Prof. Christer Fröjdh Radiation detector research at Mid Sweden University

Mittuniversitetet Resources Cleanroom for detector processing Class 1000, 4 inch wafers Lithography, heat treatment, metallization, etching.. Radiation lab Nanofocus X-ray source – 160 kVp Radioactive sources Different spectroscopic and imaging detectors Simulation Radiation interaction and charge transport MCNP, Geant4, MEDICI …

Mittuniversitetet Single particle processing detectors Member of the MEDIPIX collaboration since 2000 MEDIPIX3 – spectral X-ray imaging with on chip charge summing TIMEPIX3 – event driven pixel detector with time and energy information per pixel Common features Hybrid pixel detectors Silicon and High-z materials Neutron converters could be applied 256 x 256 pixels with a pitch of 55 um Energy bins or energy per event Tiling to make large areas

Mittuniversitetet Neutron detectors 3D neutron detector structures Etching of pores in silicon Wall preparation to form junctions Filling with neutron converter Readout using TIMEPIX3 Scintillator based neutron detectors using scintillating guides screens Scintillator filled pores in silicon Readout using photosensitive pixel detectors

Mittuniversitetet Main activities at Mid Sweden University Simulation Geant4 based framework for simulation of radiation interaction, charge transport and electronics behavior Processing Processing of detector modules Characterisation Charge sharing and signal formation in hybrid pixel detectors Fundamentals of spectral X-ray imaging Material separation Properties of different sensor materials