Development of Ultra High Gradient and High Q{sub 0} Superconducting Radio Frequency Cavities

Conference · Sat Jun 01 00:00:00 EDT 2013

OSTI ID:1089423

Geng, Rongli ^[1]; Clemens, William A. ^[1]; Follkie, James E. ^[1]; Harris, Teena M. ^[1]; Kushnick, Peter W. ^[1]; Machie, Danny ^[1]; Martin, Robert E. ^[1]; Palczewski, Ari D. ^[1]; Perry, Era A. ^[1]; Slack, Gary L. ^[1]; Williams, R. S. ^[1]; Adolphsen, C. ^[2]; Li, Z. ^[2]; Hao, J. K. ^[3]; Li, Y. M. ^[3]; Liu, K. X. ^[3]

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1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
2. SLAC, Menlo Park, California, (United States)
3. Peking University, Beijing (China)

We report on the recent progress at Jefferson Lab in developing ultra high gradient and high Q{sub 0} superconducting radio frequency (SRF) cavities for future SRF based machines. A new 1300 MHz 9-cell prototype cavity is being fabricated. This cavity has an optimized shape in terms of the ratio of the peak surface field (both magnetic and electric) to the acceleration gradient, hence the name low surface field (LSF) shape. The goal of the effort is to demonstrate an acceleration gradient of 50 MV/m with Q{sub 0} of 10{sup 10} at 2 K in a 9-cell SRF cavity. Fine-grain niobium material is used. Conventional forming, machining and electron beam welding method are used for cavity fabrication. New techniques are adopted to ensure repeatable, accurate and inexpensive fabrication of components and the full assembly. The completed cavity is to be first mechanically polished to a mirror-finish, a newly acquired in-house capability at JLab, followed by the proven ILC-style processing recipe established already at JLab. In parallel, new single-cell cavities made from large-grain niobium material are made to further advance the cavity treatment and processing procedures, aiming for the demonstration of an acceleration gradient of 50 MV/m with Q{sub 0} of 2-10{sup 10} at 2K.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1089423
• Report Number(s): JLAB-ACC-13-1730; DOE/OR/23177-2667; TRN: US1300317
• Resource Relation: Conference: IPAC 2013 (International Particle Accelerator Conference), Shanghai (China), 12-17 May 2013
• Country of Publication: United States
• Language: English

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43 PARTICLE ACCELERATORS