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arXiv 2602.01800physics.ins-det
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质子能量对辐射诱导低增益雪崩探测器退化的影响

Proton Energy Dependence of Radiation Induced Low Gain Avalanche Detector Degradation

CERN, Organisation europénne pour la recherche nucléaire(欧洲核子研究组织);TU Wien, Faculty of Physics(维也纳工业大学物理学院);Instituto de Física de Cantabria, IFCA (CSIC-UC)(坎塔布里亚物理研究所)

Veronika Kraus, Marcos Fernandez Garcia, Luca Menzio, Michael Moll

AI总结:

本研究探讨了质子能量对低增益雪崩探测器辐射退化的影响,发现低能质子导致更严重的增益层退化,而400 MeV质子影响较小,表明NIEL缩放法需修订。

摘要:

低增益雪崩探测器(LGADs)是高能物理实验中精确时间测量的关键组件,包括当前LHC探测器的高亮度升级。然而,其性能受到辐射诱导退化的限制,主要由受体去除驱动。本研究系统地比较了不同入射质子能量下退化的发展情况,使用Hamamatsu Photonics(HPK)和巴塞罗那微电子研究所(IMB-CNM)的LGADs,分别用18 MeV、24 MeV、400 MeV和23 GeV质子照射,剂量高达2.5×10¹⁵ p/cm²。通过电气特性分析提取不同质子能量下的受体去除系数,而红外TCT测量则提供了辐射后LGADs增益演变的互补见解。在所有设备中,低能质子引起更强的增益层退化,符合预期。然而,400 MeV质子始终比低能和高能质子更不具破坏性,这与单调的能量趋势相悖。将质子剂量转换为1 MeV中子等效剂量会减少但不能消除这些差异,表明标准非电离能量损失(NIEL)缩放法未能完全涵盖不同能量下的缺陷形成机制,需在考虑包含更广谱粒子类型和能量的辐射场时进行修订。

英文摘要:

Low Gain Avalanche Detectors (LGADs) are key components for precise timing measurements in high-energy physics experiments, including the High Luminosity upgrades of the current LHC detectors. Their performance is, however, limited by radiation induced degradation of the gain layer, primarily driven by acceptor removal. This study presents a systematic comparison of how the degradation evolves with different incident proton energies, using LGADs from Hamamatsu Photonics (HPK) and The Institute of Microelectronics of Barcelona (IMB-CNM) irradiated with 18 MeV, 24 MeV, 400 MeV and 23 GeV protons and fluences up to 2.5x10^15 p/cm2. Electrical characterization is used to extract the acceptor removal coefficients for different proton energies, whereas IR TCT measurements offer complementary insight into the gain evolution in LGADs after irradiation. Across all devices, lower energy protons induce stronger gain layer degradation, confirming expectations. However, 400 MeV protons consistently appear less damaging than both lower and higher energy protons, an unexpected deviation from a monotonic energy trend. Conversion of proton fluences to 1 MeV neutron-equivalent fluences reduces but does not eliminate these differences, indicating that the standard Non-Ionizing Energy Loss (NIEL) scaling does not fully account for the underlying defect formation mechanisms at different energies and requires revision when considering irradiation fields that contain a broader spectrum of particle types and energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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