# 18th International Workshop on Low Temperature Detectors (LTD-18)

Jul 22 – 26, 2019
Milano
Europe/Rome timezone

## Systematic studies of a sapphire bolometer with phonon pulses in the temperature range of 10-100 mK

Jul 23, 2019, 5:45 PM
1h 15m
Piazza Città di Lombardia (Milano)

### Piazza Città di Lombardia

#### Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector Development and Physics

### Speaker

Mr Abhijit Garai (Tata Institute of Fundamental Research, Mumbai 400005, India)

### Description

An experiment to search for neutrinoless double beta decay in $^{124}$Sn has been initiated in India [1]. It is envisaged to use a superconducting tin-based cryogenic bolometer (TIN.TIN) operating at $\sim$10 mK for this purpose. It is important to study various systematics related to the cryogenic bolometer with a relatively simpler and well-studied absorber material before making a superconducting tin bolometer. With this motivation, a cryogenic bolometer is made with a sapphire absorber ($\sim$0.7 g) and indigenously made NTD Ge sensor [2]. A systematic study of the bolometer performance in the temperature range of 10-100 mK is performed with phonon pulses of energy equivalent to 0.3 - 5 MeV. A C++ and ROOT based pulse analysis program is developed implementing Savitzky-Golay filtering technique for analysing the bolometer signal. In this paper, response of the sapphire bolometer to phonon pulses in the temperature range of 10-100 mK will be presented. Performance of the bolometer with the addition of a moderate size tin sample ($\sim$0.6 g) to the sapphire substrate is studied. Response of the bolometer, when tested with a $^{241}$Am-$^{239}$Pu alpha source will be presented. Impact of vibration on the bolometer will also be discussed.

1. V. Nanal, EPJ Web of Conferences 66 (2014) 08005.
2. A. Garai et al. Journal of Low Temperature Physics 184 (2016) 609.
Less than 5 years of experience since completion of Ph.D N Y

### Primary author

Mr Abhijit Garai (Tata Institute of Fundamental Research, Mumbai 400005, India)

### Co-authors

Ms A. Mazumdar (Tata Institute of Fundamental Research, Mumbai 400005, India) Ashif Reza (Tata Institute of Fundamental Research, Mumbai, India) Ms H. Krishnamoorthy (Tata Institute of Fundamental Research, Mumbai 400005, India) Mr G. Gupta (Tata Institute of Fundamental Research, Mumbai 400005, India) vandana nanal (Tata Institute of Fundamental Research) Prof. R. G. Pillay (Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India) Prof. S. Ramakrishnan (Tata Institute of Fundamental Research, Mumbai 400005, India)