KIP - Cryogenic particle detection - SSG

Superheated Superconducting Granulares

The phase transition from normal- to superconducting state is of first order in magnetic fields and the transition temperature is different for cooling and heating. This Hysteresis allows to superheat such superconductors and keep them at temperatures above the transition temperature for cooling. A sufficient heat input might drive the superconductor into the normal state in which it will remain after cooling back to its original temperature. A superheated superconducting granular detector (SSG) consists of many small superconducting spheres which are superheated and whose magnetization is used to monitor the absorption particles. Under radiation more and more spheres will turn normal and will therefore reduce the magnetization signal. In this way a SSG is a dosimetric detector with a certain energy threshold. Further details about this concept can be obtained at:

ORPHEUS University of Bern (Switzerland)

Fig. 1: Evolution of the magnetization of superheated superconducting granulares under radiation.