Collaborative Research: Development of a Particle Tracking System for the Qweak Experiment

合作研究：Qweak 实验的粒子跟踪系统的开发

• 批准号: 0631081
• 负责人: Gerald Feldman
• 金额: --
• 依托单位: George Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-31 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0631081&HistoricalAwards=false
• 关键词: Collaborative; Research; Development; Particle; Tracking

Ohio University will design and build two sets of triggerscintillators for the Qweak experiment at Jefferson Lab. Thisimportant new experiment will measure the weak charge of the proton,as a precision test of the running of the weak mixing angle, thusproviding a uniquely sensitive probe of physics beyond the StandardModel of particle physics. The trigger scintillators are an essential component of the Qweakparticle tracking system, and will be used to start the electronicsand to veto neutral particles during the calibration and backgroundmeasurements. Each scintillator will be 225 cm x 16 cm x 1 cm andmade from BC408 or its equivalent. Non-UVT lightguides at each endwill provide a mechanically reliable optical coupling joint. UVT rodsthat are 5.1 cm in diameter and 5 cm long will couple the rectangularlightguide to the photomultiplier tubes. The long edges of thescintillators will be diamond milled and the ends finished to a 600grit sanded finish. Given the extreme ratio of thickness to length,the scintillator counters must be supported by a frame which is thenmountable to the rear chamber package. To reduce radiation damage,this package will be removed from direct view of the beam for the highcurrent running mode. The assembly and testing of the detectors will be done at the OhioUniversity Institute for Nuclear and Particle Physics by a graduatestudent and at least one undergraduate student, under the supervisionof Professor Opper. The Ohio University group will also develop the fast triggering system which is required for this experiment. When the detectors have been deemed ready for installation, the students will participate in their commissioning at Jefferson Lab.

俄亥俄大学将为杰斐逊实验室的Qweak实验设计和建造两套触发闪烁体。这个重要的新实验将测量质子的弱电荷，作为弱混合角运行的精确测试，从而提供一个超越粒子物理标准模型的独特敏感的物理探针。触发闪烁体是量子弱粒子跟踪系统的重要组成部分，将在校准和背景测量期间用于启动电子和否决中性粒子。每个闪烁体的尺寸为225厘米× 16厘米× 1厘米，由BC408或同等材料制成。两端的非uvt光导将提供机械上可靠的光学耦合接头。直径5.1厘米，长5厘米的UVT路将矩形光导与光电倍增管耦合。闪烁体的长边缘将被金刚石磨平，末端将被磨成600粒砂。考虑到极端的厚度与长度比，闪烁计数器必须由一个框架支撑，然后安装到后腔封装上。为了减少辐射损伤，该封装将从光束的直接视野中移除，用于高电流运行模式。探测器的组装和测试将在俄亥俄大学核与粒子物理研究所进行，由一名研究生和至少一名本科生在Opper教授的指导下完成。俄亥俄大学小组还将开发该实验所需的快速触发系统。当探测器被认为准备好安装时，学生们将参加他们在杰斐逊实验室的调试。