Study on the Performance of the YBJ-ARGO RPC

  • 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.
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  • [1] . 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.
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. shu
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Received: 2003-07-23
Revised: 1900-01-01
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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

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.

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