Speaker
Description
The ISIS Neutron and Muon source produces pulsed neutrons and muons for multi-disciplinary scattering and spectrometry experiments. Up to 3e13 protons per pulse are accumulated over a ~200 µs injection period, then accelerated from 70 to 800 MeV in the 50 Hz rapid cycling synchrotron. This beam is then extracted to one of two spallation neutron targets.
An electrostatic chopper is installed in the transfer line between the injector linac and the synchrotron, which allows injection of beam pulses between 100 ns - 5 µs, filling a fraction of the machine acceptance of the synchrotron. Beam Position Monitor (BPM) measurements of chopped beams are routinely used to determine synchrotron lattice parameters.
As part of ongoing improvements to measurement, modelling and control of ISIS beam dynamics, a new tool has been developed to routinely use these BPM signals to generate phase space ellipses. Preliminary results from commissioning of this tool are presented, showing good agreement with the linear transverse model of the ISIS RCS.
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