BOLOMETERS DEVELOPMENT, WITH SIMULTANEOUS MEASUREMENT OF HEAT AND IONIZATION SIGNALS, AT SACLAY

We report the latest developments of our work on bolometers. Low noise readout simultaneously in charge and heat channel was achieved. Tests were conducted using a 7 g bolometer build in Berkeley. Baseline widt hs 350 eV (1 sigma, phonon) and 1 keV (1 sigma, ionisation) were measu red. But the 60 keV phonon width was found to be significantly larger than the baseline width. Also the amplitude of ionisation signal was f ound to drift with time. This effect motivated a detailed study of ion isation detectors at very low temperatures. Behavior of PIN silicon di odes (Hamamatsu) was investigated from room temperature to 3 K. First results are shown.