17–22 May 2026
C.I.D
Europe/Zurich timezone

Benchmarking the linear lattice of the ISIS RCS as a foundation for future model-based optimisation

WEP5058
20 May 2026, 16:00
2h
C.I.D

C.I.D

Deauville, France
Poster Presentation MC5.D01: Beam Optics Lattices, Correction Schemes, Transport Poster session

Speaker

Haroon Rafique (ISIS Neutron and Muon Source)

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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Author

Haroon Rafique (ISIS Neutron and Muon Source)

Co-authors

Prof. Adrian Oeftiger (University of Oxford) Billy Kyle (ISIS Neutron and Muon Source) Carl Jolly (Science and Technology Facilities Council) Chris Rogers (Science and Technology Facilities Council) Christopher Warsop (ISIS Neutron and Muon Source) David Kelliher (Science and Technology Facilities Council) David Posthuma de Boer (ISIS Neutron and Muon Source) Dean Adams (Science and Technology Facilities Council) ESMAEIL AHMADI (ISIS Neutron and Muon Source) Hayley Cavanagh (ISIS Neutron and Muon Source) Dr Jean-Baptiste Lagrange (Science and Technology Facilities Council) Dr John Thompson (Science and Technology Facilities Council) Mr Joshua Appleby (Science and Technology Facilities Council) Rob Williamson (ISIS Neutron and Muon Source) Mr Robert Simpson (University of Oxford) Sara Karbassi (ISIS Neutron and Muon Source) Shinji Machida (Science and Technology Facilities Council)

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