Toward 1000-Pixel Superconducting-Tunnel-Junction Detectors for X-Ray Absorption Fine Structure Spectroscopy

Fujii, Go; Ukibe, Masahiro; Shiki, Shigetomo; Ohkubo, M.

doi:10.1007/s10909-014-1123-7

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Therefore, to achieve good detection efficiencies, they are generally deployed in arrays to achieve larger solid detection angles. Arrays of 100+ elements have been produced and arrays of 1000+ elements are being contemplated [5][6][7]. Experience with smaller arrays, of up to 32 elements, which mimics the experience with similar sized HPGe detector arrays 25 years ago [8], makes it clear that instrumenting these arrays using multiple copies of single channel processing electronics causes unacceptable operational difficulties for array sizes much is excess of 30 detectors.…”

Section: Introductionmentioning

confidence: 99%

High density processing electronics for superconducting tunnel junction x-ray detector arrays

Warburton

Harris

Friedrich

2015

Nuclear Instruments and Methods in Physics Research Section A:

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Superconducting tunnel junctions (STJs) are excellent soft x-ray (100-2,000 eV) detectors, particularly for synchrotron applications, because of their ability to obtain energy resolutions below 10 eV at count rates approaching 10 kcps. In order to achieve useful solid detection angles with these very small detectors, they are typically deployed in large arrayscurrently with 100+ elements, but with 1000 elements being contemplated. In this paper we review a 5year effort to develop compact, computer controlled low-noise processing electronics for STJ detector arrays, focusing on the major issues encountered and our solutions to them. Of particular interest are our preamplifier design, which can set the STJ operating points under computer control and achieve 2.7 eV energy resolution; our low noise power supply, which produces only 2 nV/√Hz noise at the preamplifier's critical cascode node; our digital processing card that digitizes and digitally processes 32 channels; and an STJ I-V curve scanning algorithm that computes noise as a function of offset voltage, allowing an optimum operating point to be easily selected. With 32 preamplifiers laid out on a custom 3U EuroCard, and the 32 channel digital card in a 3U PXI card format, electronics for a 128 channel array occupy only two small

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