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Title: Fabrication of Gamma Detectors Based on Magnetic Ag:Er Microcalorimeters

This report discusses the photolithographic fabrication of ultra-high resolution gamma-ray detectors based on magnetic microcalorimeters (MMCs). The MMC uses a novel Er-doped silver sensor (Ag:Er) that is expected to have higher sensitivity than the Er-doped gold (Au:Er) sensors currently in use. The MMC also integrates the first-stage SQUID preamplifier on the same chip as the MMC gamma detector to increase its signal-to-noise ratio. In addition, the MMC uses a passive Ta-Nb heat switch to replace one of the common long-term failure points in earlier detectors. This report discusses the fabrication process we have developed to implement the proposed improvements.
Authors:
 [1] ;  [2] ;  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
  3. STAR Cryoelectronics, Santa Fe, NM (United States)
Publication Date:
OSTI Identifier:
1259772
Report Number(s):
LLNL--TR-679717
TRN: US1601532
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; CALORIMETERS; DOPED MATERIALS; SQUID DEVICES; FABRICATION; GOLD; SILVER; ERBIUM; GAMMA DETECTION; SIGNAL-TO-NOISE RATIO; SENSORS; RESOLUTION; SENSITIVITY; ZEEMAN EFFECT; MAGNETIC FIELDS; TEMPERATURE RANGE 0000-0013 K