XRISM机载X射线微量热计微振动干扰地面试验结果
Ground test results of the micro-vibration interference for the x-ray microcalorimeter onboard XRISM
摘要：
Resolve是X射线成像和光谱学飞行任务（XRISM）中的一个有效载荷，载有一个在50 mK下工作的X射线微量热计探测器。它目前正在开发中，作为国际合作的一部分，计划于2023年推出。一个主要的技术问题是由航天器总线组件引起的灵敏微量热计探测器中的微振动干扰。我们于2021-2022年在实地进行了一系列验证测试，其结果在此报告。我们定义了航天器和Resolve仪器之间的微振动界面。在仪器级测试中，通过向飞行模型硬件注入微振动并使用50 mK级温度稳定性、ADR磁体电流消耗率和探测器噪声谱评估仪器响应，对飞行模型硬件进行了接口级测试。我们发现，当注入约200，380和610赫兹的微振动时，会有强烈的反应。在前两种情况下，在探测器噪声谱中观察到注入频率和制冷机频率谐波之间的拍频。在航天器级测试中，测量了整个航天器在有和没有悬挂的情况下的加速度和仪器响应。反作用轮（RW）和惯性参考单元（IRU），两个主要的微振动源之间的总线组件，进行了操作。总之，观察到的Resolve响应在RW和IRU标称操作范围内的可接受水平内。没有证据表明，由此产生的能量分辨率退化超出了当前的噪声预算分配。
英文摘要：
Resolve is a payload hosting an X-ray microcalorimeter detector operated at 50 mK in the X-Ray Imaging and Spectroscopy Mission (XRISM). It is currently under development as part of an international collaboration and is planned to be launched in 2023. A primary technical concern is the micro-vibration interference in the sensitive microcalorimeter detector caused by the spacecraft bus components. We conducted a series of verification tests in 2021-2022 on the ground, the results of which are reported here. We defined the micro-vibration interface between the spacecraft and the Resolve instrument. In the instrument-level test, the flight-model hardware was tested against the interface level by injecting it with micro-vibrations and evaluating the instrument response using the 50 mK stage temperature stability, ADR magnet current consumption rate, and detector noise spectra. We found strong responses when injecting micro-vibration at about 200, 380, and 610 Hz. In the former two cases, the beat between the injected frequency and cryocooler frequency harmonics were observed in the detector noise spectra. In the spacecraft-level test, the acceleration and instrument responses were measured with and without suspension of the entire spacecraft. The reaction wheels (RWs) and inertial reference units (IRUs), two major sources of micro-vibration among the bus components, were operated. In conclusion, the observed responses of Resolve are within the acceptable levels in the nominal operational range of the RWs and IRUs. There is no evidence that the resultant energy resolution degradation is beyond the current allocation of noise budget.
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