Event 

Title:
Seminarios en el Acelerador - Radiación severa de centelleadores de plástico en las paredes calorimétricas en el detector de ATLAS
When:
07.10.2015 - 07.10.2015
Where:
CMAM - Madrid
Categoría:
Seminarios informales en el Acelerador

Description

Ponente: Elias Sideras-Haddad, Director del MPRI School of Physics, Universidad de Witwatersrand (WITS), South Africa

Titulo: Radiación severa de centelleadores de plástico en las paredes calorimétricas en el detector de ATLAS

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 and light yield analysis whilst structural damage was assessed using Raman spectroscopy. Findings indicate that for the dose of 0.8 MGy, no structural damage occurs and light loss can be attributed to a breakdown in the light transfer between base and fluor dopants. For doses of 8 MGy to 80 MGy, structural damage leads to possible 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 and light yield loss with increasing dose.

 

Venue

CMAM
Venue:
CMAM   -   Website
Street:
Faraday 3, Campus de Cantoblanco
ZIP:
28049
City:
Madrid
Country:
Country: es

Description

El seminario tendrá lugar en la sala de reuniones del CMAM