Initial Results of a Silicon Sensor Irradiation Study for ILC Extreme Forward Calorimetry
Abstract
Detectors proposed for the International Linear Collider (ILC) incorporate a tungsten sampling calorimeter (`BeamCal') intended to reconstruct showers of electrons, positrons and photons that emerge from the interaction point of the collider with angles between 5 and 50 milliradians. For the innermost radius of this calorimeter, radiation doses at shower-max are expected to reach 100 MRad per year, primarily due to minimum-ionizing electrons and positrons that arise in the induced electromagnetic showers of e+e- `beamstrahlung' pairs produced in the ILC beam-beam interaction. However, radiation damage to calorimeter sensors may be dominated by hadrons induced by nuclear interactions of shower photons, which are much more likely to contribute to the non-ionizing energy loss that has been observed to damage sensors exposed to hadronic radiation. We report here on the results of SLAC Experiment T-506, for which several different types of silicon diode sensors were exposed to doses of radiation induced by showering electrons of energy 3.5-10.6 GeV. By embedding the sensor under irradiation within a tungsten radiator, the exposure incorporated hadronic species that would potentially contribute to the degradation of a sensor mounted in a precision sampling calorimeter. Depending on sensor technology, efficient charge collection was observed for doses as large as 220 MRad.
Keywords
Cite
@article{arxiv.1402.2692,
title = {Initial Results of a Silicon Sensor Irradiation Study for ILC Extreme Forward Calorimetry},
author = {R. Band and V. Fadeyev and R. C. Field and S. Key and T. Kim and T. Markiewicz and F. Martinez-McKinney and T. Maruyama and K. Mistry and R. Nidumolu and B. A. Schumm and E. Spencer and C. Timlin and M. Wilder},
journal= {arXiv preprint arXiv:1402.2692},
year = {2015}
}
Comments
Talk presented at the International Workshop on Future Linear Colliders (LCWS13), Tokyo, Japan, 11-15 November 2013