Fabrication of Gamma Detectors Based on Magnetic Ag:Er Microcalorimeters

Friedrich, Stephan¹  Boyd, Stephen²  Cantor, Robin³ 

[1] Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States);Univ. of New Mexico, Albuquerque, NM (United States);STAR Cryoelectronics, Santa Fe, NM (United States)

关键词: 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;   

DOI  :  10.2172/1259772
RP-ID  :  LLNL--TR-679717
PID  :  OSTI ID: 1259772
Others  :  TRN: US1601532

美国|英语

来源: SciTech Connect

【 摘 要 】

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.