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Description
The commissioning of the next-generation Swiss Light Source, SLS 2.0, at the Paul Scherrer Institut (PSI) required advanced diagnostic tools. Built on established Avalanche Photodiode-based (APD) fill pattern monitoring principles used in previous storage ring diagnostic systems, we present an upgraded Filling Pattern Monitor (FPM) designed specifically for real-time evaluation of the SLS 2.0 fill pattern. The bunch frequency is ~500 MHz, and the APD produces pulses in the order of 300 ps. The FPM is built around CompactPCI-Serial hardware and a commercial ADC FMC board. The ADC samples the signal from the APD with a time-interleaved sampling rate of ~96 GSPS, providing 192 samples per bucket resolution. The system processes the waveform in real time to calculate the bucket charge distribution for the entire SLS storage ring at a frequency of 3 Hz. The fill pattern is derived using four distinct methods. While each method can independently calculate the charge distribution, this implementation employs a hybrid approach, integrating selected method outputs at different stages of the data processing pipeline. Synchronized with the machine timing system, the FPM outputs measured fill pattern data at a latency of <40 ms relative to the selected trigger. These data can be used directly by downstream systems such as the Fill Pattern Feedback (FPFB)** as needed.
Footnotes
- C. Ozkan Loch et al., doi:10.18429/JACoW-IBIC2025-MOPMO04
** R. Rybaniec et al., doi:10.18429/JACoW-IPAC2024-THPG24
*** P. Baeta Neves Diniz Santos et al., doi:10.18429/JACoW-IBIC2025-MOPCO12
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