Abstract
In this paper we describe the design, construction, and operation of afirst large area double-phase liquid argon Large Electron MultiplierTime Projection Chamber (LAr LEM-TPC). The detector has a maximumdrift length of 60 cm and the readout consists of a 40 × 76 cm2 LEM and 2D projective anode to multiply and collectdrifting charges. Scintillation light is detected by means ofcryogenic PMTs positioned below the cathode. To record both chargeand light signals, we have developed a compact acquisition system,which is scalable up to ton-scale detectors with thousands of chargereadout channels. The acquisition system, as well as the design andthe performance of custom-made charge sensitive preamplifiers, aredescribed. The complete experimental setup has been operated for afirst time during a period of four weeks at CERN in the cryostat ofthe ArDM experiment, which was equipped with liquid and gas argonpurification systems. The detector, exposed to cosmic rays, recordedevents with a single-channel signal-to-noise ratio in excess of 30 forminimum ionising particles. Cosmic muon tracks and theirδ-rays were used to assess the performance of the detector, andto estimate the liquid argon purity and the gain at differentamplification fields.
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