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Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications

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arxiv 2102.06168 v1 pith:54L6WTRC submitted 2021-02-11 astro-ph.IM physics.ins-det

Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications

Nathan Saffold , Field Rogers , Mengjiao Xiao , Radhika Bhatt , Tyler Erjavec , Hideyuki Fuke , Charles J. Hailey , Masayoshi Kozai
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Derik Kraych Evan Martinez Cianci Melo-Carrillo Kerstin Perez Chelsea Rodriguez Yuki Shimizu Brian Smallshaw
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classification astro-ph.IM physics.ins-det
keywords detectorspassivationtemperaturesabovecoatingscryogenicexperimentform
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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 $\lesssim\,4$ keV energy resolution (FWHM) for 20$-$100 keV X-rays while operating at temperatures of $-$35 to $-45\,^{\circ}$C. This is the first reported successful passivation of Si(Li)-based X-ray detectors operated above cryogenic temperatures.

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  1. The General Antiparticle Spectrometer (GAPS) Antarctic Balloon Payload

    astro-ph.IM 2026-04 unverdicted novelty 5.0

    GAPS has constructed and launched a stratospheric balloon spectrometer that uses silicon trackers and TOF detectors to identify low-energy antiprotons, antideuterons, and antihelium via exotic-atom formation and annih...