Speaker
Description
Modern photomultipliers (PMs) are affordable, highly sensitive, easy to operate, compact, and sufficiently robust for demanding accelerator environments. In systems such as the Linear IFMIF Prototype Accelerator (LIPAc) in Rokkasho, Japan, whose radiofrequency (RF) subsystem delivers over 2 MW of RF power distributed among all the accelerating cavities, these characteristics make PMs particularly effective for monitoring components prone to multipacting and micro-discharge. The light produced by these phenomena is detected even at very low levels, enabling detailed investigation and fast triggering of interlocks to prevent damage. At LIPAc, the superconducting RF (SRF) accelerator currently being commissioned is fully equipped with PMs. PMs have also been successfully used in a temporary test bench* and in lightweight setups to assess the attenuation of aging optical fibers. Finally, prospects for upgrading the existing RF quadrupole (RFQ) arc detector will be presented.
Footnotes
*L. Gonzalez-Gallego et al., ”Performance on high-power test bench of RF couplers for the LIPAc’s RFQ”, Proceedings of IPAC’25, Taipei, 2025
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