Speaker
Description
The ISIS rapid-cycling synchrotron accelerates a high-intensity
beam of protons from 70 MeV to 800 MeV at 50 Hz,
facilitated by ferrite-loaded RF cavities at harmonics ℎ = 2
and ℎ = 4. The extracted proton beam is delivered along
separate transfer lines to two tungsten spallation neutron targets,
TS1 and TS2, at rates of 40 Hz and 10 Hz respectively.
An intermediate carbon target on the TS1 line exploits ∼ 4%
of the full TS1 beam intensity for muon production.
Compression of the extracted proton pulse helps to provide
good temporal resolution for muon spin spectroscopy,
speeding up measurements and widening the range of possible
experiments. A bunch rotation method has been successfully
employed at ISIS for several years, though it is
sensitive to variations in extraction timing.
A new method using the phase offset between the fundamental
and 2nd harmonics of the ISIS ring RF has been
developed as an alternative compression method without
the same timing sensitivity. This work presents both compression
approaches with experimental data, tomographic
reconstructions, and supporting longitudinal beam dynamics
simulations.
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