A superconducting tunnel junction x-ray detector with performance limited by statistical effects
A superconducting tunnel junction x-ray detector with performance limited by statistical effects
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性能受统计效应限制的超导隧道结 X 射线探测器
DOI：
10.1063/1.122372
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发表时间：
1998
影响因子：
4
通讯作者：
A. Barfknecht
中科院分区：
文献类型：
--
作者：
J. Grand;C. Mears;L. J. Hiller;M. Frank;S. Labov;H. Netel;D. Chow;S. Friedrich;M. Lindeman;A. Barfknecht
我们的特点是薄膜Nb/Al/AlOx/Al/Nb超导隧道结（STJ）优化为低电子噪声的X射线探测器在0.2-1 keV的光子能量范围。用这种结测量的光谱具有高光谱纯度，据我们所知，在这个能带中用这种类型的探测器实现了最好的能量分辨率。能量分辨率的理论值与实验值相差仅15%左右。这种小差异的部分原因可能是我们的结具有由铌/铝双层制成的电极，而理论结果是电极仅由一种材料制成。据我们所知，这是第一次与STJ X射线探测器实现的分辨率与从准粒子的创建和隧穿中的统计波动预测的分辨率一致。
We have characterized a thin-film Nb/Al/AlOx/Al/Nb superconducting tunnel junction (STJ) optimized for low electronic noise as an x-ray detector in the 0.2–1 keV photon energy range. The spectra measured with this junction have high spectral purity with, to the best of our knowledge, the best energy resolution ever achieved with this type of detector in this energy band. The discrepancy between the theoretical and experimental energy resolution is only about 15%. Part of this small discrepancy may be explained by the fact that our junction has electrodes made from niobium/aluminum bilayers, while the theoretical result is for electrodes made from only one material. To the best of our knowledge, this is the first time that resolution achieved with a STJ x-ray detector is in agreement with the resolution predicted from statistical fluctuations in the creation and tunneling of quasiparticles.