112-Pixel Arrays of High-Efficiency STJ X-Ray Detectors
112-Pixel Arrays of High-Efficiency STJ X-Ray Detectors
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DOI：
10.1007/s10909-014-1151-3
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发表时间：
2014-08-01
影响因子：
2
通讯作者：
Cantor, R.
中科院分区：
文献类型：
--
作者：
Friedrich, S.;Harris, J.;Cantor, R.
我们正在开发基于超导隧道结（STJ）的下一代高分辨率高速X射线探测器。它们由112个像素阵列的208米208米钽铝-铝-钽隧道结的钽吸收体增加了检测效率相比，早期的铌基STJ。为了读出这些中等尺寸的检测器阵列，我们还开发了一个紧凑的和可扩展的32通道的输入电压噪声1 nV/Hz和直流电压偏置的Fiske模式谐振之间的稳定STJ操作的双通道放大器。像素在整个阵列上具有均匀的响应，在525 eV处的能量分辨率在7.5和9.5 eV FWHM之间，并且可以以每像素1，000个计数/秒操作。
We are developing the next generation of high-resolution high-speed X-ray detectors based on superconducting tunnel junctions (STJs). They consist of 112-pixel arrays of 208 m 208 m Ta-Al--Al-Ta tunnel junctions whose Ta absorber increases the detection efficiency compared to earlier Nb-based STJs. To read out these medium size detector arrays we have also developed a compact and scalable 32-channel preamplifier with an input voltage noise 1 nV/Hz and a dc voltage bias for stable STJ operation between Fiske mode resonances. The pixels have a uniform response across the array, an energy resolution between 7.5 and 9.5 eV FWHM at 525 eV, and can be operated at several 1,000 counts/s per pixel.