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Accelerated Lifetime Test of The SRF Dressed Cavity/Tuner System for LCLS II HE Project

The off-frequency detune method is being considered for application in the LCLS-II-HE superconducting linac to produce multi-energy electron beams for supporting multiple undulator lines simultaneously [1]. Design of the tuner has been changed to deliver roughly 3 times larger frequency tuning range. Working requirements for off-frequency operation (OFO) state that cavities be tuned at least twice a month. This specification requires the in-crease of the tuner longevity by 20 times compared with LCLS-II demands. Accelerated longevity tests of the LCLS-II HE dressed cavity with tuner were conducted at FNAL's HTS. Detail analysis of wearing and impacts on performances of the tuner's piezo and stepper motor actuators will be presented. Additionally, results of longevity testing of the dressed cavity bellow, when cooled down to 2 K and compressed by 2.6 mm for roughly 2000 cycles, will be presented.

preprint2022arXivOpen access
Y. PischalnikovT. ArkanC. Contreras-MartinezB. HartsellJ. KaluznyR. PilipenkoJ. C. YunW. Lahmadi
physics.acc-ph
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Y. PischalnikovT. ArkanC. Contreras-MartinezB. HartsellJ. KaluznyR. PilipenkoJ. C. YunW. Lahmadi

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