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Title: Observation of Stable Low Surface Resistance in Large-Grain Niobium SRF Cavities

Low surface resistance, or high unloaded quality factor (Q0), superconducting radio frequency (SRF) cavities are being pursued actively nowadays as their application in large-scale CW SRF accelerators can save capital and operational cost in cryogenics. There are different options in realization of such cavities. One of them is the large-grain (LG) niobium cavity. In this contribution, we present new experimental results in evaluation of LG niobium cavities cooled down in the presence of an external magnetic field. High Q0 values are achieved even with an ambient magnetic field of up to 100 mG. More over, it is observed that these high Q0 values are super-robust against repeated quench, literally not affected at all after the cavity being deliberately quenched for hundreds of times in the presence of an ambient magnetic field of up to 200 mG.
 [1] ;  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Institute of Modern Physics (IMP)/Chinese Academy of Sciences (CAS), Lanzhou (China)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-ACC-16-2298; DOE/OR/23177-3879
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: IPAC'16, 08-13 May 2016. Busan, Korea
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States