JOSEPHSON READOUT ELECTRONICS FOR THE HYBRID SUPERCONDUCTING PIXEL DETECTOR

We have recently demonstrated the Hybrid Superconducting Pixel Detecto r (HSPD) principle using a test configuration. This demonstrator devic e consists of a semiconductive particle detector coupled to a Josephso n Tunnel Junction (JTJ) acting as current sensitive discriminator. We used Minimum Ionising Particles (MIPs) as events generators. Experimen tal data show the first case of MIPs detection using JTJ. The efficien cy of the demonstrator circuit reaches 90% with 2 MIPs and it will be improved once the complete device will be full integrated in one circu it. A second generation demonstrator, involving an eigth channel reado ut scheme fully implemented with superconducting electronics is being developed and will be discussed in some detail.