【摘要】 利用2 2 Na放射源和符合测量方法实现了对钨酸铅晶体的光输出纵向非均匀性的精细测量 .研究了改变晶体表面粗糙度对光输出非均匀性的影响更多还原

【Abstract】 This paper presents the measurement on the light output non uniformity of full size PbWO 4 crystal, which will be used in the electromagnetic calorimeter (ECAL) of CMS detector. It makes use of the 22 Na 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 R z =(1.49±0.27)μm the non uniformity curve meets the requirement of CMS ECAL.更多还原