Speaker
Description
ISIS operates an 800 MeV Rapid Cycling Synchrotron (RCS) delivering protons to neutron and muon targets with a beam power of 0.2 MW. A reliable lattice description is essential for advancing low-loss, high-intensity operation and supports emerging model-driven optimisation enabled by forthcoming Python-accessible controls. A new consolidated low-intensity linear optics model of the ISIS RCS, developed through a continuous programme of systematic measurement-based benchmarking, is presented.
Using enhanced analysis of low-intensity turn-by-turn BPM data, multiple optics measurements have been integrated into a single self-consistent lattice representation. This lattice represents a significant advance over earlier design-only or partially benchmarked descriptions, enabling clearer identification of optics discrepancies and guiding targeted correction measures, including improvements to magnet survey and alignment.
The resulting reference lattice, implemented in MAD-X/cpymad and cross-checked with PTC-PyORBIT, reproduces low-intensity optics with improved predictive performance, particularly for orbit response and optics control. Benchmarks of the consolidated model, resulting improvements, and planned implementation in model-based optimisation of ISIS RCS operation are presented.
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