Speaker
Description
Accurate Beam-Position Monitor (BPM) calibration is essential for high-quality optics measurements and reliable beam-based diagnostics in the Large Hadron Collider. Recent in-depth analyses combining advanced optics-measurement techniques, including measurements of a novel $60^{\circ}$ optics, with cross-checks from complementary beam instrumentation have revealed the presence of a previously unnoticed systematic calibration bias of approximately 3\,\% in arc BPMs. This correction has been implemented at the start of 2025, leading to improved consistency. Despite these improvements, not all aspects of the discrepancy have yet been fully understood. This contribution presents the investigations that enabled the identification of the bias, open questions, and implications for future operation.
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