用于 NewAthena X-IFU 时分复用读出的低温测试台系统性能
System performance of a cryogenic test-bed for the time-division multiplexing readout for NewAthena X-IFU
AI总结：
本文报道了用于 NewAthena X-IFU 的 TDM 低温测试台，其线束长度接近实际设计，通过32行读出在6 keV处实现2.7 eV FWHM 能量分辨率，并展望了集成到焦平面开发模型的前景。
摘要：
X射线积分场单元（X-IFU）是欧空局未来 NewAthena 空间天文台的一台仪器，其目标是通过约1500个过渡边缘传感器（TES）阵列并经 SQUID 时分复用（TDM）读出，在200 eV至12 keV的X射线能量范围内提供高能量分辨率（在最高7 keV的X射线能量下小于4 eV）和高空间分辨率（9角秒）的光谱成像。SRON 已组装了一个基于 TDM 的实验室测试台，其中包含一个75×75 μm² 的 TES 阵列，通过2列×32行 TDM 读出。对高性能运行至关重要的系统组件是连接室温电子设备与低温读出组件的线束。我们在此报告对该测试台的表征结果，其线束长度接近 X-IFU 所设想的长度，从而通过32行读出在6 keV处实现了2.7 eV FWHM 的叠加能量分辨率。此外，我们还展望了将 TDM 读出集成到 X-IFU 焦平面组件开发模型中的前景。
英文摘要：
The X-ray Integral Field Unit (X-IFU) is an instrument of ESA's future NewAthena space observatory, with the goal to provide high-energy resolution ($<$ 4 eV at X-ray energies up to 7 keV) and high-spatial resolution (9") spectroscopic imaging over the X-ray energy range from 200 eV to 12 keV, by means of an array of about 1500 transition-edge sensors (TES) read out via SQUID time-division multiplexing (TDM). A TDM-based laboratory test-bed has been assembled at SRON, hosting an array of $75\times 75\ \upmu$m$^2$ TESs that are read out via 2-column $\times$ 32-row TDM. A system component that is critical to high-performance operation is the wiring harness that connects the room-temperature electronics to the cryogenic readout componentry. We report here on our characterization of such a test-bed, whose harness has a length close to what envisioned for X-IFU, which allowed to achieve a co-added energy resolution at a level of 2.7~eV FWHM at 6~keV via 32-row readout. In addition, we provide an outlook on the integration of TDM readout into the X-IFU Focal-Plane Assembly Development Model.
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