Speaker
Description
Superconducting magnets of high-energy accelerators are vulnerable to beam-induced damage; previous experiments characterized the damage limits of Nb$_3$Sn sample coils under proton-beam impact. This paper presents a follow-up experiment at CERN's HiRadMat facility investigating the combined effect of radiation ageing and beam impact on superconducting sample coils. The coils were pre-irradiated to simulate the integral dose anticipated for the HL-LHC final-focusing triplet magnets at the end of their lifetime. Following a review of the experimental motivation and preparation of the samples, the final experimental setup is described, including sample positioning and expected temperature profiles under beam impact. Metrology measurements, survey operations, and beam-based alignment, used to ensure adequate beam impact parameters, are detailed together with the proton beam parameters used to irradiate the samples. FLUKA simulations constrained by measured beam size, intensity, and position provide local temperature rises and gradients. The timeline of the successfully completed experiment is reviewed. The ongoing post-irradiation analysis, including the assessment of beam-spot characteristics using radiation-sensitive film and the critical-current measurement campaign, is discussed in detail.
Footnotes
Research supported by the HL-LHC project
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