High Rate Photon Irradiation Test

In this document we report the results from a high rate photon irradiation test of an 8-plane TRT endcap sector prototype with 192 straws instrumented with final front-end electronics. Data was taken at the Weizmann Institute irradiation facility in Israel, with a Gammabeam 150 60Co photon source. Results on the performance of the straws are presented in terms of occupancies and noise rates at high cointing rates, cross-talk studies between straws, and test pulse hit efficiencies under irradiation. The data is compared with a previous irradiation test at the X5 GIF facility at CERN.