Development of membrane cryostats for large liquid argon neutrino detectors

[摘要] A new collaboration is being formed to develop a multi-kiloton Long-Baseline neutrino experiment that will be located at the Surf Underground Research Facility (SURF) in Lead, SD. In the present design, the detector will be located inside cryostats filled with 68,400 ton of ultrapure liquid argon (less than 100 parts per trillion of oxygen equivalent contamination). To qualify the membrane technology for future very large-scale and underground implementations, a strong prototyping effort is ongoing: several smaller detectors of growing size with associated cryostats and cryogenic systems will be designed and built at Fermilab and CERN. They will take physics data and test different detector elements, filtration systems, design options and installation procedures. In addition, a 35 ton prototype is already operational at Fermilab and will take data with single-phase detector in early 2016. After the prototyping phase, the multi-kton detector will be constructed. After commissioning, it will detect and study neutrinos from a new beam from Fermilab. These cryostats will be engineered, constructed, commissioned, and qualified by an international engineering team. This contribution presents the on-going effort on the development of the cryostats and details the requirements and the current status of the design.

[发布机构] Fermi National Accelerator Laboratory, PO Box 500, Batavia; IL; 60510, United States^1;CERN, Geneva-23; 1211, Switzerland^2;ETH Zurich, Institute for Particle Physics, Zurich; CH-8093, Switzerland^3;Lawrence Berkeley Laboratory, 1 Cyclotron Rd, Berkeley; CA; 94720, United States^4;INFN - Sezione di Pavia, Via Bassi 6, Pavia; 27100, Italy^5;INFN - Laboratori Nazionali Del Sud, Via S. Sofia 62, Catania; 95123, Italy^6;Brookhaven National Laboratory, PO Box 5000, Uptown; NY; 11973, United States^7;INFN - Laboratori Nazionali Del Gran Sasso, Via Acitelli 22, Assergi (AQ); 67100, Italy^8

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Detector elements;Filtration systems;Installation procedures;International engineering;Neutrino detectors;Neutrino experiments;Parts per trillion;Research facilities