Abstract
A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for the Deep Underground Neutrino Experiment (DUNE). The detector technology relies on amplification of the ionisation charge in ultra-pure argon vapour and offers several advantages compared to the traditional single-phase liquid argon TPCs. A 4.2 tonne dual-phase liquid argon TPC prototype, the largest of its kind, with an active volume of \ hree has been constructed and operated at CERN. In this paper we describe in detail the experimental setup and detector components as well as report on the operation experience. We also present the first results on the achieved charge amplification, prompt scintillation and electroluminescence detection, and purity of the liquid argon from analyses of a collected sample of cosmic ray muons.
Highlights
Liquid Argon Time Projection Chambers (LAr TPCs) [1] have been under development for many decades
The events are triggered by a logic signal (TTL) which can be provided by either a pulse generator, the Cosmic Ray Taggers (CRTs) or photo-multiplier tubes (PMTs) during cosmic ray data taking. 6.2 Charge signal feedthroughs The Signal Feedthrough (SFT) consist of a 1.5 m stainless vacuum tight steel tube terminated with the appropriate UHV flanges that provide the interface for routing the signals
In this paper we have provided a detailed technical overview and described some aspects of the performance of a large dual-phase liquid argon Time Projection Chamber with a fiducial volume of 3 × 1 × 1 m3 corresponding to more than 4 t active detector mass
Summary
Liquid Argon Time Projection Chambers (LAr TPCs) [1] have been under development for many decades. An alternative solution has been developed within the LAGUNA-LBNO European design study for a dual-phase LAr TPC with a mass between 20 and 50 ktonne [7, 8] and modular detector readout stages to facilitate their deployment underground. The concepts developed within the LAGUNA-LBNO design study and the surrounding R&D activities culminated in a proposal for the large-scale prototype of a dual-phase LAr TPC [17]. This detector, presently considered as a prototype for a DUNE module (ProtoDUNE-DP), consisting of a 6 × 6 × 6 m3 (300 t) active volume dual-phase LAr TPC, is currently under construction at CERN.
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