Systematic Studies of a Sapphire Bolometer with Phonon Pulses in the Temperature Range of 10–100 mK
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Systematic studies with a sapphire bolometer test setup, made with indigenously made NTD Ge sensor, are carried out. A C++ and ROOT-based pulse analysis program implementing Savitzky–Golay filtering technique for analyzing the bolometer signal is discussed. Response of the bolometer subject to heater pulses of energy equivalent of 0.3–5 MeV is presented in the temperature range of 10–100 mK. The energy resolution is found to be 15 ± 3 keV in the temperature range of 15–25 mK. It is observed that the energy resolution of the bolometer is nearly constant \(\sim \,15\,\pm \) 3 keV over the energy range of 0.3–5 MeV. Performance of the bolometer with the addition of a moderate-size tin sample (\(\sim \) 0.6 g) to the sapphire substrate is presented. The impact of vibration on the bolometer is also discussed.
KeywordsNTD Ge sensor Cryogenic bolometer Vibrational noise
We thank Mr. M.S. Pose, Mr. S. Mallikarjunachary, Mr. K. V. Divekar and Mr. Anil Kumar for assistance during the measurements. We are grateful to Prof. A. Bhattacharya, Prof. S.S. Prabhu and their laboratory staff for assistance in sensor and heater fabrication and we thank the Tin.Tin and the INO collaboration.