Proton radiation damage and annealing of COSI p-type cross-strip HPGe detectors
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.
Authors
- John A. Tomsick (ORCID: https://orcid.org/0000-0001-5506-9855)
- Steven E. Boggs (ORCID: https://orcid.org/0000-0001-9567-4224)
- Joanna M. Szornel (ORCID: https://orcid.org/0009-0002-1776-5475)
- Sean N. Pike (ORCID: https://orcid.org/0000-0002-8403-0041)
- Albert Y. Shih (ORCID: https://orcid.org/0000-0001-6874-2594)
- Andreas Zoglauer (ORCID: https://orcid.org/0000-0001-9067-3150)
- Gabriel Brewster
- Jarred Roberts (ORCID: https://orcid.org/0000-0002-7660-2740)
- Anaya Valluvan
- Sophia E. Haight
Institutions
- Goddard Space Flight Center (US)
- Lawrence Berkeley National Laboratory (US)
- University of California San Diego (US)
- University of California, Berkeley (US)
Publication Details
- Journal
- Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
- Published
- 2025-04-29
- DOI
- https://doi.org/10.1016/j.nima.2025.170538
- Citations
- 1
- Primary Topic
- Particle Detector Development and Performance
- Type
- article
- Field-Weighted Citation Impact
- 1.87
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