On the passive electrode signal in X-ray detectors based on superconducting tunnel junctions |
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| Authors: | V. A. Andrianov V. P. Koshelets L. V. Filippenko |
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| Affiliation: | 1.Skobeltsyn Institute of Nuclear Physics,Moscow State University,Moscow,Russia;2.Kotel’nikov Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | X-ray detectors based on superconducting tunnel junctions with the multilayer electrode structure described by the formula Ti/Nb/Al, AlO x /Al/Nb/NbN were studied. The main signal arose during X-ray absorption in the top electrode and had an energy resolution of ∼90 eV at the 5.9-keV line. The bottom passive Ti/Nb electrode provided rapid absorption of excess quasiparticles. The residual signal of the passive electrode was from 7 to 17% of the main signal amplitude. The dependences of the amplitude of this signal on the voltage and the absorbed X-ray energy were measured for detectors with different thicknesses of the top and bottom electrodes. The rate of quasiparticle trapping by the energy trap in the Ti/Nb bilayer was estimated. The main mechanisms of the formation of the passive electrode signal formation were considered and methods for its suppression were proposed. |
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