Speaker
Description
ISIS is the short-pulsed spallation neutron and muon source at the Rutherford Appleton Laboratory in the UK. Its rapid-cycling synchrotron accelerates up to 3e13 protons per pulse from 70 to 800 MeV at 50 Hz, delivering them to fixed targets for neutron and muon production. As a beam-loss limited facility, increasing operational intensity necessitates the reduction of beam losses. Although largely mitigated, a coherent vertical instability continues to drive losses at high intensities and remains an active area of research.
Having recently identified a likely source of the instability's driving impedance, we re-examine observations of instabilities on ISIS when operating as a storage ring at its injection energy. We present the updated vertical driving impedance model, compute analytical predictions of instability growth rates excluding space-charge effects with the PyTMCI Vlasov solver, and compare these with experimental observations across a range of vertical tune settings. We also outline future development plans.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
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