Development of BigBite: A Large Acceptance Magnetic Spectrometer for JLab

该提案将提供资金升级一个名为BigBite的探测器，该探测器将从目前位于荷兰NIKHEF核物理设施的位置转移到位于弗吉尼亚州纽波特纽斯的杰斐逊实验室（JLAB）。 BigBite的广泛接受将补充JLAB A厅现有的两台高分辨率光谱仪，使实验能够在数月或数周内完成，否则可能需要数年才能完成。 与NIKHEF相比，该奖项支持的升级将使BigBite能够在JLAB处理更高的计数率（高达六个数量级）。 关键批准的实验，将利用BigBite包括一个高精度的测量中性π介子电生产（提供一个测试的手征QCD动力学），测量的中子电子形状因子在高动量转移，并通过一个三重符合质子敲除反应在核中的短程性质的研究。 探测器升级和实验本身将以一种重要的方式让学生和初级研究人员参与进来。

This proposal will provide funds to upgrade a detector known as BigBite, which will be moved from its present location at the NIKHEF nuclear physics facility in the Netherlands to Jefferson Laboratory (JLAB) in Newport News, Virginia. The large acceptance of BigBite will complement the two existing high-resolution spectrometers in Hall A at JLAB, enabling experiments to be completed in months or weeks that might otherwise have taken years to complete. The upgrade supported by this award will enable BigBite to handle themuch higher counting rates (up to six orders of magnitude) at JLAB compared to NIKHEF. Key approved experiments that will make use of BigBite include a high-precision measurment of neutral pion electroproduction (providing a test of chiral QCD dynamics), a measurement of the neutron electron form factor at high momentum transfer, and a study of short-range properties in nuclei via a triple-coincidence proton-knockout reaction. The detector upgrade and the experiments themselves will involved students and junior investigators in an essential way.