Study on the Light Output Non-uniformity of PbWO<SUB>4</SUB> Crystal

SHAO Ming; XU Tong; LIU Ming-Chang; WANG Cong-Rong; RUAN Li-Juan; CHEN Hong-Fang; PAN Xiao-Hui; WANG Cong-Zhou

Chinese Physics C> 2001, Vol. 25> Issue(6) : 555-560

Study on the Light Output Non-uniformity of PbWO₄ Crystal

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 R_z=(1.49±0.27)μm the non uniformity curve meets the requirement of CMS ECAL.

References

[1]

. The CMS Electromagnetic Calorimeter Project Technical Design Report.CERN/LHCC97–33,1997,304—3052. Auffray E,Cavallari F,Davies G J et al.CMS Internal Note CMS,2000,0143. Hillemanns H,Kirn T,Schwenke J et al.CMS NOTE,1998,0054. Depass P,Ernenwein J P,Ille B et al.CMS NOTE,1998,0685. WU J,XU T,LI Ch et al.Nucl.Instr.and Meth.,1998,A419:154—1596. XU Tong,SHAO Ming,LI Cheng et al.Accepted by Nuclear Instrument and Method,Section A,20007. SHAO Ming,LIU HengWen,ZHANG ZiPing.High Energy Phys.and Nucl.Phys.,2001,25(1):50(in Chinese)(邵明,刘衍文,张子平等.高能物理与核物理,2001,25(1):50)

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SHAO Ming, XU Tong, LIU Ming-Chang, WANG Cong-Rong, RUAN Li-Juan, CHEN Hong-Fang, PAN Xiao-Hui and WANG Cong-Zhou. Study on the Light Output Non-uniformity of PbWO₄ Crystal[J]. Chinese Physics C, 2001, 25(6): 555-560.

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Received: 2000-06-26
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the Light Output Non-uniformity of PbWO₄ Crystal

Corresponding author: SHAO Ming,

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

Received Date: 2000-06-26
Accepted Date: 1900-01-01
Available Online: 2001-06-05

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 R_z=(1.49±0.27)μm the non uniformity curve meets the requirement of CMS ECAL.