A superconducting X-ray spectrometer with a tantalum absorber andlateral trapping |
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| Authors: | Gaidis MC Friedrich S Segall K Prober DE Szymkowiak AE Moseley SH |
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| Affiliation: | Dept. of Appl. Phys., Yale Univ., New Haven, CT ; |
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| Abstract: | We report the development of Nb-Ta-Al-Al2O3-Al superconducting tunnel junction structures for high energy resolution and high efficiency X-ray detection. These devices utilize a Ta X-ray absorber with superconductor “bandgap engineered” quasiparticle trapping to improve charge collection. Experimental results at 0.3 K are presented, showing energy resolution of 102 eV full-width-half-maximum for 6 keV X-rays. Collected charge is in excess of 5×106 electrons. The absorption efficiency is better than 35%. Devices thermally cycle with no change in characteristics |
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