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 年美国复苏和再投资法案（公法 111-5）资助的。该项目涉及对快速太阳风加速区域中发生的离子加热过程的实验室研究。此处提出的实验。将继续研究当阿尔芬波传播到强阿尔芬速度梯度区域时发生的离子速度分布函数的修改，测量阿尔芬波色散的变化并继续寻找强阿尔文速度梯度区域中反射和波导的证据；确定在超回旋频率下的高 k 波湍流级联期间是否发生离子加热，在单离子和多离子等离子体物种中研究剪切阿尔文波的参数衰减；大横向密度梯度；探索驱动快速 MHD 波在大密度梯度区域中的传播，并寻找剪切波和压缩阿尔文波之间的非线性相互作用密度梯度区域中自发激发的 MHD 快波；并将实验结果与计算代码和分析理论进行比较，其中包括强梯度的影响。实验将在具有足够诊断能力的空间相关实验室等离子体中进行，以研究演化。测量多数离子和少数离子与传播的阿尔文波相互作用时的离子速度空间分布函数，测量等离子体中阿尔文波的详细特性，并非侵入性地检测和测量阿尔文波的波数谱该研究涉及等离子体物理学新研究生的培训、提高女性和少数群体获得物理学高级学位的比例、本科生参与尖端科学研究以及 K-12 的积极参与。通过基于机器人的推广计划，学生和教师参与科学和数学活动，从而将国际合作纳入拟议项目，将为年轻科学家提供发展国际合作并获得在国际团队和机构中工作的经验的机会，为下一代做好准备。从事富有成效的研究事业的科学家未来可能会涉及大量的国际科学合作