Speaker
Description
TPS is a third-generation synchrotron (circumference 518.4 m; 24 DBA cells; revolution time ≈ 1.732 µs/turn). Our approach first excites betatron motion with a fast kicker of pinger magnet, then applies ICA to TbT data from all BPMs to isolate the two coupled betatron normal modes and extract, at each BPM, the modal amplitudes and phase advances of their projections on the horizontal and vertical planes, and betatron tunes. These measured features form a robust objective vector (heavily phase-weighted to reduce calibration sensitivity) for a constrained fit of a TPS lattice model. The resulting Jacobian (derivatives of features w.r.t. quadrupole and skew-quadrupole strengths, and selected BPM calibration parameters) defines an aggregated response matrix that we invert by SVD to compute correction knobs. Our formulation is consistent with the coupled-lattice normal-mode theory of Sagan & Rubin and with practical ICA-based optics/coupling fitting demonstrated at modern light sources. Compared with orbit-response–only LOCO workflows, TbT-ICA offers competitive or superior statistics because hundreds to thousands of turns contribute per fill while ICA suppresses BPM noise and unrelated processes; we therefore find TbT-ICA an attractive complement to LOCO at TPS, especially for rapid, minimally invasive re-characterization and for continuous optics health monitoring.
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