Experimental Investigation of Ion Heating Due to Magnetohydrodynamic Waves

磁流体动力波离子加热的实验研究

• 批准号: 0902085
• 负责人: EARL SCIME
• 金额: $ 56.26万
• 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: 2009-07-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902085&HistoricalAwards=false
• 关键词: Experimental; Investigation; Ion; Heating; Due

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project concerns a laboratory investigation of ion heating processes that are hypothesized to occur in the acceleration region of the fast solar wind. The experiments proposed here will continue studies of modifications to the ion velocity distribution function that occur when Alfvén waves propagate into region of strong Alfvén speed gradients; measure changes in Alfvén wave dispersion and continue to look for evidence of reflection and ducting in regions of strong Alfvén speed gradients; determine if ion heating occurs during a turbulent cascade to high k waves at super-cyclotronic frequencies, in single specie and multi-ion species plasmas; investigate parametric decay of shear Alfvén waves at large transverse density gradients; explore the propagation of driven fast MHD waves in regions with large density gradients and look for nonlinear interactions between shear and compressional Alfvén waves with spontaneously excited MHD fast waves in the density gradient region; and compare experimental results to computational codes and analytic theories that include the effects of strong gradients. The experiments will be performed in a space-relevant, laboratory plasma with sufficient diagnostic capability to investigate the evolution of the ion velocity space distribution function of majority and minority ions as they interact with propagating Alfvén waves, to measure the detailed properties of the Alfvén waves in the plasma, and to non-invasively detect and measure the wave number spectrum of perpendicularly propagating waves. The research involves the training of new graduate students in plasma physics, improvement of the percentage of women and underrepresented groups obtaining advanced degrees in physics, involvement of undergraduates in cutting-edge scientific research, and the active engagement of K-12 students and teachers in science and math activities through a robotics-based outreach program. The international collaboration built into the proposed project will provide young scientists an opportunity to develop international collaborations and gain experience working in international teams and institutions - thereby preparing the next generation of scientists for productive research careers in a future that is likely to involve considerable international collaboration in science

该奖项是根据2009年《美国回收与再投资法》（公法111-5）资助的。该项目涉及对离子供暖过程进行的实验室调查，这些调查假设在快速太阳能风的加速区域发生。此处提出的实验将继续研究对Alfvén波传播到强alfvén速度梯度区域时发生的对离子速度分布函数的修改；衡量Alfvén波散分散体的变化，并继续寻找强大的Alfvén速度梯度区域的反射和管道的证据；确定在单个特定和多离子物种等离子体中，在湍流级联对高k波的湍流级联对高k波的高潮中是否发生；研究剪切alfvén波的参数衰减在大的横向密度梯度下；探索具有较大密度梯度的区域中驱动的快速MHD波的传播，并寻找具有赞助的极端极端梯度区域的剪切和压缩Alfvén波之间的非线性相互作用；并将实验结果与包括强梯度影响的计算代码和分析理论进行了比较。实验将在与空间相关的实验室血浆中进行，具有足够的诊断能力，以研究多数和少数离子与繁殖的AlfVén波相互作用时离子速度速度空间空间分布功能的演变，以衡量等离子和非智慧范围的Alfvén波的详细特性，以衡量的范围，并测量了频率的范围，并测量了浪潮的范围。波浪。这项研究涉及对新研究生进行血浆物理学的培训，妇女的百分比和代表性不足的群体的培训，获得了物理学的高级学位，在本科生参与尖端科学研究的参与以及K-12学生在科学和MAT中的积极参与。通过基于机器人技术的外展计划进行活动。拟议项目中内置的国际合作将为年轻科学家提供建立国际合作并获得在国际团队和机构工作的经验的机会，从而在未来的未来中为下一代科学家做好了准备，这可能涉及科学方面的国际合作