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Title: Design of a Multi-Channel Ultra-High Resolution Superconducting Gamma-Ray Spectrometer

Superconducting Gamma-ray microcalorimeters operated at temperatures around {approx}0.1 K offer an order of magnitude improvement in energy resolution over conventional high-purity Germanium spectrometers. The calorimeters consist of a {approx}1 mm{sup 3} superconducting or insulating absorber and a sensitive thermistor, which are weakly coupled to a cold bath. Gamma-ray capture increases the absorber temperature in proportion to the Gamma-ray energy, this is measured by the thermistor, and both subsequently cool back down to the base temperature through the weak link. We are developing ultra-high-resolution Gamma-ray spectrometers based on Sn absorbers and superconducting Mo/Cu multilayer thermistors for nuclear non-proliferation applications. They have achieved an energy resolution between 60 and 90 eV for Gamma-rays up to 100 keV. We also build two-stage adiabatic demagnetization refrigerators for user-friendly detector operation at 0.1 K. We present recent results on the performance of single pixel Gamma-ray spectrometers, and discuss the design of a large detector array for increased sensitivity.
Authors:
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Publication Date:
OSTI Identifier:
15014718
Report Number(s):
UCRL-CONF-208296
TRN: US200807%%792
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: SPIE (The International Society for Optical Engineering) 49th Annual Meeting 2004, Denver, CO, United States, Aug 02 - Aug 06, 2004
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; ADIABATIC DEMAGNETIZATION; CALORIMETERS; DESIGN; ENERGY RESOLUTION; GERMANIUM; PERFORMANCE; PROLIFERATION; REFRIGERATORS; RESOLUTION; SENSITIVITY; SPECTROMETERS; THERMISTORS