Response of the Killed Electrode in STJ X-ray Detectors

V.A. Andrianov¹ and V.P. Gorkov²

¹Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics,
119991 Moscow, Russian Federation

²Lomonosov Moscow State University, Faculty of Computational Mathematics and Cybernetics, 119991 Moscow, Russian Federation

Abstract - The signals of STJ detectors Ti/Nb/Al,AlO_x/Al/Nb/NbN with killed Ti/Nb electrode were studied as a function of the bias voltage, the energy of the absorbed quanta and the thickness of the electrodes. The nonlinearity of the energy calibration for the killed electrode signal had a positive curvature due to the quasiparticles self-recombination losses and 2Δ-phonon exchange. Suppression of residual signals of the killed electrode was achieved by increasing the thickness of this electrode.

Submitted to ESNF August 12, 2011; accepted September 29, 2011.  Reference ST275, Category 4
Published in Journal of Low Temperature Physics 167, Numbers 3-4, 410-415 , (2012) .