An active noise cancellation technique for the CUORE Pulse Tube Cryocoolers

摘要

The Cryogenic Underground Observatory for Rare Events (CUORE) experiment atGran Sasso National Laboratory of INFN searches for neutrinoless double betadecay using TeO2 crystals as cryogenic bolometers. The sensitivity of themeasurement heavily depends on the energy resolution of the detector, thereforethe success of the experiment stands on the capability to provide an extremelylow noise environment. One of the most relevant sources of noise are themechanical vibrations induced by the five Pulse Tube cryocoolers used on thecryogenic system which houses the detectors. To address this problem, wedeveloped a system to control the relative phases of the pulse tube pressureoscillations, in order to achieve coherent superposition of the mechanicalvibrations transmitted to the detectors. In the following, we describe thismethod and report on the results in applying it to the CUORE system.