Session Q1 - Poster Session III.
POSTER session, Monday afternoon, April 07
Regency A, Loews Philadelphia Hotel
The University of Iowa is one of the institutes that participate CMS of LHC project at CERN. The HF calorimeter of the CMS detector is composed of an iron absorber with embedded quartz fibers and the optical read-out system that is composed of pmts and light-guides. Due to both Hf location and the operating conditions, light-guides will be placed between the fiber bundles and the pmts. So as to reduce the loss of light we need the right reflecting material and the optimum design on light-guides. In this paper we give the results of the tests that were performed in University of Iowa CMS laboratories on CMS-Hf light guide system. Two different reflecting materials, as well as two different shapes of light-guides were tested before and after radiation.