The 4K outer cryostat for the CUORE experiment: Construction and quality control

Abstract

The external shell of the CUORE cryostat is a large cryogen-free system designed to host the dilution refrigerator and the bolometers of the CUORE experiment in a low radioactivity environment. The three vessels that form the outer shell were produced and delivered to the Gran Sasso underground Laboratories in July 2012. In this paper, we describe the production techniques and the validation tests done at the production site in 2012.

Improved Limit on Neutrinoless Double-Beta Decay in Te130 with CUORE

“…The detector is housed in a state-of-the-art cryostat, which shields the detectors from both thermal and gamma radiation. Cooling at the 10 mK stage is achieved by a custom 3 He= 4 He dilution refrigerator [24,[37][38][39][40][41][42][43].…”

Improved Limit on Neutrinoless Double-Beta Decay in $^{130}$Te with CUORE

“…The detector is housed in a state-of-the-art cryostat, which shields the detectors from both thermal and gamma radiation. Cooling at the 10 mK stage is achieved by a custom 3 He/ 4 He dilution refrigerator [24,[37][38][39][40][41][42][43].…”

The CUORE cryostat: An infrastructure for rare event searches at millikelvin temperatures

“…This is the same copper used to produce 4 A detailed description of the vessel production and machining can be found in Ref. [19], where special attention is paid to the description of the welding techniques employed to minimize radioactive contamination during welding.…”

“…The construction of the 4 K outer cryostat, i. e. the 300 K, 40 K and 4 K stages [19], proceeded roughly in parallel with the separate commissioning of the DU. The goal of the first cooldown run, Run 0, was to verify the outer cryostat, both in terms of vacuum tightness and cooling power of the PT system.…”