Abstract
In the context of the Neutrino Platform, CERN has designed, constructed, and commissioned the proximity cryogenics systems that serve two CERN based large-scale prototypes of future neutrino detectors. Each of these prototypes features a high voltage time projection chamber placed inside a membrane cryostat being submerged in 600m3 of liquid argon at about 1.0 bar. A copper and molecular sieve based cryogenic purification system has to ensure that the argon in the cryostat has a contamination level below 100 ppt oxygen equivalent. The two proximity cryogenics systems provide the purging, cool-down, filling, normal operation and emptying modes for each cryostat. This paper reports on the design, construction and commissioning of the ProtoDUNE proximity cryogenics facilities.
Highlights
The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, large scale international experiment for neutrino and proton decay studies
The detector requirements Separate beam lines from the CERN Super Proton Synchrotron (SPS) beam deliver particles to the Neutrino Platform (NP)-02 and NP-04 detectors. During their flight inside the time projection chambers, particles interact with the liquid argon releasing free electrons
The dual phase NP-02 detector [2] features a vertical 300 kV high voltage field capable to extract the electrons across the liquid surface reaching the gas phase collection grid, amplifying a low signal with a limited noise creation
Summary
The Deep Underground Neutrino Experiment (DUNE) is a leading-edge, large scale international experiment for neutrino and proton decay studies. With the mandate to develop and test the technologies required to perform very large scale liquid argon science experiments, CERN is hosting the two DUNE prototypes, called ProtoDUNE NP-02 and ProtoDUNE NP-04, featuring different detection strategies. 2. The detector requirements Separate beam lines from the CERN Super Proton Synchrotron (SPS) beam deliver particles to the NP-02 and NP-04 detectors. The detector requirements Separate beam lines from the CERN Super Proton Synchrotron (SPS) beam deliver particles to the NP-02 and NP-04 detectors During their flight inside the time projection chambers, particles interact with the liquid argon releasing free electrons. Auxiliary detector functions require nitrogen contamination below 10 ppm.
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