LISA空间任务低噪声光接收器的辐射耐受性
Radiation Tolerance of Low-Noise Photoreceivers for the LISA Space Mission
AI总结：
本研究通过质子、电子和伽马射线辐照测试InGaAs象限光电二极管，验证其在超出LISA任务预期辐射水平约五倍条件下仍满足验证标准，证明其适用于LISA等空间任务。
摘要：
本研究探讨了空间环境辐射对InGaAs象限光电二极管（QPD）性能的影响，并评估其适用于激光干涉空间天线（LISA）任务的适宜性。对直径为1.0、1.5和2.0毫米的QPD进行了20和60 MeV质子、0.5和1 MeV电子以及Co$^{60}$伽马射线的辐照。施加了对应于20和60 MeV质子的位移损伤等效通量$1.0 \times 10^{+12}$ p/cm$^2$和总电离剂量237 krad的暴露，超过了LISA任务预期辐射水平的约五倍。实验测量了QPD暗电流、电容和响应度的变化。QPD与低噪声直流耦合跨阻放大器集成，形成光接收器（QPR）。还测量了在类似LISA的干涉系统中QPR的噪声和性能。尽管辐射影响了其暗电流和响应度，几乎所有QPD都满足LISA的验证标准，未表现出任何关键失效。这些发现证明所测试的QPD是LISA及其他天基任务的有前景候选。
英文摘要：
This study investigates the effects of space environmental radiation on the performance of InGaAs Quadrant Photodiodes (QPDs) and assesses their suitability for the Laser Interferometer Space Antenna (LISA) mission. QPDs of 1.0, 1.5 and 2.0 mm have been irradiated with 20 and 60 MeV protons, 0.5 and 1 MeV electrons, and Co$^{60}$ gamma. An exposure corresponding to a displacement damage equivalent fluence of $1.0 \times 10^{+12}$ p/cm$^2$ for 20 and 60 MeV protons and a total ionizing dose of 237 krad were applied, surpassing the anticipated radiation levels for the LISA mission by a factor of approximately five. Experiments were conducted to measure changes in QPD dark current, capacitance, and responsivity. The QPDs are integrated with a low-noise DC-coupled transimpedance amplifier to form the Photoreceiver (QPR). QPR noise and performance in an interferometric system like LISA were also measured. Although radiation impacted their dark current and responsivity, almost all QPDs met LISA's validation criteria and did not demonstrate any critical failure. These findings prove that the tested QPDs are promising candidates for LISA and other space-based missions.
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