Properties of the propagation of scintillation light in liquid argon (LAr), at λ∼128 nm wavelength, have been experimentally investigated in a dedicated setup at CERN. The speed of scintillation ...photons has been measured for the first time in this medium, refractive index and the Rayleigh scattering are being studied as well. Such measurement provides a key ingredient for the interpretation of data from the current and next generation large mass LAr detectors as those dedicated to the search for rare events such as neutrinos or Dark Matter. Furthermore the improvement on the understanding of the scintillation light propagation represent a benchmark for the multiple theoretical models and simulations for the next generation of detectors which are now based on still incomplete measurements and calculations.
•Measurement of the scintillation light propagation speed in liquid argon.•Optical properties as refractive index and Rayleigh Scattering (λ=128 nm) are derived.•Measurement of interest for LAr-based large scale future experimental setups.•Results can be used to improve current Monte Carlo simulations.
A particle detector that exploits Liquid Argon scintillation light Babicz, M.; Diwan, M.; Fava, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2020, Letnik:
958
Journal Article
Recenzirano
A number of innovative experiments dedicated to neutrino oscillations and rare event physics, such as direct searches for dark matter particles or neutrinoless double beta decays, are using liquefied ...noble-gases, particularly Liquid Argon (LAr), as detection media. Among many advantages of noble liquids, from the detection point of view, the most important ones are high scintillation and ionisation yields, possible long drift paths of ionisation electrons and feasible large detector masses. LAr is sufficiently dense and relatively cheap and therefore is the only adequate noble liquid for huge volumes.
This paper describes a particle detection system that exploits the prompt signals from the scintillation light produced by ionising particles in LAr. The detector has been exposed to cosmic rays. The system performance in terms of trigger efficiency and timing resolution, with a view to its application in neutrino detectors, is presented.
•Particle detection system that exploits the LAr scintillation light has been set up.•The system enables studies of PMTs, DAQ and trigger electronic performances.•The study involves temperature stability, electronic noise and timing synchronisation.•The tests within this system are an important input for a future large LAr detector.
The Picosecond Avalanche Detector is a multi-junction silicon pixel detector devised to enable charged-particle tracking with high spatial resolution and picosecond time-stamping capability. A ...proof-of-concept prototype of the PicoAD sensor has been produced by IHP microelectronics. Measurements with a 55Fe X-ray radioactive source show that the prototype is functional with an avalanche gain up to a maximum electron gain of 23.
The Deep Underground Neutrino Experiment (DUNE) is the next very large scale neutrino science and proton decay experiment. DUNE will consist of large-scale near and far detectors. The core elements ...of these detector systems are liquid argon Time Projection Chambers (LAr TPCs) and light readout systems. Two prototype far detectors were built and operated at CERN Neutrino Platform and extensive developments are underway for improved and upgraded detectors. In order to evaluate various design alternatives and validate new concepts of light readout related to large-scale LAr detectors, we have performed several experiments with a fifty liter liquid argon TPC at CERN. Among the long list of configurations we probed, study of various wavelength shifters, operation in dual phase mode and Xe and N
2
doping under different scenarios can be listed. Here we report on the details of the various test campaigns and discuss our findings and their impact on the design and operational parameters.
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