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

路易斯安那理工大学的中能核物理组由四名教职员工组成：托尼·福里斯特、凯瑟琳·约翰斯顿、内文·西米切维奇和史蒂夫·威尔斯。作为对杰斐逊实验室C厅量子弱实验的承诺的一部分，该小组将建造粒子跟踪系统的区域1组件。区域1探测器将利用气体电子倍增作为电离室信号的前置放大器，这有助于测量弹性散射电子相对于室表面的位置。根据COMPASS实验中这些电离室的性能，这些装置应该很好地适应Q弱实验校准运行期间预期的较低速率。根据指南针的设计，将建造两个腔室，其表面积将不到原来30厘米x 30厘米罗盘腔室的一半。我们将使用类似的多路传输电子设备来读出密室。AS-7螺旋芯片板目前正在用我们的样机电离室进行测试。研究生杰娜·克拉夫特将以区域1跟踪系统的设计、建造和性能评估为基础撰写她的论文。两名本科生贾斯汀·比姆和杰里米·多宾斯将在今年夏天获得仪器和测试原型探测器的经验。我们预计会有同样数量的本科生参与到这个项目的过程中。

The intermediate-energy nuclear physics group atLouisiana Tech consists of four faculty members: Tony Forest,Kathleen Johnston, Neven Simicevic and Steve Wells. As part ofits commitment to the Qweak experiment in Hall C atJefferson Lab, the group will construct the Region 1 component tothe particle tracking system. The Region 1 detector will utilize gaselectron multiplication as a preamplifier to the ionizationchamber signal, which facilitates a measurement of the elasticallyscattered electron's position with respect to the face of thechamber. Based on the performance of these chambers in theCOMPASS experiment, the devices should be well suited to thelower rates expected during the calibration runs for theQweak experiment. Two chambers will be constructed, based onthe COMPASS design, which will be less that half the surface areaas the original 30cm x 30cm COMPASS chambers. We will usesimilar multiplexing electronics to read out the chambers. TheAS-7 Helix chip boards are presently being tested with ourprototype ionization chamber. Graduate student Jena Kraft will base her thesis on thedesign, construction, and performance evaluation of the region 1tracking system. Two undergraduates, Justin Beam and JeremyDobbins, will gain experience instrumenting and testing theprototype detector this summer. We anticipate a similar numberof undergraduates will be involved over the course of theproject.