First Observation of Signals Due to KAERI's 10 MeV Electron Beam by Using GEM Detectors
2007
Department of Physics, University of Texas, Arlington, TX 76019, U.S.A.(Received 12 September 2006)Performance tests of a single channel double Gas Electron multiplier (GEM) detector constructedby the Radiation Detector Development Group of Changwon National University (CNU) and amulti-channel double GEM chamber constructed by the High Energy Physics Group of the Univer-sity of Texas at Arlington was carried out at the Korea Atomic Energy Research Institute (KAERI’s)RF accelerator by using 10-MeV electron beams during May 20 - 26, 2006. In this experiment, weobserved signals by both 10-MeV beam electrons and X-ray photons in the CNU single-channeldouble GEM chamber and in the UTA chamber by using an oscilloscope and photographed wave-forms. By analyzing the chamber output signals on the oscilloscope, computing the number ofX-rays photons produced by bremsstrahlung of the beam electrons in a 2-mm lead plate, calculat-ing the angular distribution of beam electrons caused by multiple scatterings in the lead plate, andestimating the interaction probabilities of X-ray photons in the lead plate, the Ar/CO
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