Jaeckel Felix T, Ambarish C V, Dai Haoran, Liu Shukai, McCammon Dan, McPheron Mari, Nelms Kari L, Roy Avirup, Stueber Haley R, Bandler Simon R, Chervenak James A, Sakai Kazuhiro, Smith Stephen J
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706 USA.
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
IEEE Trans Appl Supercond. 2021 Jan 21;1:1. doi: 10.1109/tasc.2021.3053506.
Pulses of narrow line-width optical photons can be used to calibrate and test sub-2 eV full-width at halfmaximum (FWHM) energy resolution transition-edge sensor (TES) microcalorimeters at low energies (< 1 keV), where it is very challenging to obtain X-ray calibration lines comparable to (or narrower than) the detector resolution. This scheme depends on the ability to resolve the number of 3 eV photons in each pulse, which we have recently demonstrated up to photon numbers of about 300. At LTD-18 we showed preliminary results obtained with this technique on a 0.25 eV baseline resolution TES microcalorimeter designed for the ultra-high-resolution subarray of the Lynx mission. The line-shape was well described by a simple Gaussian. However, the difficulty of delivering photons to the small 46 m square absorbers resulted in a large thermal crosstalk signal, whose random nature is expected to rapidly degrade the observed energy resolution towards higher photon numbers/energies. We have since improved the coupling between the optical fiber and the TES absorber and report here our current results.
窄线宽光学光子脉冲可用于在低能量（<1 keV）下校准和测试半高宽（FWHM）小于2 eV能量分辨率的过渡边缘传感器（TES）微热量计，在该能量范围内，要获得与探测器分辨率相当（或更窄）的X射线校准线极具挑战性。该方案依赖于分辨每个脉冲中3 eV光子数量的能力，我们最近已证明能分辨约300个光子数量。在LTD - 18中，我们展示了用此技术在为Lynx任务超高分辨率子阵列设计的0.25 eV基线分辨率TES微热量计上获得的初步结果。线形可用简单高斯函数很好地描述。然而，将光子传输到46微米见方的小吸收体存在困难，导致产生大的热串扰信号，其随机性预计会使在更高光子数量/能量下观测到的能量分辨率迅速下降。此后我们改进了光纤与TES吸收体之间的耦合，并在此报告我们目前的结果。
