Proton radiation damage and annealing of COSI p-type cross-strip HPGe detectors
Year: 2025
Type: article
Abstract: In order to understand the effects of a space radiation environment on cross-strip germanium detectors, we investigated the effects of high-energy proton damage on a COSI detector and the capabilities of high-temperature annealing in repairing detector spectral resolution. We irradiated a COSI-balloon cross-strip high-purity germanium (HPGe) detector with 150 MeV protons resulting in a net fluence of 4 . 95 × 1 0 8 p + /cm 2 and corresponding to ∼ 10 years in COSI’s space radiation environment. We repaired the resulting degradation in spectral resolution through a series of high-temperature anneals to obtain a final FWHM of 4.08 keV, within 37 % of its preradiation value (2.98 keV FWHM). We characterized the repair of charge traps with time spent under high-temperature anneal to inform an annealing procedure for long-term maintenance of COSI’s spectral resolution.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,620
Funders: U.S. Department of Energy, National Aeronautics and Space Administration, Loma Linda University, Nuclear Safety and Security Commission, Goddard Space Flight Center, Laboratory Directed Research and Development, Astrophysics Science Division, Astrophysics Division, Lawrence Berkeley National Laboratory
OpenAlex ID: W4409906790