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DOE OSTI · 2279042

Microphonics in the LCLS-II Superconducting Linac

Porter, Ryan·Aderhold, Sebastian·Alsberg, Lauren·Cravatta, Andrew·Drury, Michael·Gaitan, Gabriel·Gonnella, Daniel·Holzbauer, Jeremiah·McCaughan, Michael·Nelson, Janice·Neveu, Nicole·Posen, Sam·Stilin, Neil·Wilson, Christiana·Zacarias, Lisa
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Abstract

The LCLS-II project has installed a new superconducting linac at SLAC that consists of 35 1.3 GHz cryomodules and 2 3.9 GHz cryomodules. The linac will provide a 4 GeV electron beam for generating soft and hard X-ray pulses. Cavity detuning induced by microphonics was a significant design challenge for the LCLS-II cryomodules. Cryomodules were produced that were within the detuning specification (10 Hz for 1.3 GHz cryomodules) on test stands. Here we present first measurements of the microphonics in the installed LCLS-II superconducting linac. Overall, the microphonics in the linac are manageable with 94% of cavities coming within the detune specification. Only two cavities are gradient limited due to microphonics. We identify a leaking cool down valve as the source of microphonics limiting those two cavities.

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Porter, Ryan, Aderhold, Sebastian, Alsberg, Lauren, Cravatta, Andrew, Drury, Michael, Gaitan, Gabriel, Gonnella, Daniel, Holzbauer, Jeremiah, McCaughan, Michael, Nelson, Janice, Neveu, Nicole, Posen, Sam, Stilin, Neil, Wilson, Christiana, Zacarias, Lisa. 2023-09-25. Microphonics in the LCLS-II Superconducting Linac. https://doi.org/10.18429/jacow-srf2023-mopmb081

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