Vacuum RF Breakdown of Accelerating Cavities in Multi-Tesla Magnetic Fields

Conference · Wed Jun 01 04:00:00 EDT 2016

DOI:https://doi.org/10.18429/JACoW-IPAC2016-MOPMW025· OSTI ID:1408333

Bowring, Daniel ^[1]; Freemire, Ben ^[2]; Kochemirovskiy, Alexey ^[3]; Lane, Peter ^[2]; Moretti, Alfred ^[1]; Palmer, Mark ^[1]; Peterson, David ^[1]; Tollestrup, Alvin ^[1]; Torun, Yagmur ^[2]; Yonehara, Katsuya ^[1]

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1. Fermilab
2. IIT, Chicago
3. Chicago U.

Ionization cooling of intense muon beams requires the operation of high-gradient, normal-conducting RF structures within multi-Tesla magnetic fields. The application of strong magnetic fields has been shown to lead to an increase in vacuum RF breakdown. This phenomenon imposes operational (i.e. gradient) limitations on cavities in ionization cooling channels, and has a bearing on the design and operation of other RF structures as well, such as photocathodes and klystrons. We present recent results from Fermilab's MuCool Test Area (MTA), in which 201 and 805 MHz cavities were operated at high power both with and without the presence of multi-Tesla magnetic fields. We present an analysis of damage due to breakdown in these cavities, as well as measurements related to dark current and their relation to a conceptual model describing breakdown phenomena.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1408333
• Report Number(s): IPAC-2016-MOPMW025; FERMILAB-CONF-16-692-AD-APC-PPD; 1469632
• Country of Publication: United States
• Language: English

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