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Title: Nitrogen doping study in ingot niobium cavities

Thermal diffusion of nitrogen in niobium superconducting radio frequency cavities at temperature ~800 °C has resulted in the increase in quality factor with a low-field Q-rise extending to Bp > 90 mT. However, the maximum accelerating gradient of these doped cavities often deteriorates below the values achieved by standard treatments prior to doping. Here, we present the results of the measurements on ingot niobium cavities doped with nitrogen at 800 °C. The rf measurements were carried out after the successive electropolishing to remove small amount of material from the inner surface layer. The result showed higher breakdown field with lower quality factor as material removal increases.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
OSTI Identifier:
1223450
Report Number(s):
JLAB-ACC--15-2036; DOE/OR/23177--3390
TRN: US1601427
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; NIOBIUM; NITROGEN; SUPERCONDUCTING CAVITY RESONATORS; DOPED MATERIALS; QUALITY FACTOR; ELECTROPOLISHING; THERMAL DIFFUSION; BREAKDOWN; TEMPERATURE RANGE 1000-4000 K