Study on the Performance of the YBJ-ARGO RPC

HE Hui-Hai; LIU Kun; LU Hong; SHEN Pei-Ruo; TAN You-Heng; WU Chao-Yong; YANG Qun-Yu; ZHANG Hui-Min; ZHANG Yong

Chinese Physics C> 2004, Vol. 28> Issue(4) : 422-425

Study on the Performance of the YBJ-ARGO RPC

Institute of High Energy Physics,CAS,Beijing 100039,China2 Department of Physics,Yunnan University,Kunming 650091,China

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Abstract：
YBJ-ARGO experiment is designed to detect small size air showers at an energy threshold of～100GeV using a full coverage RPC array. High detector efficiency, good time resolution (～1ns) and low strip multiplicity (～1.2) are needed to meet the experiment requirements. Performance of RPC, including the above mentioned detector parameters together with the RPC current, is studied at high altitude (4300m a.s.l.) with a normal RPC gas mixture, under which high strip and hit multiplicity effect is observed due to the float of the CHAMBER mass reference which creates concomitant strip multiplicity when a large streamer develops in the CHAMBER. By adding SF₆ component into the gas mixture to limit the streamer development together with adjusting the pull-down threshold of the signal-receiving system, the mass-reference-float effect is effectively eliminated, thus achieving lower strip multiplicity and lower working current under the same working high voltage.

References

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. Abbressics M et al . Astroparticle Physics with ARGO Proposal , 19962.　LU Hong et al . HEP NP , 1999 , 23 : 417 —424 (in Chinese)(卢红等. 高能物理与核物理,1999 ,23 : 417 —424)3.　HE Hui-Hai et al . HEP NP , 2001 , 25(1) : 79 —85 (in Chinese)(何会海等. 高能物理与核物理,2001 ,25(1) : 79 —85)4.　QU Ruo-Fei et al . HEP NP , 2001 , 25(5) : 371 —376 (in Chinese)(瞿若飞等. 高能物理与核物理,2001 ,25 (5) : 371 —376)5.　Santonico R et al . Nucl . Instrum. Methods , 1981 , A187 :3776.　Cardarelli R et al . Nucl . Instrum. Methods , 1988 , A263 :207.　Camarri R et al . Nucl . Instrum. Methods , 1998 , A414 :3178.　Santonico R et al . Nucl . Instrum. Methods , 2002 , A493 :137

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HE Hui-Hai, LIU Kun, LU Hong, SHEN Pei-Ruo, TAN You-Heng, WU Chao-Yong, YANG Qun-Yu, ZHANG Hui-Min and ZHANG Yong. Study on the Performance of the YBJ-ARGO RPC[J]. Chinese Physics C, 2004, 28(4): 422-425.

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Received: 2003-07-23
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 Performance of the YBJ-ARGO RPC

Corresponding author: HE Hui-Hai,

Institute of High Energy Physics,CAS,Beijing 100039,China2 Department of Physics,Yunnan University,Kunming 650091,China

Received Date: 2003-07-23
Accepted Date: 1900-01-01
Available Online: 2004-04-05

Abstract: YBJ-ARGO experiment is designed to detect small size air showers at an energy threshold of～100GeV using a full coverage RPC array. High detector efficiency, good time resolution (～1ns) and low strip multiplicity (～1.2) are needed to meet the experiment requirements. Performance of RPC, including the above mentioned detector parameters together with the RPC current, is studied at high altitude (4300m a.s.l.) with a normal RPC gas mixture, under which high strip and hit multiplicity effect is observed due to the float of the CHAMBER mass reference which creates concomitant strip multiplicity when a large streamer develops in the CHAMBER. By adding SF₆ component into the gas mixture to limit the streamer development together with adjusting the pull-down threshold of the signal-receiving system, the mass-reference-float effect is effectively eliminated, thus achieving lower strip multiplicity and lower working current under the same working high voltage.