The radiation hardness properties of a tile/fiber calorimeter with different materials or with different optical path layouts have been studied. Ten calorimeter modules of a geometry similar to that of the proposed SDC calorimeter were irradiated using the BEPC electron beam (1.1 or 1.3 GeV). Radiation damage was quantified by measuring the light yield at various locations within the calorimeter modules at different integrated doses. The recovery process and the dependence on the ambient atmosphere were also studied and correction techniques for various dose and depth profiles were developed.

Radiation hardness tests of scintillating tile/WLS fiber calorimeter modules

Calorimetry and radiation damage

Radiation hardness of a scintillating tile/fiber calorimeter is studied by irradiating electromagnetic test modules with 2.5 GeV electrons at the KEK linac. The induced damage is evaluated in a 2 GeV electron test beam by measuring the reduction in pulse height after irradiation. The pulse height peak for 2 GeV electrons is found to decrease by 19.3 ± 1.3% for a dose of 0.61 Mrad and 14.9 ± 2.7% for 0.33 Mrad. In addition to these modules, several tile/fiber assemblies were irradiated up to 4.8 Mrad and the damage as a function of dose was measured with a radioactive source. Effects of radiation damage on the linearity and energy resolution at higher energies are evaluated using a GEANT simulation and the measured damage.

Beam test of radiation hardness of a scintillating tile/fiber calorimeter

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Beam test of radiation hardness of a scintillating tile/fiber calorimeter