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Microphonics in the LCLS-II Superconducting Linac

Conference · · JACoW
 [1];  [1];  [1];  [2];  [3];  [4];  [1];  [2];  [3];  [1];  [1];  [2];  [4];  [3];  [1]
  1. SLAC
  2. Fermilab
  3. Jefferson Lab
  4. Cornell U., CLASSE
+ Show Author Affiliations
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.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
2279042
Report Number(s):
FERMILAB-CONF-23-773-PIP2-TD; oai:inspirehep.net:2723454
Conference Information:
Journal Name: JACoW Journal Volume: SRF2023
Country of Publication:
United States
Language:
English

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43 PARTICLE ACCELERATORS