Speaker
Description
Beam-based measurements of the thermal sensitivity of beam position monitor (BPM) electronics were performed in SPEAR a third-generation storage ring after more than twenty years of routine user operations. Controlled building-temperature excursions were applied to two equipment buildings containing key BPM front-end and digitiser racks. Using orbit- and charge-normalised BPM signals and independent temperature logging, we performed lag-aware regression to estimate effective position-versus-temperature coefficients for each BPM, and compared several alternative temperature-driver models (global, per-building and hybrid). The method was applied to two measurement campaigns, months apart, with different ambient conditions. The results show clearly distinguishable building-level responses and reproducible patterns within subsets of BPMs, but also highlight strong correlations between temperature, beam conditions and slowly varying lattice effects. We present this analysis framework as a step towards robust, beam-based thermal characterisation of ageing BPM systems, and outline how extended datasets could support future BPM upgrades, thermal monitoring and operational orbit-stability tools.
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