112-Pixel Arrays of High-Efficiency STJ X-Ray Detectors |
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Authors: | S. Friedrich J. Harris W. K. Warburton M. H. Carpenter J. A. Hall R. Cantor |
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Affiliation: | 1. Lawrence Livermore National Laboratory, Livermore, CA?, 94550, USA 2. XIA LLC, Hayward, CA?, 94544, USA 3. STAR Cryoelectronics, Santa Fe, NM?, 87508, USA
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Abstract: | 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 (mu ) m (times ) 208 (mu ) m Ta–Al– ({text {AlO}}_x) –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/ (surd ) 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. |
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