Study of the effect of external noise pickups on the performance of a cryogenic bolometer

A Garai; A Reza; A Mazumdar; H Krishnamoorthy; G Gupta; M S Pose; S Mallikarjunachary; V Nanal; R G Pillay; S Ramakrishnan

doi:10.1063/1.5115595

Study of the effect of external noise pickups on the performance of a cryogenic bolometer

Rev Sci Instrum. 2019 Sep;90(9):096104. doi: 10.1063/1.5115595.

Authors

Affiliations

¹ India-Based Neutrino Observatory, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.
² Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.
³ Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.

PMID: 31575278
DOI: 10.1063/1.5115595

Abstract

This paper reports the detailed noise characterization, investigation of various noise sources, and its mitigation to improve the performance of a cryogenic bolometer detector for the TIN.TIN experiment. The noise spectrum has been measured for a sapphire bolometer test setup with an indigenously developed neutron transmutation doped Ge sensor in the cryogen free dilution refrigerator system at Mumbai. The effect of external noise, arising either from ground loops in the system or from the diagnostic and control electronics of the cryostat, on the performance of the bolometer is assessed. A systematic comparison of the influence of different noise pickups on the bolometer resolution is also presented. The best-achieved resolution (σ_E) at 15 mK is ∼15 keV for heater pulses and appears to be mainly limited by the noise due to the pulse tube cryocooler.