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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 extracted proton beamlines due to the activity of the kicker magnets in the area. The ionising radiation from the heightened loss of beam is a hazard to the surrounding structures in the synchrotron. It is therefore 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 condition that loss is too high at extraction in the ring, in a sense of both space, (i.e., the specific ionisation chamber BLM local to the area of extraction) and time (the portion of the ISIS pulse during which the proton beam is extracted from the ring). The previous version of the Extract Trip Unit was inoperative and contained outdated components, rendering it obsolete. As part of the ISIS Diagnostics obsolescence initiative, the purpose of this project was to redesign the obsolete unit, and thus 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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