Design of the cryogenic systems for the Near and Far LAr-TPC detectors of the Short-Baseline Neutrino program (SBN) at Fermilab

M Geynisman,D Montanari,J Tillman,S Hentschel,M Sarychev,F Schwartz,M Chalifour,C Montanari,M Zuckerbrot,T Nichols,M Delaney,M Dinnon,J Bremer,R Doubnik,B Norris,M J Kim

doi:10.1088/1757-899x/278/1/012119

Abstract

The Short-Baseline Neutrino (SBN) physics program at Fermilab and Neutrino Platform (NP) at CERN are part of the international Neutrino Program leading to the development of Long-Baseline Neutrino Facility/Deep Underground Neutrino Experiment (LBNF/DUNE) science project. The SBN program consisting of three Liquid Argon Time Projection Chamber (LAr-TPC) detectors positioned along the Booster Neutrino Beam (BNB) at Fermilab includes an existing detector known as MicroBooNE (170-ton LAr-TPC) plus two new experiments known as SBN’s Near Detector (SBND, ∼260 tons) and SBN’s Far Detector (SBN-FD, ∼760 tons). All three detectors have distinctly different design of their cryostats thus defining specific requirements for the cryogenic systems. Fermilab has already built two new facilities to house SBND and SBN-FD detectors. The cryogenic systems for these detectors are in various stages of design and construction with CERN and Fermilab being responsible for delivery of specific sub-systems. This contribution presents specific design requirements and typical implementation solutions for each sub-system of the SBND and SBN-FD cryogenic systems.

Highlights

In January 2015, an official proposal was introduced for a three-detector Short-Baseline Neutrino (SBN) program in the Fermilab Booster Neutrino Beam (BNB) [1]
The SBN program is designed to address the search of short-baseline neutrino oscillations and test the existence of light sterile neutrinos with unparalleled sensitivity
The SBN program relies on the deployment of three high precision neutrino detectors, all built in the Liquid Argon Time Projection Chamber (LAr-TPC) technology, at different distances along a single high-intensity neutrino beam

Summary

Introduction

In January 2015, an official proposal was introduced for a three-detector Short-Baseline Neutrino (SBN) program in the Fermilab Booster Neutrino Beam (BNB) [1]. Each of the LAr-TPC detectors is essentially a cryostat filled with highly purified liquid argon and equipped with an electronic readout that measures the ionization charge produced by the passage of charged particles. Neutrino interactions with the liquid argon inside the detector volume produce ionization electrons that drift along the electric field until they reach finely segmented and instrumented anode wire planes of TPC upon which they produce signals that are utilized for imaging and analyzing the event that occurred. LAr-TPC detector provides three-dimensional imaging and acts as a calorimeter of very fine granularity and high accuracy

Methods

Conclusion