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Title: Temperature Mapping of Nitrogen-doped Niobium Superconducting Radiofrequency Cavities

It was recently shown that diffusing nitrogen on the inner surface of superconducting radiofrequency (SRF) cavities at high temperature can improve the quality factor of the niobium cavity. However, a reduction of the quench field is also typically found. To better understand the location of rf losses and quench, we used a thermometry system to map the temperature of the outer surface of ingot Nb cavities after nitrogen doping and electropolishing. Surface temperature of the cavities was recorded while increasing the rf power and also during the quenching. The results of thermal mapping showed no precursor heating on the cavities and quenching to be ignited near the equator where the surface magnetic field is maximum. Hot-spots at the equator area during multipacting were also detected by thermal mapping.
Authors:
 [1] ;  [2] ;  [2]
  1. Old Dominion Univ., Norfolk, VA (United States)
  2. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1223476
Report Number(s):
JLAB-ACC--15-2022; DOE/OR/23177--3534
TRN: US1601442
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; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; NIOBIUM; NITROGEN; SUPERCONDUCTING CAVITY RESONATORS; DOPED MATERIALS; TEMPERATURE DISTRIBUTION; SURFACES; TEMPERATURE RANGE 0000-0013 K; ELECTROPOLISHING; QUALITY FACTOR; QUENCHING; HOT SPOTS; MAGNETIC FIELDS; ENERGY LOSSES; TRANSITION TEMPERATURE