Quantifying the Effect of Cosmic Ray Showers on the X-IFU Energy Resolution
Quantifying the Effect of Cosmic Ray Showers on the X-IFU Energy Resolution
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DOI：
10.1007/s10909-019-02330-3
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发表时间：
2020-02
影响因子：
2
通讯作者：
P. Peille;R. den Hartog;A. Miniussi;S. Stever;S. Bandler;C. Kirsch;M. Lorenz;T. Dauser;J. Wilms;S. Lotti;F. Gatti;C. Macculi;B. Jackson;F. Pajot
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作者：
P. Peille;R. den Hartog;A. Miniussi;S. Stever;S. Bandler;C. Kirsch;M. Lorenz;T. Dauser;J. Wilms;S. Lotti;F. Gatti;C. Macculi;B. Jackson;F. Pajot
X射线积分场单元（X-IFU）将在90 ámK下运行超过3000个过渡边缘传感器像素的阵列，在7ákeV下具有前所未有的2.5áeV能量分辨率。在太空中，仪器结构中产生的初级宇宙射线和次级粒子将在探测器晶片上连续存款能量，并在像素的热浴上引起波动。我们通过模拟X-IFU读出链研究了这些波动最终如何影响X射线光子的能量测量。在阵列中的不同位置处的热浴波动的现实时间线被生成为热模型和带电粒子的沉积能量的预期分布的函数。然后，这些被用来模拟TES对这些热扰动的响应及其对机载能量重建过程的影响。总的来说，我们表明，有足够的散热，主要的能量分辨率退化的影响仍然是最小的，并在相关的分辨率分配0.2aeV。我们进一步研究如何将一个专用的触发算法可以到位，以标志罕见的大型热事件。
The X-ray Integral Field Unit (X-IFU) will operate an array of more than 3000 Transition Edge Sensor pixels at 90ámK with an unprecedented energy resolution of 2.5áeV at 7ákeV. In space, primary cosmic rays and secondary particles produced in the instrument structure will continuously deposit energy on the detector wafer and induce fluctuations on the pixels’ thermal bath. We have investigated through simulations of the X-IFU readout chain how these fluctuations eventually influence the energy measurement of X-ray photons. Realistic timelines of thermal bath fluctuations at different positions in the array are generated as a function of a thermal model and the expected distribution of the deposited energy of the charged particles. These are then used to model the TES response to these thermal perturbations and their influence on the onboard energy reconstruction process. Overall, we show that with adequate heatsinking, the main energy resolution degradation effect remains minimal and within the associated resolution allocation of 0.2áeV. We further study how a dedicated triggering algorithm could be put in place to flag the rarer large thermal events.