<p>We present an investigation into the effects of high-energy proton damage on charge trapping in germanium cross-strip detectors with the goal of accomplishing three important measurements. First, we calibrated and characterized the spectral resolution of a spare COSI-balloon detector in order to determine the effects of intrinsic trapping, finding that electron trapping due to impurities dominates over hole trapping in the undamaged detector. Second, we performed two rounds of proton irradiation of the detector in order to quantify, for the first time, the rate at which charge traps are produced by proton irradiation. We find that the product of the hole trap density and cross-sectional area, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10686_2025_9978_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">$[n\sigma ]_\textrm{h}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mo stretchy="false">[</mo> <mi>n</mi> <mi>σ</mi> <mo stretchy="false">]</mo> </mrow> <mtext>h</mtext> </msub> </math></EquationSource> </InlineEquation>, follows a linear relationship with the proton fluence, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10686_2025_9978_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">$F_\textrm{p}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>F</mi> <mtext>p</mtext> </msub> </math></EquationSource> </InlineEquation>, with a slope of <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10686_2025_9978_Article_IEq3.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="184" /> </InlineMediaObject> <EquationSource Format="TEX">$(5.4\pm 0.4)\times 10^{-11}\,\mathrm {cm/p^{+}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mo stretchy="false">(</mo> <mn>5.4</mn> <mo>±</mo> <mn>0.4</mn> <mo stretchy="false">)</mo> </mrow> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>11</mn> </mrow> </msup> <mspace width="0.166667em" /> <mrow> <mi mathvariant="normal">cm</mi> <mo stretchy="false">/</mo> <msup> <mi mathvariant="normal">p</mi> <mo>+</mo> </msup> </mrow> </mrow> </math></EquationSource> </InlineEquation>. Third, by utilizing our measurements of physical trapping parameters, we performed calibrations which corrected for the effects of trapping and mitigated degradation to the spectral resolution of the detector.</p>

Characterizing hole trap production due to proton irradiation in germanium cross-strip detectors

期刊论文
出版模式：

开放获取
发表日期：

2025年1月24日

查看全文

Sean N. Pike,
Steven E. Boggs,
Gabriel Brewster,
Sophia E. Haight,
Jarred M. Roberts,
Albert Y. Shih,
Joanna Szornel,
John A. Tomsick,
Andreas Zoglauer

摘要

We present an investigation into the effects of high-energy proton damage on charge trapping in germanium cross-strip detectors with the goal of accomplishing three important measurements. First, we calibrated and characterized the spectral resolution of a spare COSI-balloon detector in order to determine the effects of intrinsic trapping, finding that electron trapping due to impurities dominates over hole trapping in the undamaged detector. Second, we performed two rounds of proton irradiation of the detector in order to quantify, for the first time, the rate at which charge traps are produced by proton irradiation. We find that the product of the hole trap density and cross-sectional area, $[n\sigma ]_\textrm{h}$ ${[n σ]}_{h}$ , follows a linear relationship with the proton fluence, $F_\textrm{p}$ $F_{p}$ , with a slope of $(5.4\pm 0.4)\times 10^{-11}\,\mathrm {cm/p^{+}}$ $(5.4 \pm 0.4) \times 10^{- 11} cm / p^{+}$ . Third, by utilizing our measurements of physical trapping parameters, we performed calibrations which corrected for the effects of trapping and mitigated degradation to the spectral resolution of the detector.