X-ray STJ detector response is analyzed in the framework of the kinetic transport equation for the non-equilibrium quasi-particles. Numerical solutions of the resulting equation which describes the diffusion of excitations in the plane of the junction are presented and discussed. A particular attention is paid to the limits of ''small'' and ''large'' junctions, with respect to the effective diffusion length of quasi-particles. An almost linear behaviour is expected, under suitable conditions, for ''large'' Nb-based devices, in agreement with experiments reported in the current literature. Deviations from linearity are however possible in ''small'' devices or in case of short electronic mean free path.
SUPERCONDUCTING TUNNEL JUNCTION DETECTORS - THE QUASI-PARTICLE DIFFUSION IN THE NONLINEAR REGIME
1995
Abstract
X-ray STJ detector response is analyzed in the framework of the kinetic transport equation for the non-equilibrium quasi-particles. Numerical solutions of the resulting equation which describes the diffusion of excitations in the plane of the junction are presented and discussed. A particular attention is paid to the limits of ''small'' and ''large'' junctions, with respect to the effective diffusion length of quasi-particles. An almost linear behaviour is expected, under suitable conditions, for ''large'' Nb-based devices, in agreement with experiments reported in the current literature. Deviations from linearity are however possible in ''small'' devices or in case of short electronic mean free path.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
