Energy resolution of strip superconducting detectors with two tunnel junctions

Abstract A mathematical model of a strip X-ray detector has been developed. The detector consists of a long superconducting strip with two tunnel junctions at both ends. The model developed takes into account the diffusion of nonequilibrium quasiparticles, their capture to the region of the tunnel j...
Ausführliche Beschreibung

Abstract A mathematical model of a strip X-ray detector has been developed. The detector consists of a long superconducting strip with two tunnel junctions at both ends. The model developed takes into account the diffusion of nonequilibrium quasiparticles, their capture to the region of the tunnel junctions, and quasiparticle losses in the bulk and at the boundaries of the superconducting strip. Analytical solutions have been obtained for the boundary conditions of the third kind. It is shown that the quasiparticle losses at the strip boundaries lead to a dependence of the detector signal amplitude on the transverse coordinate of the photon absorption point and deteriorate the energy and spatial resolution. The spectral line has been calculated with allowance for the contribution of electronic noise. Ausführliche Beschreibung