Study on the Light Output Non-uniformity of PbWO4 Crystal |
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| Authors: | SHAO Ming XU Tong LIU Ming-Chang WANG Cong-Rong RUAN Li-Juan CHEN Hong-Fang PAN Xiao-Hui WANG Cong-Zhou |
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| Institution: | SHAO Ming 1 \ XU Tong\ LIU Ming Chang\ WANG Cong Rong RUAN Li Juan\ CHEN Hong Fang Department of Modern Physics, University of Science and Technology of China, Hefei\ 230026, China PAN Xiao Hui\ WANG Cong Zhou College of Mechanical and Auto Engineering, Hefei University of Technology, Hefei\ 230009, China |
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| Abstract: | This paper presents the measurement on the light output non uniformity of full size PbWO4 crystal, which will be used in the electromagnetic calorimeter (ECAL) of CMS detector. It makes use of the 22Na radiactive source and the coincident method. With the help of convolution fitting method, it is possible to make fine measurement on the light output non uniformity of the crystal. The effect of depolishing one of the lateral faces of the crystal on the non-uniformity has been studied. The slope of the non uniformity curve decreases with the increasing of the roughness. When the roughness reaches Rz=(1.49±0.27)μm the non uniformity curve meets the requirement of CMS ECAL. |
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