LCLS-II and HE Cryomodule Microphonics at CMTF in Fermilab*
C. Contreras-Martinez, E. Harms, C. Cravatta, J. Holzbauer, S. Posen,, L. Doolittle, B. Chase, J. Einstein-Curtis, J. Makara, R. Wang
TL;DR
This study analyzes microphonics-induced detuning in sixteen 1.3 GHz cryomodules tested at Fermilab's CMTF, providing detailed measurements of peak and RMS detuning to inform future cryomodule design and operation.
Contribution
It offers comprehensive microphonics data for LCLS-II and LCLS-II HE cryomodules, highlighting detuning characteristics with long-duration, high-resolution measurements.
Findings
Peak detuning values characterized for each cryomodule
RMS detuning levels measured with thermalization considerations
Data supports improved microphonics mitigation strategies
Abstract
Microphonics causes the cavity to detune. This study discusses the microphonics of sixteen 1.3 GHz cryomodules, 14 for LCLS-II and 2 for LCLS-II HE tested at CMTF. The peak detuning, as well as the RMS detuning for each cryomodule, will be discussed. For each cryomodule, the data was taken with enough soaking time to prevent any thermalization effects which can show up in the detuning. Each data capture taken was 30 minutes or longer and sampled at 1 kHz.
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Taxonomy
TopicsSuperconducting Materials and Applications · Particle accelerators and beam dynamics