Integrated SQUID/Sensor Metallic Magnetic Microcalorimeter for Gamma-Ray Spectroscopy

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/S10909-018-2017-X· OSTI ID:22809849

Boyd, S. T. P.,; Hummatov, R. ^[1]; Kim, G. B. ^[2]; Le, L. N. ^[1]; Hall, J. A.; Cantor, R. ^[3]; Friedrich, S. ^[2]

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1. University of New Mexico (United States)
2. Lawrence Livermore National Laboratory (United States)
3. STAR Cryoelectronics (United States)

Metallic magnetic microcalorimeters (MMCs) achieve energy resolution comparable to transition-edge sensors (TESs) but rely on different measurement physics that may allow MMCs to surpass TESs in some future applications. We have recently completed fabrication of new MMC γ-ray detector arrays using several exploratory sensor designs. All designs integrate the SQUID and sensor on the same chip and use a superconducting cap layer on the paramagnet, but explore different combinations of combined/separate sensing and magnetization coils and direct/flux transformer coupling to the input SQUIDs. This report describes the design and initial testing of one of these devices, which has so far demonstrated an energy resolution of 38 eV at 60 keV near 10 mK using natural-abundance silver–erbium paramagnet.

• OSTI ID: 22809849
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 193; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALORIMETERS
DESIGN
ENERGY RESOLUTION
ERBIUM
FABRICATION
GAMMA SPECTROSCOPY
MAGNETIZATION
SENSORS
SILVER
SQUID DEVICES
TRANSFORMERS