Abstract
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. Samples subjected to 6 MeV proton irradiation using the tandem accelerator of iThemba LABS, were irradiated with doses of approximately 0.8 MGy, 8 MGy, 25 MGy and 80 MGy. The optical properties were investigated using transmission spectroscopy whilst structural damage was assessed using Raman spectroscopy. Findings indicate that for the dose of 0.8 MGy, no structural damage occurs but a breakdown in the light transfer between base and fluor dopants is observed. For doses of 8 MGy to 80 MGy, structural damage leads to hydrogen loss in the benzene ring of the PVT base which forms free radicals. This results in an additional absorptive component causing increased transmission loss as dose is increased.
Highlights
The Tile Calorimeter of the ATLAS detector, is a hadronic calorimeter responsible for recording the energy and trajectory of hadrons, taus as well as jets of quarks and gluons that result from the protonproton collisions within the Large Hadron Collider of CERN
We present preliminary results for EJ200, a polyvinyl toluene based plastic obtained from ELJEN Technologies
According to the results obtained in this study, irradiation to high doses in plastic scintillator EJ200 using 6 MeV protons causes radiation damage and leads to a reduced performance in its scintillation capabilities
Summary
The Tile Calorimeter of the ATLAS detector, is a hadronic calorimeter responsible for recording the energy and trajectory of hadrons, taus as well as jets of quarks and gluons that result from the protonproton collisions within the Large Hadron Collider of CERN. The steel plates act as an absorber medium, converting the incoming jets to a ‘shower’ of particles whilst the scintillator tiles absorb energy from the incoming particles and fluoresce to emit light. This light is passed through wavelength shifting optical fibres and detected by photomultiplier tubes. The GAP region between the central and extended barrels, where many of the read-out electronics components are housed, contain additional scintillator plates. These assist with reconstruction of missing transverse energy within this region. These assist with reconstruction of missing transverse energy within this region. [1]
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