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Aging effect in the BESIII drift chamber 被引量:1
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作者 董明义 修青磊 +9 位作者 伍灵慧 吴智 秦中华 沈品 安芬芬 鞠旭东 刘义 朱凯 欧阳群 陈元柏 《Chinese Physics C》 SCIE CAS CSCD 2016年第1期65-68,共4页
As the main tracking detector of BESIII, the drift chamber provides accurate measurements of the position and the momentum of the charged particles produced in e+e- collisions at BEPCII. After six years of operation,... As the main tracking detector of BESIII, the drift chamber provides accurate measurements of the position and the momentum of the charged particles produced in e+e- collisions at BEPCII. After six years of operation, the drift chamber is suffering from aging problems due to huge beam-related background. The gains of the cells in the first ten layers show an obvious decrease, reaching a maximum decrease of about 29% for the first layer cells. Two calculation methods for the gain change (Bhabha events and accumulated charges with 0.3% aging ratio for inner chamber cells) give almost the same results. For the Malter effect encountered by the inner drift chamber in January 2012, about 0.2% water vapor was added to the MDC gas mixture to solve this cathode aging problem. These results provide an important reference for MDC operating high voltage settings and the upgrade of the inner drift chamber. 展开更多
关键词 besiii drift chamber hit rate AGING accumulated charges Malter effect
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BESIII MDC数据处理系统
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作者 刘春燕 贾卢魁 +10 位作者 毛泽普 马想 邓子艳 王纪科 刘怀民 伍灵慧 李卫东 吴智 罗涛 曹学香 毛虎 《核电子学与探测技术》 CAS CSCD 北大核心 2012年第1期25-31,共7页
北京谱仪III(BESIII)是北京正负电子对撞机II(BEPCII)上的一台大型通用磁谱仪,用于τ-粲物理实验研究。主漂移室(MDC)是BESIII上的主要探测器之一,用于测量带电粒子的位置,动量和粒子类型的鉴别。论文主要介绍了BESIII MDC事例重建系统... 北京谱仪III(BESIII)是北京正负电子对撞机II(BEPCII)上的一台大型通用磁谱仪,用于τ-粲物理实验研究。主漂移室(MDC)是BESIII上的主要探测器之一,用于测量带电粒子的位置,动量和粒子类型的鉴别。论文主要介绍了BESIII MDC事例重建系统,其中包括T0的计算,径迹重建和径迹拟合,数据离线刻度,dE/dx的重建和刻度等软件的原理、结构以及各软件包的主要性能。 展开更多
关键词 离线数据处理 besiii漂移室 事例重建 离线刻度
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Construction and cosmic-ray test of the new inner drift chamber for BESIII
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作者 谢永骥 秦中华 +10 位作者 马骁妍 张建 伍灵慧 谢万 董明义 董静 季筱璐 江晓山 欧阳群 朱科军 陈元柏 《Chinese Physics C》 SCIE CAS CSCD 2016年第9期95-101,共7页
A new inner drift chamber has been built which can replace the aged part of the BESIII drift chamber when needed. The design of the new inner drift chamber can minimize the ineffective area in the very forward and bac... A new inner drift chamber has been built which can replace the aged part of the BESIII drift chamber when needed. The design of the new inner drift chamber can minimize the ineffective area in the very forward and backward region and hence reduce the background event rate. With this design, the new inner drift chamber is expected to have a longer lifetime and improved performance due to the lower occupancy. The endplates and the cylinder were machined with high precision. Wire stringing was performed after the mechanical structure was assembled, and good quality of wire stringing was ensured by measurement of the tension and leakage current of the wires. After completion of the physical construction of the new chamber, a cosmic-ray test was carried out to test its performance. The results of the cosmic-ray test show that the new inner chamber achieves a spatial resolution of127 μm and a d E/dx resolution of 6.4%, which satisfies the design specifications. 展开更多
关键词 besiii drift chamber new inner drift chamber cosmic-ray test
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BESⅢ漂移室性能研究以及数据质量监测
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作者 张艳硕 伍灵慧 +1 位作者 董燎原 顾运厅 《核电子学与探测技术》 CAS CSCD 北大核心 2013年第2期234-239,共6页
研究了BESⅢ漂移室(MDC)时间测量道的性能,包括空间分辨、动量分辨、击中效率、噪声率和Bhabha事例重建效率等。并用2011年的Bhabha事例样本对MDC性能作了run by run监测,研究了引起数据质量变化的各种因素。另外还研究了工作高压丢失(t... 研究了BESⅢ漂移室(MDC)时间测量道的性能,包括空间分辨、动量分辨、击中效率、噪声率和Bhabha事例重建效率等。并用2011年的Bhabha事例样本对MDC性能作了run by run监测,研究了引起数据质量变化的各种因素。另外还研究了工作高压丢失(trip)对MDC性能的影响,此外,为了提高数据质量开发了相应软件包以去掉受高压丢失影响的事例。 展开更多
关键词 北京谱仪besiii漂移室 击中效率 噪声率 高压丢失
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Studies of dE/dx measurements with the BESⅢ
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作者 曹学香 李卫东 +24 位作者 Roy A.Briere 刘春雷 毛泽普 陈申见 邓子艳 何康林 黄性涛 黄彬 黄艳萍 贾卢魁 季晓斌 李秀荣 刘春燕 刘怀民 马秋梅 马想 邱进发 王大勇 伍灵慧 吴智 袁野 张学尧 赵川 张瑶 邹佳恒 《Chinese Physics C》 SCIE CAS CSCD 2010年第12期1852-1859,共8页
The Beijing Spectrometer Ⅲ(BESⅢ)is a general-purpose detector used for the study of τ-charm physics at the Beijing Electron-Positron Collider Ⅱ(BEPC Ⅱ).This paper presents our studies of the dE/dx measurement... The Beijing Spectrometer Ⅲ(BESⅢ)is a general-purpose detector used for the study of τ-charm physics at the Beijing Electron-Positron Collider Ⅱ(BEPC Ⅱ).This paper presents our studies of the dE/dx measurement in the drift chamber of BESⅢ,which is important for the identification of charged particles.Corrections applied to the dE/dx measurement in data reconstruction are discussed.After our current dE/dx calibration,a resolution of about 6% has been obtained for minimum ionization particles,and a 3σ K/πseparation is obtained for momenta up to 760 MeV/c.These results meet the design goals of the BESⅢ drift chamber. 展开更多
关键词 besiii drift chamber energy loss dE/dx CALIBRATION particle identification
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