Energy resolution and high count rate performance of superconducting tunnel junction x-ray spectrometers
Energy resolution and high count rate performance of superconducting tunnel junction x-ray spectrometers
复制标题
超导隧道结X射线光谱仪的能量分辨率和高计数率性能
DOI：
10.1063/1.1148474
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发表时间：
1998
影响因子：
1.6
通讯作者：
A. Barfknecht
中科院分区：
文献类型：
--
作者：
M. Frank;L. J. Hiller;J. Grand;C. Mears;S. Labov;M. Lindeman;H. Netel;D. Chow;A. Barfknecht
本文给出了一台基于14 1 μm×14 1 μm Nb-Al-Nb超导隧道结探测器的低温冷却高分辨率X射线能谱仪的实验结果。利用单色化同步辐射，我们研究了该能量色散谱仪对能量在70-700 eV之间的软X射线的能量分辨率，并考察了它在近60 000cps计数率下的性能。在数百cps的计数速率下，我们获得了5.9 eV(半高宽)的能量分辨率和4.5 eV的电子噪声(对应于C-K)。随着计数速率的增加，当计数速率高达∼10 000 cps时，分辨率277 eV保持在10 eV以下，然后在23 000 cps时退化到13 eV，在50 000 cps时降低到20 eV。这些结果是使用带有基线恢复器的商用光谱放大器实现的。在这些测量中没有应用堆积拒绝。我们的结果表明，STJ探测器可以工作。
We present experimental results obtained with a cryogenically cooled, high-resolution x-ray spectrometer based on a 141 μm×141 μm Nb-Al-Al2O3-Al-Nb superconducting tunnel junction (STJ) detector in a demonstration experiment. Using monochromatized synchrotron radiation we studied the energy resolution of this energy-dispersive spectrometer for soft x rays with energies between 70 and 700 eV and investigated its performance at count rates up to nearly 60 000 cps. At count rates of several 100 cps we achieved an energy resolution of 5.9 eV (FWHM) and an electronic noise of 4.5 eV for 277 eV x rays (the energy corresponding to C K). Increasing the count rate, the resolution 277 eV remained below 10 eV for count rates up to ∼10 000 cps and then degraded to 13 eV at 23 000 cps and 20 eV at 50 000 cps. These results were achieved using a commercially available spectroscopy amplifier with a baseline restorer. No pile-up rejection was applied in these measurements. Our results show that STJ detectors can operate ...