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The ISIS Neutron and Muon Source at the Rutherford Appleton Laboratory, UK, uses a rapid cycling synchrotron to accelerate a beam of protons from 70 MeV to 800 MeV before delivering the beam to two spallation targets. Within the ring of the ISIS synchrotron, beam losses tend to be higher near the kicker magnets and the start of proton extraction beamlines. The increased levels of beam loss induce more radioactivity in surrounding structures of the synchrotron, which has safety implications for personnel performing maintenance work in the vicinity. Thus, it is crucial to monitor loss levels in the beam loss monitors (BLMs) local to the extraction area. A separate “trip”, i.e. a signal to stop the beam, is needed for that part of the ring. The Extract Trip Unit generates trips on the condition that losses are too high at extraction in the ring, in both a spatial (i.e. the specific ionisation chamber BLM local to the area of extraction) and temporal sense (part of the ISIS acceleration cycle during which the beam is extracted). The previous version of the Extract Trip Unit was inoperative, with obsolete components. As part of the ISIS Diagnostics obsolescence initiative, the purpose of this project was to redesign the obsolete unit and reintegrate a new Extract Trip Unit into the system. This work illustrates the process of modernising and re-deploying the Extract Trip Unit, including the updated design considerations and the step-by-step breakdown of its functions.
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