Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 209, Issue 5-6, Pages 1063-1069Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-022-02825-6
Keywords
Superconducting tunnel junctions; Detector uniformity
Categories
Funding
- LLNL LDRD grant [20-LW-006]
- U.S. Department of Energy (DOE) Office of Science [DE-SC0021245, DE-FG02-93ER4078]
- DOE SBIR [DE-SC0006214, DE-SC0002256]
- DOE NNSA Office of International Nuclear Safeguards [NA-241]
- DOE by LLNL [DE-AC52-07NA27344]
- U.S. Department of Energy (DOE) [DE-SC0006214, DE-SC0021245] Funding Source: U.S. Department of Energy (DOE)
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The small dimensions of superconducting tunnel junction (STJ) radiation detectors have led to the development of STJ arrays to improve detection efficiency and statistical accuracy. This study uses pulsed UV lasers and X-rays to characterize and understand non-uniformities in the response of different pixels in Ta-based STJ arrays. The research also discusses the magnitude and sources of non-uniformity, as well as approaches to reduce it.
The small dimensions of superconducting tunnel junction (STJ) radiation detectors have motivated the development of STJ arrays to increase detection efficiency and statistical accuracy. We have used a pulsed UV laser and X-rays to characterize and understand non-uniformities in the response of different pixels in Ta-based STJ arrays. To separate the contributions of the detector and the readout electronics, we have also injected the pulses from an arbitrary waveform generator into the array's amplifier chain. We discuss the magnitude and the sources of the non-uniformity and approaches to reduce it.
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