Studying the Nucleon with the CLAS detector at Jefferson Lab

该项目旨在将杰斐逊实验室正在进行的研究的重要贡献与有前途的本科生的教育经验结合起来。一个由本科生和一名全职教员凯文·吉奥瓦内蒂博士组成的团队将在杰斐逊实验室和詹姆斯·麦迪逊大学探测器开发实验室开展这项工作。我们的目标之一是扩展操作能力并改进CLAS探测器在CEBAF更高预期束流能量下的性能。已经提出了几种类型的量热计作为CLAS的可能的新组件。它们的设计、性能和几何形状都需要评估。JMU小组正在研究这些问题，并将开发读出机制和校准拟议量热计的方法。CLAS探测器自1997年12月投入使用以来，对核物理和粒子物理领域的许多突出问题作出了重要贡献。JMU小组的核心物理兴趣是三夸克体系，一个增强我们对这种结构的基本理解的项目正在进行中。质子和中子是最著名的粒子，它们被描述为三价夸克的结合态。JMU小组将支持这一探索，并计划继续执行轮班工作，并在此提案期间为整个CLAS工作提供可接受的一般服务水平。这很重要。它有助于为CLAS检测器保持高水平的生产力。除了CLAS项目外，申请资金的一小部分将用于支持一项新工作。JMU研究小组计划为PSI新批准的mu+寿命实验建立一个校准和监测系统，并参与数据采集和初始光束测试。这项工作与JMU正在进行的探测器开发工作重叠。这种测量具有根本性的重要性，因为它可以用来确定基本相互作用的强度，即弱耦合常数GF。

0072339GiovanettiThis project is designed to integrate important contributions to theongoing research at Jefferson Lab with an educational experience forpromising undergraduate students. A team of undergraduate students and one full time faculty member, Dr. Kevin Giovanetti, will carry out this work both at Jefferson Lab and in the James Madison University detector development laboratory. One of our goals is to extend the operational capabilities and to improve the CLAS detector for performance at the higher anticipated beam energies of CEBAF. Several types of calorimeters have been proposed as possible new components for CLAS. Their design, performance and geometry need to be assessed. The JMU group is studying these issues and will develop readout mechanisms and methods for calibrating the proposed calorimeters. The CLAS detector has been operational since December 1997 and has been making important contributions to many outstanding questions in Nuclear and Particle physics. The central physics interest for the JMU group is the three-quark system and a program to enhance our fundamental understanding of this structure is now underway. The proton and the neutron are the best known of the particles that are described as a bound state of three valence quarks. The JMU group will support this exploration and plans to continue to perform shift work and to provide an acceptable level of general service toward the overall CLAS effort for the duration of this proposal. This is important. It helps maintain a high level of productivity for the CLAS detector.In addition to the CLAS project, a small portion of the requested fundswill support a contribution to a new effort. The JMU research groupplans to build a calibration and monitoring system for a newly approved mu+ Lifetime experiment at PSI and to participate in data-taking and initial beam tests. The work overlaps the ongoing detector development at JMU. The measurement is of fundamental importance because it can be used to determine the strength of a fundamental interaction, the weak coupling constant GF.