Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications
DownloadAccepted version (14.79Mb)
Publisher with Creative Commons License
Publisher with Creative Commons License
Creative Commons Attribution
Terms of use
Metadata
Show full item recordAbstract
© 2021 Elsevier B.V. This work evaluates the viability of polyimide and parylene-C for passivation of lithium-drifted silicon (Si(Li)) detectors. The passivated Si(Li) detectors will form the particle tracker and X-ray detector of the General Antiparticle Spectrometer (GAPS) experiment, a balloon-borne experiment optimized to detect cosmic antideuterons produced in dark matter annihilations or decays. Successful passivation coatings were achieved by thermally curing polyimides, and the optimized coatings form an excellent barrier against humidity and organic contamination. The passivated Si(Li) detectors deliver ≲ 4 keV energy resolution (FWHM) for 20−100 keV X-rays while operating at temperatures of −35 to −45 °C. This is the first reported successful passivation of Si(Li)-based X-ray detectors operated above cryogenic temperatures.
Date issued
2021Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publisher
Elsevier BV
Citation
Saffold, N, Rogers, F, Xiao, M, Bhatt, R, Erjavec, T et al. 2021. "Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications." Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 997.
Version: Author's final manuscript