Abstract
ICARUS T600 will be operated as far detector of the Short Baseline Neutrino program at Fermilab (U.S.A.), which foresees three liquid argon time projection chambers along the Booster Neutrino Beam line to search for a LSND-like sterile neutrino signal. The detector employs 360 photomultiplier tubes, Hamamatsu model R5912-MOD, suitable for cryogenic applications. A total of 400 PMTs were procured from Hamamatsu and tested at room temperature to evaluate the performance of the devices and their compliance to detect the liquid argon scintillation light in the T600 detector. Furthermore 60 units were also characterized at cryogenic temperature, in liquid argon bath, to evaluate any parameter variation which could affect the scintillation light detection. All the tested PMTs were found to comply with the requirements of ICARUS T600 and a subset of 360 specimens was selected for the final installation in the detector.
Highlights
: ICARUS T600 will be operated as far detector of the Short Baseline Neutrino program at FNAL (USA), which foresees three liquid argon time projection chambers along the Booster
60 units were characterized at cryogenic temperature, in liquid argon bath, to evaluate any parameter variation which could affect the scintillation light detection
The updated ICARUS T600 light detection system consists of 360 Hamamatsu R5912-MOD PMTs directly operating in liquid argon to reveal scintillation photons produced by ionizing particle
Summary
ICARUS T600 detector is made of two identical cryostats, each housing two TPCs with a common central cathode. Charged particles interacting in liquid argon produce both scintillation light and ionization electrons These latter are drifted by a uniform electric field (E = 500 V/cm) to the anode, made by three parallel wire planes at 1.5 m from the cathode, where they are collected. Before installation the sensitive window of each PMT was coated with about 200 μg/cm of Tetra-Phenyl Butadiene (TPB), a wavelength shifter to convert VUV LAr scintillation photons (λ = 128 nm) to visible light. This process was performed using a dedicated thermal evaporator and a specific deposition technique [5, 6]. A picture of the new light detection system is shown in figure 1
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