MRI: Acquisition of Tunable Laser Systems for Laser Induced Fluorescence in Plasmas

MRI：获取等离子体中激光诱导荧光的可调谐激光系统

• 批准号: 0918526
• 负责人: EARL SCIME
• 金额: $ 26.53万
• 依托单位: West Virginia University Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0918526&HistoricalAwards=false
• 关键词: MRI; Acquisition; Tunable; Laser; Systems

Laser-induced-fluorescence (LIF) provides a means of non-perturbatively determining the complete ion or neutral atom velocity distribution (VDF) function in a plasma along any direction with high spatial and temporal resolution. The upgrade of the laser systems currently in use will significantly enhance the present experimental capabilities of the laboratory. The new instrumentation includes a solid-state-laser pumped ring dye laser for Ar II and Xe II LIF and a portable, tunable, high-power diode laser in a Master Oscillator Power Amplifier (MOPA) configuration for Ar II, He I, and Ar I LIF. These new laser components will enhance four ongoing experimental projects, which include: a study of the effects of multi-ion species plasmas on double layer formation in the expansion region of compact helicon source plasma; an investigation of ion heating and acceleration arising from the damping of magnetohydrodynamic waves thought to play important roles in the heating and acceleration of the solar corona; a collaboration with the University of Tromsø that will examine the role of sheared flows in multi-species plasmas, and a collaboration with Auburn University that will investigate the bulk flow of ions while simultaneously measuring the dust velocity field in a complex, i.e., dusty, plasma. In addition to these ongoing collaborations, this group is actively pursuing additional LIF-based collaborations involving plasma thrusters, studies of ion heating during magnetic reconnection, and plasma-assisted reforming of coal into methane. Beyond the impact that the proposed instrumentation will have on ongoing scientific studies, the WVU physics program attracts collaborators from within and outside the United States; over 30 collaborators have participated in either training or collaborative LIF experiments in the PI's laboratory over the past ten years. This group has a record of disseminating their LIF advances through publications, collaborative experiments involving the portable LIF system, and hands-on training of visiting scientists and students from the United States and abroad. In addition, the laboratory provides internal training and education opportunities for graduate students, undergraduates, and postdoctoral researchers. The proposed activities will improve the percentage of women and other underrepresented groups, such as first generation college students, obtaining advanced degrees in physics; increase involvement of undergraduates in cutting-edge scientific research; enhance the mentoring of postdoctoral researchers in the development and leadership of national and international collaborations; help to attract new minority physics faculty, and support the plasma physics investigations of six current external users through their use of the LIF system at WVU and the use of the portable LIF system at their home institutions

激光诱导的荧光（LIF）提供了一种非扰动确定完整的离子或中性原子速度分布（VDF）函数在等离子体中沿任何方向具有高空间和临时分辨率的方法。目前正在使用的激光系统的升级将显着增强实验室的当前实验能力。新仪器包括用于AR II和XE II LIF的固态激光泵染色激光，以及用于AR II，He I I，He I和AR I Lif的主振荡器功率放大器（MOPA）配置中的便携式，可调，高功率二极管激光器。这些新的激光组件将增强四个正在进行的实验项目，其中包括：对紧凑型Helicon Source等离子体扩张区域中多离子物种血浆对双层形成的影响；被认为在太阳能电晕的加热和加速中起着重要作用的磁性流体动力波的阻尼引起的离子加热和加速度的投资；与Tromsø大学的合作，将研究剪切流在多物种等离子体中的作用，以及与奥本大学的合作，该合作将研究离子的大量流动，同时同时测量复合体中的灰尘速度场，即Dusty，等离子体。除了这些持续的合作外，该小组还积极追求基于LIF的合作，涉及等离子体推进器，对磁重新连接期间的离子加热的研究以及等离子体辅助将煤炭改革为甲烷。除了拟议的仪器将具有持续的科学研究的影响之外，WVU物理学计划还吸引了美国内部和外部的合作者；在过去的十年中，有30多个合作者参加了PI实验室的培训或协作LIF实验。该小组有记录通过出版物传播其LIF的进步，合作实验涉及便携式LIF系统以及对来自美国和国外的科学家和学生的动手培训。此外，实验室为研究生，本科生和博士后研究人员提供了内部培训和教育机会。拟议的活动将改善妇女和其他代表性不足的群体的百分比，例如第一代大学生，获得物理学高级学位；增加本科生参与尖端科学研究的参与；增强博士后研究人员在国家和国际合作的发展和领导方面的心理；通过在WVU上使用LIF系统以及在其家庭机构使用Portable LIF系统，帮助吸引新的少数族裔物理教师，并支持六个现有外部用户的等离子体物理投资