MRI-Consortium: Development of the Pre-Shower Calorimeter for the CLAS12 Detector at Jefferson Lab

这项提案的资金是为在托马斯·杰斐逊国家加速器设施进行的实验建造一个粒子探测器。将要建造的仪器将是CLAS12探测器的一部分，位于Hall-B位置，高能电子将入射到质子和中子的目标上。这些实验的目的是为了更多地了解目标核子内部的夸克。特别是，夸克的量子力学性质，如轨道角动量，可以由夸克径向分布的组合来确定，并与它们的动量分布相关。这样的测量被称为广义Parton分布（gpd）。其他的测量，比如夸克在被高能电子撞击后变成完全成熟的粒子的时空演化，也将在这个探测器上进行。这些测量将有助于我们理解量子色动力学（QCD），它是夸克和胶子之间基本力的基础。在此过程中，探测电子散射反应产生的粒子的技术将扩展到更高的能量。技术的改进是医学成像等一系列应用取得进步的基石。由本MRI资助的探测器组件将在以下机构建造：俄亥俄大学，詹姆斯麦迪逊大学，威廉玛丽学院和诺福克州立大学，由学生（本科生和研究生），博士后研究人员和教师与杰斐逊实验室工作人员合作提供劳动力。这为学生和博士后提供了宝贵的技术经验，将增加他们的就业机会。

The funding for this proposal is to build a particle detector for experiments conducted at Thomas Jefferson National Accelerator Facility. The instrumentation to be build will be part of the CLAS12 detector, located in the Hall-B location where high-energy electrons will be incident onto targets of protons and neutrons. The purpose of these experiments is to learn more about the quarks inside the target nucleons. In particular, the quantum mechanical properties of the quarks, such as the orbital angular momentum, can be determined from a combination of the quark radial distributions, correlated with their momentum distributions. Such measurements are known as Generalized Parton Distributions, or GPDs. Other measurements, such as the space-time evolution of the quarks turning into fully-fledged particles after being struck by a high-energy electron, will also be carried out at this detector. These measurements will contribute to our understanding of Quantum Chromodynamics, or QCD, which underlies the fundamental force between quarks and gluons. In the process, the technology to detect particles from electron-scattering reactions will be extended to higher energies. Improvements in technology are the cornerstone of advances in a range of applications such as medical imaging. The detector components funded by this MRI will be constructed at the following institutions: Ohio University, James Madison University, College of William and Mary, and Norfolk State University, with labor provided by students (both undergraduate and graduate), postdoctoral researchers and faculty, in collaboration with Jefferson Lab staff. This provides valuable technical experience for the students and postdocs that will enhance their career opportunities.