HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

Measurements of Linear Resonances and Stopbands on the ISIS Ring

THPT42

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGA:Beam Dynamics in Rings THPT poster session

Speaker

ESMAEIL AHMADI (Science and Technology Facilities Council)

Description

ISIS is the pulsed muon and neutron source at RAL in the UK. Its operation centres on an 800 MeV RCS cycling at 50 Hz and providing up to 3E13 protons per pulse corresponding to 0.2 MW mean beam power to the user targets.
Work is presently underway to improve the measurement, modelling, and control of the ISIS ring beam dynamics in order optimise operational setup as well as allow benchmarking of beam loss studies for the ISIS II upgrade.
As part of this work, new measurements of linear stopbands are being established. This paper outlines measurement of half integer stopbands exploiting low intensity, coasting beams and measurements of beam loss and profiles as tunes are ramped through resonance. Measurements are tested against applied, known, driving terms and compared with PyORBIT simulations. Initial results looking at integer stopbands and extending work to high intensity half integer resonance are also outlined.