The CUORE cryostat: commissioning and performance

[摘要] The Cryogenic Underground Observatory for Rare Events (CUORE) will search for the 0vββ decay in130Te using a cryogenic array of TeO2bolometers, operated at a base temperature of ∼10mK. CUORE will consist of a closely packed array of 19 towers each containing 52 crystals, for a total mass of 741kg. The detector assembly is hosted in one of the largest cryostats ever constructed and will be cooled down to base temperature using a custom-built cryogen free dilution refrigerator. The CUORE cryostat along with the pulse tube based dilution refrigerator has been already commissioned at Laboratori Nazionali del Gran Sasso (LNGS) and a record base temperature, on a cubic meter scale, of ∼6mK was achieved during one of the integration runs. We present the results from integration runs, characterizing the system and the cooling performance of the dilution refrigerator, effectively showcasing its stability at base temperature for the expected thermal load.

[发布机构] Department of Physics, University of California, Berkeley; CA; 94720, United States^1;Department of Physics and Astronomy, University of South Carolina, Columbia; SC; 29208, United States^2;INFN - Sezione di Milano, Milano; I-20133, Italy^3;INFN - Sezione di Genova, Genova; I-16146, Italy^4;Dipartimento di Fisica, Università di Milano-Bicocca, Milano; I-20126, Italy^5;INFN - Sezione di Milano Bicocca, Milano; I-20126, Italy^6;INFN - Laboratori Nazionali Del Gran Sasso, Assergi, L'Aquila; I-67010, Italy^7;Dipartimento di Ingegneria Civile e Meccanica, Università degli Studi di Cassino e Del Lazio Meridionale, Cassino; I-03043, Italy^8;Dipartimento di Fisica, Università di Genova, Genova; I-16146, Italy; (10) Department of Physics, Yale University, New Haven; CT; 06520, United States; (11) INFN - Gran Sasso Science Institute, L'Aquila; I-67100, Italy; (12) Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley; CA; 94720, United States; (13) INFN - Laboratori Nazionali di Frascati, Frascati, Roma; I-00044, Italy; (14) Massachusetts Institute of Technology, Cambridge; MA; 02139, United States; (15) Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila, L'Aquila; 1-67100, Italy; (16) INFN - Sezione di Padova, Padova; I-35131, Italy; (17) Engineering Division, Lawrence Berkeley National Laboratory, Berkeley; CA; 94720, United States; (18) Department of Physics, University of Wisconsin, Madison; WI; 53706, United States^9

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Base temperature;Cooling performance;Detector Assembly;Dilution refrigerator;Meter scale;Packed arrays;Pulse tubes;Total mass