Multipacting Processing in Cryomodules For LCLS-II And LCLS-II-HE

Conference · Thu Jun 29 00:00:00 EDT 2023

OSTI ID:1988444

Cravatta, A.  ^[1]; Arkan, T. ^[1]; Bafia, D. ^[1]; Kaluzny, J. ^[1]; Posen, S. ^[1]; Vennekate, J. ^[2]; Drury, M. ^[2]; Aderhold, S. ^[3]; Checchin, M. ^[3]; Gonnella, D. ^[3]; Hogan, J. ^[3]; Maniscalco, J. ^[3]; Nelson, J. ^[3]; Porter, R. ^[3]; Zacarias, L. ^[3]

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1. Fermilab
2. Jefferson Lab
3. SLAC

Multipacting (MP) is a phenomenon which can affect stability in particle accelerators and limit performance in superconducting radio frequency cavities. In the TESLA shaped, 1.3 GHz, 9-cell cavities used in the LCLS-II (L2) and LCLS-II-HE (HE) projects, the MP-band (~17-24 MV/m) lies within the required accelerating gradients. For HE, the operating gradient of 20.8 MV/m lies well within the MP-band and cryomodule testing has confirmed that this is an issue. As such, MP processing for the HE cryomodule test program will be discussed. Early results on MP processing in cryomodules installed in the L2 linac will also be presented, demonstrating that the methods used in cryomodule acceptance testing are also successful at conditioning MP in the accelerator and that this processing is preserved in the mid-term.

• 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)
• Contributing Organization: LCLS-II
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1988444
• Report Number(s): FERMILAB-CONF-23-316-TD; arXiv:2306.17274; oai:inspirehep.net:2673702
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS