Vignati Model of the Response Function of CUORE Bolometers

2011
ISBN: 978-94-007-1232-4
Verlag: Springer Netherland
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 107 Seiten, eBook

Reihe: Springer Theses

Large mass bolometers are used in particle physics experiments to search for rare processes, like neutrinoless double beta decay and dark matter interactions.
In the next years the CUORE experiment (a 1 Ton detector composed by  1000 crystals of  TeO2 operated as bolometers in a large cryostat at 10mK) will be the particle physics experiment with the highest chance of discovering the Majorana neutrino, a long standing and yet fundamental question of particle physics. 
The study presented in this book was performed on the bolometers of the CUORE experiment. The response function of these detectors is not linear in the energy range of interest, and it changes with the operating temperature, worsening the performances. The nonlinearity appeared to be dominated by the thermistor and the biasing circuit used to read the bolometer, and was modeled using few measurable parameters.
A method to obtain a linear response is the result of this work. It allows a great improvement of the detector operation and data analysis.
With a foreword by Fernando Ferroni.

Zielgruppe

Research

Autoren/Hrsg.

Vignati, Marco

Inhaltsverzeichnis

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

Über Autor(innen)

Marco Vignati received his Master Degree in Physics from the Università di Roma - La Sapienza in June 2004 with final mark 110/110 cum laude. His degree thesis was entitled “CP asymmetry measurement within b?s transitions with the BaBar experiment” and his supervisors were Prof. Fernando Ferroni and Dr. Gianluca Cavoto. In January 2010 he received his Ph.D. in Physics from the same University under the supervision of Prof. Fernando Ferroni.