COSI p型交叉条HPGe探测器的质子辐射损伤与退火
Proton Radiation Damage and Annealing of COSI p-type Cross-strip HPGe Detectors
AI总结：
为了解空间辐射对交叉条锗探测器的影响，研究了高能质子损伤对COSI探测器的效应及高温退火的修复能力，通过150MeV质子辐照并经高温退火修复电荷陷阱，最终能谱分辨率达辐照前37%以内，为长期维护提供依据。
摘要：
为了解空间辐射环境对交叉条锗探测器的影响，我们研究了高能质子损伤对COSI探测器的效应以及高温退火修复探测器能谱分辨率的能力。我们用150 MeV质子辐照了一个COSI气球载交叉条高纯锗（HPGe）探测器，净注量为$4.95×10^8$ p$^+$/cm²，对应COSI空间辐射环境中约10年的剂量。我们通过一系列高温退火修复了由此导致的能谱分辨率退化，最终获得4.08 keV的半高宽（FWHM），为辐照前值（2.98 keV FWHM）的37%以内。我们通过高温退火时间表征了电荷陷阱的修复情况，为COSI能谱分辨率的长期维护提供退火程序依据。
英文摘要：
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 $4.95\times10^8$ 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.
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