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Title: Low temperature laser scanning microscopy of a superconducting radio-frequency cavity

An apparatus was created to obtain, for the first time, 2D maps of the surface resistance of the inner surface of an operating superconducting radio-frequency niobium cavity by a low-temperature laser scanning microscopy technique. This allows identifying non-uniformities of the surface resistance with a spatial resolution of about one order of magnitude better than with earlier methods. A signal-to-noise ratio of about 10 dB was obtained with 240 mW laser power and 1 Hz modulation frequency. The various components of the apparatus, the experimental procedure and results are discussed in details in this contribution.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. ASTiGMAT, Sacramento, CA (United States)
Publication Date:
OSTI Identifier:
1039900
Report Number(s):
JLAB-ACC--12-1491; DOE/OR/23177--1989
Journal ID: ISSN 0034-6748; RSINAK; TRN: US201210%%101
Grant/Contract Number:
AC05-06OR23177; PS02-09ER0905; SC0004950
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 3; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; LASERS; MICROSCOPY; MODULATION; NIOBIUM; SIGNAL-TO-NOISE RATIO; SPATIAL RESOLUTION surface finishing; laser resonators; laser beams; niobium; cavitation