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Title: New results of development on high efficiency high gradient superconducting rf cavities

We report on the latest results of development on high-efficiency high-gradient superconducting radio frequency (SRF) cavities. Several 1-cell cavities made of large-grain niobium (Nb) were built, processed and tested. Two of these cavities are of the Low Surface Field (LSF) shape. Series of tests were carried out following controlled thermal cycling. Experiments toward zero-field cooling were carried out. The best experimentally achieved results are Eacc = 41 MV/m at Q0 = 6.5×1010 at 1.4 K by a 1-cell 1.3 GHz large-grain Nb TTF shape cavity and Eacc = 49 MV/m at Q0 = 1.5×1010 at 1.8 K by a 1-cell 1.5 GHz large-grain Nb CEBAF upgrade low-loss shape cavity.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [2]
  1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Peking Univ., Beijing (China)
  4. OTIC, Ningxia (China)
Publication Date:
OSTI Identifier:
1223452
Report Number(s):
JLAB-ACC--15-2075; DOE/OR/23177--3432
TRN: US1601428
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
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
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SUPERCONDUCTING CAVITY RESONATORS; GHZ RANGE 01-100; TEMPERATURE RANGE 0000-0013 K; NIOBIUM; EFFICIENCY; SHAPE; THERMAL CYCLING; COOLING; QUALITY FACTOR