- FAIR Technical Design Report SIS100, In: EDMS 1332234 v.1 (2008).
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