Abstract
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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Acknowledgements
This research was supported by the LLNL LDRD grant 20-LW-006, the U.S. Department of Energy (DOE) Office of Science grants DE-SC0021245 and DE-FG02-93ER4078, and DOE SBIR grants DE-SC0006214 and DE-SC0002256. It was performed under appointment to the Nuclear Nonproliferation International Safeguards Fellowship Program sponsored by the DOE NNSA Office of International Nuclear Safeguards (NA-241). It was performed under the auspices of the DOE by LLNL under Contract DE-AC52-07NA27344. Data will be made available on reasonable request.
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Friedrich, S., Marino, A., Ponce, F. et al. Characterization of Non-uniformities in Superconducting Tunnel Junction Radiation Detectors. J Low Temp Phys 209, 1063–1069 (2022). https://doi.org/10.1007/s10909-022-02825-6
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DOI: https://doi.org/10.1007/s10909-022-02825-6