Noise correlation and decorrelation in arrays of bolometric detectors

TL;DR

This paper presents a decorrelation method to reduce correlated vibrational noise in bolometric detector arrays, improving energy resolution for rare event searches like neutrinoless double beta decay.

Contribution

The paper introduces a novel multichannel decorrelation algorithm specifically designed for bolometer arrays, demonstrated on CUORICINO data.

Findings

Effective noise decorrelation achieved in CUORICINO data

Reduction of vibrational noise improves energy resolution

Method applicable to other bolometric detector arrays

Abstract

Bolometers are phonon mediated detectors used in particle physics experiments to search for rare processes, such as neutrinoless double beta decay and dark matter interactions. They feature an excellent energy resolution, which is a few keV over an energy range extending from a few keV up to several MeV. Nevertheless the resolution can be limited by the noise induced by vibrations of the mechanical apparatus. In arrays of bolometers part of this noise is correlated among different detectors and can be removed using a multichannel decorrelation algorithm. In this paper we present a decorrelation method and its application to data from the CUORICINO experiment, an array of 62 TeO2 bolometers.