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

Conference ·
OSTI ID:1089423
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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)
+ Show Author Affiliations
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, Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC) (United States)
DOE Contract Number:
AC05-06OR23177
OSTI ID:
1089423
Report Number(s):
JLAB-ACC--13-1730; DOE/OR/23177-2667
Country of Publication:
United States
Language:
English

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43 PARTICLE ACCELERATORS