Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 844, Issue -, Pages 32-44Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2016.11.020
Keywords
Neutrino physics; Cryogenics; Calibration; Low background; Bolometers
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Funding
- Istituto Nazionale di Fisica Nucleare
- Alfred P. Sloan Foundation
- University of Wisconsin Foundation
- Yale University
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC-0012654]
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The Cryogenic Underground Observatory for Rare Events (CUORE) is a ton-scale cryogenic experiment designed to search for neutrinoless double-beta decay of Te-130 and other rare events. The CUORE detector consists of 988 TeO2 bolometers operated underground at 10 mK in a dilution refrigerator at the Laboratori Nazionali del Gran Sasso. Candidate events are identified through a precise measurement of their energy. The absolute energy response of the detectors is established by the regular calibration of each individual bolometer using gamma sources. The close-packed configuration of the CUORE bolometer array combined with the extensive shielding surrounding the detectors requires the placement of calibration sources within the array itself. The CUORE Detector Calibration System is designed to insert radioactive sources into and remove them from the cryostat while respecting the stringent heat load, radiopurity, and operational requirements of the experiment. This paper describes the design, commissioning, and performance of this novel source calibration deployment system for ultra-low-temperature environments. (C) 2016 Elsevier B.V. All rights reserved.
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