Beam Test of the Time Resolution of the BESⅢ Endcap TOF

AN Shao-Hui; WU Chong; LI Xin; CHEN Hong-Fang; HENG Yue-Kun; SUN Zhi-Jia; WANG Yi-Fang; LI Cheng

Chinese Physics C> 2005, Vol. 29> Issue(8) : 775-780

Beam Test of the Time Resolution of the BESⅢ Endcap TOF

Department of Modern Physics, University of Science and Technology of China, Hefei 230026,China2 Institute of High Energy Physics, CAS, Beijing 100049,China

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Abstract：
The Endcap TOF(ETOF)of Beijing Spectrometer(BESⅢ) consists of 2×48 pieces of trapezoidal scintillator (BC408). Its main physics goal is to reach the intrinsic time resolution of 80ps and to realize the 2σ π/k separation at momentum up to 1GeV/c. In this paper, the performance of one ETOF module under different conditions, such as with different packing material、operating voltage and shape of scintillator, is tested by the beam of 800MeV electrons at IHEP. The primary results show that the intrinsic time resolution of ETOF with Tyvek paper wrapping is between 70-90ps.

References

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. BES Collaboration. The BES Upgrade[J] . Nucl. Instrum. Methods,2001, A458: 6272. LI Jia-Cai, ZHANG Liang-Sheng, HU Chun-Liang et al . HEPNP,2005, 29( 1) : 55 - 61(in Chinese)(李家才，张良生，胡春良等.高能物理与核物理，2005, 29(1):55-61)3. HUANG Sheng-Li, XU Zi-Zong, WANG Zhao-Min et al. HEPNP,2002, 26( 9) : 959-963(in Chinese)(黄胜利，许咨宗，汪兆民等.高能物理与核物理，2002, 26(9):959-963)4. BESⅢ Collaboration. BEPCⅡ初步设计.IHEP-BEPCⅡ-SB-03-4.5. LI Xin, WU Chong, AN Shao-Hui et al. HEP NP, 2005, 29(6) :586 - 591(李昕，吴冲，安少辉等.高能物理与核物理，2005,29(6):586-591)

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[6]	WANG Man , LI Jin , CUI Xiang-Zong , XIA Xiao-Mi , LAI Yuan-Fen , YAO Xiao-Guang . PROTOTYPE OF END CAP SHOWER COUNTERAND ITS BEAM TEST. Chinese Physics C, 1987, 11(3): 321-326.

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AN Shao-Hui, WU Chong, LI Xin, CHEN Hong-Fang, HENG Yue-Kun, SUN Zhi-Jia, WANG Yi-Fang and LI Cheng. Beam Test of the Time Resolution of the BESⅢ Endcap TOF[J]. Chinese Physics C, 2005, 29(8): 775-780.

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Received: 2004-12-03
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

Beam Test of the Time Resolution of the BESⅢ Endcap TOF

Corresponding author: AN Shao-Hui,

Department of Modern Physics, University of Science and Technology of China, Hefei 230026,China2 Institute of High Energy Physics, CAS, Beijing 100049,China

Received Date: 2004-12-03
Accepted Date: 1900-01-01
Available Online: 2005-08-05

Abstract: The Endcap TOF(ETOF)of Beijing Spectrometer(BESⅢ) consists of 2×48 pieces of trapezoidal scintillator (BC408). Its main physics goal is to reach the intrinsic time resolution of 80ps and to realize the 2σ π/k separation at momentum up to 1GeV/c. In this paper, the performance of one ETOF module under different conditions, such as with different packing material、operating voltage and shape of scintillator, is tested by the beam of 800MeV electrons at IHEP. The primary results show that the intrinsic time resolution of ETOF with Tyvek paper wrapping is between 70-90ps.