Model of the Response Function of CUORE Bolometers

Foreword Acknowledgements 1 Neutrino masses and double beta decay 1.1 Oscillations 1.2 Masses 1.3 Double beta decay 1.3.1 Nuclear matrix elements 1.4 Experimental searches for neutrinoless double beta decay 1.4.1 Past and present experiments 1.4.2 Future experiments 2 TeO2 bolometric detectors for 0_DBD search 2.1 Bolometric detectors 2.1.1 The energy absorber 2.1.2 The choice of TeO2 2.1.3 The sensor 2.1.4 NTD-Ge thermistors 2.2 Bolometer operation 2.3 Arrays of TeO2 bolometers 2.4 Cryogenic setups 2.5 Signal readout 2.5.1 Measurement of the static resistance 2.6 Detector noise 2.7 CUORICINO and CUORE 3 Model of the response function of CUORE bolometers 3.1 The CCVR run 3.2 The Model 3.2.1 Thermistor model 3.2.2 Biasing circuit 3.2.3 Bessel filter 3.2.4 Thermal model 3.2.5 Simplified model without temperature dependences 3.2.6 Fit to data 3.2.7 Response function simulation 3.2.8 Amplitude dependence on the working temperature 3.2.9 Extraction of RS from the relationship between amplitude and baseline 4 Thermal response analysis 4.1 Data analysis procedure 4.2 The Thermal Response algorithm 4.3 Check of the TR algorithm on MonteCarlo data 4.4 Data analysis 4.4.1 Calibration 4.5 Residual drift in time 4.6 Sources of systematic errors 4.6.1 Choice of the derivative algorithm 4.6.2 Error on the biasing and read-out circuits parameters 5 Thermal response analysis on the Three Towers detector 5.1 The Three Towers detector 5.2 Measurements of model parameters 5.2.1 Measurement of V G RS and VS 5.2.2 Measurement of G/GS 5.2.3 Measurement of RL 5.2.4 Measurement of VBGS 5.2.5 Measurement of cp 5.3 Results on calibration data 5.4 Results on background data 5.5 Future developments 6. Conclusions Appendix A Thermal response analysis on the CCVR detector Appendix B Precision measurements on the Three Towers detector