Exploring Fundamental Properties of Matter with Electromagnetic Probes

用电磁探针探索物质的基本性质

• 批准号: 1207672
• 负责人: Michael Kohl
• 金额: $ 43.5万
• 依托单位: Hampton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1207672&HistoricalAwards=false
• 关键词: Exploring; Fundamental; Properties; Matter; Electromagnetic

With the award, Dr. Michael Kohl, assistant professor in the experimental nuclear physics group of Hampton University, will be able to continue to pursue the OLYMPUS experiment at DESY in Hamburg, Germany, and to maintain and expand his leadership role as the elected OLYMPUS spokesperson. The OLYMPUS experiment at DESY, Germany, will precisely measure the ratio of elastic positron-proton and electron-proton scattering cross sections. With this measurement, OLYMPUS will definitively determine the effect of two-photon exchange in lepton-proton scattering and hence verify if it is indeed responsible for the discrepancy in measurements of the proton electric to magnetic form factor ratio between the polarization transfer and cross section methods as observed at Jefferson Lab. Without such a definitive test, not only the electromagnetic form factors but the interpretations of all electron scattering data, usually done in the framework of single-photon exchange, are under considerable doubt. The OLYMPUS experiment has been prepared since official approval by DESY and of the US funding by NSF and DOE in 2010 and has taken first data in Februry 2012. It is scheduled for further running in fall 2012. The OLYMPUS apparatus is to a large extent based on the previous BLAST detector from MIT, which has been relocated to DESY and reassembled. Several components were upgraded or newly added, such as the new Gas Electron Multiplier (GEM) based forward elastic tracking telescopes for luminosity monitoring, which have been built by Dr. Kohl's new group at Hampton University with help of NSF funding. The operation and maintenance of the GEM detectors and future analysis of this essential component of OLYMPUS has been and continues to be the main institutional responsibility of the Hampton group.Dr. Kohl's research program has many facets and offers a great opportunity for first class education and research purpose domestically and abroad. This project will continue to combine utilization of a new lab on the campus of Hampton University with forefront research at the sites of large research facilities such as DESY and Jefferson Lab, and provide new research and educational opportunities for students from minority populations, predominantly African-Americans. Dr. Kohl has been successfully working with Hampton University undergraduate and graduate students and has been a dedicated mentor for the postdoctoral researchers of the Hampton group. Dr. Kohl has been maintaining a strong partnership with MIT, which has a goal of providing a pipeline of talented undergraduate students toward graduate education in top schools and to ultimately increase the number of African-American PhDs.

在该奖项中，汉普顿大学实验性核物理小组的助理教授迈克尔·科尔（Michael Kohl）将能够继续在德国汉堡的Desy进行奥林巴斯实验，并在当选的奥林匹斯邦（Olympus）担任当选的奥林匹斯发言人。 德国Desy的奥林巴斯实验将精确地测量弹性正电子和电子 - 普罗顿散射横截面的比率。通过此测量，奥林巴斯将明确确定两光子交换在Lepton-Proton散射中的影响，因此验证它是否确实负责质子电气与磁性偏振转移和横截面方法之间的测量值的差异正如杰斐逊实验室所观察到的。 如果没有这样的确定测试，不仅是电磁形式因素，而且通常在单光子交换框架内完成的所有电子散射数据的解释都存在很大疑问。 自从DESY和NSF和DOE在2010年由NSF和DOE提供的美国资助以来，Olympus实验已经准备好了，并于2012年2月进行了首次数据。它计划在2012年秋季进一步运行。在很大程度上，Olympus Apparatus是基于范围的。在先前的MIT爆炸检测器上，该检测器已重新安置为DESY并重新组装。 升级或新添加了几个组件，例如基于新的GAS电子乘数（GEM）的前向弹性跟踪望远镜用于发光性监测，这些望远镜由Kohl博士在NSF资金的帮助下在汉普顿大学的新小组中建造。 Olympus的这一基本组成部分的宝石检测器的运行和维护一直是汉普顿集团的主要机构责任。科尔的研究计划有许多方面，并为一流的教育和研究目的提供了一个很好的机会。 该项目将继续将汉普顿大学校园中一个新实验室的利用与在大型研究机构（如Desy和Jefferson实验室的地点）的最前沿研究相结合，并为来自少数人口的学生提供新的研究和教育机会，主要是非洲 - 非洲人 - 美国人。科尔博士一直在与汉普顿大学的本科生和研究生成功合作，并一直是汉普顿小组博士后研究人员的敬业导师。科尔博士一直与麻省理工学院保持牢固的合作伙伴关系，该公司的目标是提供一群才华横溢的本科生，以在顶尖学校的研究生教育上，并最终增加非裔美国人博士学位的数量。