Abstract

The Long Baseline Neutrino Facility (LBNF) serves to provide the infrastructure necessary to support the Deep Underground Neutrino Experiment (DUNE), a growing international experiment to study neutrino science and proton decay. Situated at the Sanford Underground Research Facility (SURF), in Lead, SD, USA, DUNE will employ detectors located within massive cryostats filled with a total of 68,400 tons of ultrapure liquid argon. LBNF provides the cryogenic infrastructure necessary to supply and maintain that argon throughout the life of DUNE, as it enables the study of neutrinos from a new and improved beamline from Fermilab, as well as the dynamics of supernovae responsible for producing the heavy elements necessary for life and the possibility of proton decay. This contribution presents the modes of operation, layout, and main features of the cryogenic systems at LBNF. Those systems expected performance, functional requirements, and overall design status is also featured.

Highlights

  • The Deep Underground Neutrino Experiment (DUNE) and Long-Baseline Neutrino Facility (LBNF) represent an international collaborative effort in neutrino physics

  • The detectors, Time Projection Chambers (TPCs), reside in cryostats that will each be filled with some 17,400 tons of liquid argon (LAr) with impurities totaling less than 100 parts per trillion of oxygen equivalent contamination

  • The DUNE detectors will enable the study of neutrinos from a new and improved beamline originating from Fermilab, as well as the dynamics of supernovae and the possibility of proton decay

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Summary

INTRODUCTION

The Deep Underground Neutrino Experiment (DUNE) and Long-Baseline Neutrino Facility (LBNF) represent an international collaborative effort in neutrino physics. The combined project is developing the detectors and surrounding infrastructure for a massive neutrino experiment to be located at the Sanford Underground Research Facility (SURF) in Lead, SD, USA. LBNF includes the four cryostats in which the DUNE detectors reside, as well as the surrounding conventional facilities and cryogenics necessary to receive, transfer, store, purify, and maintain the almost 70,000 tons of LAr required for the experiment. This paper describes the main features, functional requirements and expected performance of the LBNF cryogenics system. It details its current status, present and future needs to support the DUNE experiment. The 15th Cryogenics 2019, IIR Conference, Prague, Czech Republic, April 8-11, 2019

LBNF CRYOGENICS SYSTEM
Modes of Operations
Process Flow Diagram
Relevant design parameters
Infrastructure cryogenics
Proximity cryogenics
SUMMARY
Full Text
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