Fundamental Processes in Plasmas

等离子体的基本过程。O'Neil， C.F. Driscoll和D.H.E. dubin3位加州大学圣地亚哥分校教员的合作将解决等离子体中广泛的基本过程，并将强调可以获得精确的理论实验测试的问题。实验将在相机诊断的纯电子等离子体和激光诊断的纯离子等离子体上进行。研究将包括6个一般领域的工作：1)通过等离子体碰撞进行反氢形成和弛化的理论工作将继续进行，范围从奥尼尔的“引导中心原子”制度到更深入的混沌制度。2)实验现在已经测量了强相关等离子体中对平行碰撞的萨尔皮特增强，未来的工作将定量测试理论思想并将其应用于“燃烧前”传播动力学。3)将继续进行远程ExB漂移相互作用的实验和理论研究，利用激光标记对难以捉摸的热激发对流细胞进行成像，表征受背景剪切流限制的热输运、粘度和粒子输运。4)实验将量化新型“电子声模式”下的波相干粒子分布函数，为理解这些非线性波的极端频率变异性提供理论支持。5)二维流体涡旋动力学、无粘波阻尼和“涡旋晶体”的实验和理论将继续进行，包括对这些新状态的统计力学描述。6)实验和理论将发展新古典输运的新“混沌散射”制度，当等离子体旋转驱动θ波纹捕获分离时发生。考虑到正在观察和分析的波阻尼、非线性波耦合和粒子输运效应的广泛范围，这项工作可能是“变革性的”。这里的研究环境非常适合研究生和博士后的培养。该研究与原子物理学、流体动力学、统计力学以及聚变等离子体有很强的跨学科联系。这项研究也由美国能源部在美国国家科学与能源部等离子科学与工程合作伙伴联合招标下的一个单独奖项下资助。

Fundamental Processes in PlasmasT.M. O'Neil, C.F. Driscoll and D.H.E. DubinThis collaboration of 3 UCSD faculty will address a broad range of fundamental processes in plasmas, and will emphasize problems for which precise experimental tests of theory can be obtained. The experiments will be performed on camera-diagnosed pure-electron plasmas and laser-diagnosed pure-ion plasmas. The research will include work in 6 general areas:1) Theory work on anti-hydrogen formation and relaxation via plasma collisions will continue, ranging from O'Neil's "Guiding Center Atom" regime to the more deeply-bound chaotic regimes.2) Experiments have now measured the Salpeter enhancement of perp-to-parallel collisions in strongly correlated plasmas, and future work will quantitatively test theory ideas and apply them to "burn-front" propagation dynamics.3) Experiments and theory on long-range ExB drift interactions will continue, characterizing heat transport, viscosity, and particle transport limited by background shear flows, utilizing laser-tagging to image the elusive thermally-excited convection cells.4) Experiments will quantify the wave-coherent particle distribution function in the novel "Electron Acoustic Mode", with theory support to understand the extreme frequency-variability of these nonlinear waves.5) Experiments and theory will continue on 2D fluid vortex dynamics, inviscid wave damping, and "vortex crystals," including statistical mechanics descriptions of these novel states.6) Experiments and theory will develop the new "chaotic scattering" regime of neoclassical transport, which occurs when theta-rippled trapping separatrices are driven by plasma rotation. This work may be "transformative", given the broad range of wave damping, nonlinear wave coupling, and particle transport effects which are being observed and analyzed.This research environment is ideal for graduate student and post-doctoral training. The research has strong interdisciplinary connections with atomic physics, fluid dynamics, and statistical mechanics, as well as relevance to fusion plasmas.This research is also funded by DoE under a separate award under the NSF-DoE Partnership in Plasma Science and Engineering joint solicitation.