Relaxation, Intermittency and Dissipation in a Collisionless Plasma
无碰撞等离子体中的弛豫、间歇和耗散
基本信息
- 批准号:2108834
- 负责人:
- 金额:$ 48万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-06-15 至 2025-05-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The purpose of this project is to improve understanding of the basic science of turbulence in a plasma. Turbulence is the complex dynamics of a fluid or gas resulting from nonlinear forces that span a wide range of scales in space and time. Many important effects emerge from turbulence, such as mixing and rapid transport of heat and energy; this influences terrestrial fluids as well as electrically conducting gases, or plasmas, in space and on the sun. Turbulence is usually not uniform in space – it tends to quickly self-organize into irregularly shaped "cells." Inside these cells the plasma is typically quiescent, but the thin boundaries between cells are highly active with sometimes explosive results. Processes causing this self-organization and formation of the cell boundaries are studied in this project. This effort will support a post-doctoral researcher and advance understanding of many observed space plasma phenomena, including solar flares and variability of turbulence in the solar wind, thus contributing to the science underlying space weather.Relaxation processes, turbulence cascade and dissipation mechanisms are each an important area of study in plasma physics and its applications. However these are most frequently studied separately. The fundamental hypothesis advanced in this project is that the nature of the intermittent cascade, and the dissipation that it leads to, are strongly influenced by specific relaxation processes that originate at the energy containing scales. In particular, local relaxation leads to spatial cellularization, and the associated spatial nonuniformity controls the formation of coherent structures, where dissipation is expected to be greatly enhanced. This has been studied, although incompletely, in fluid plasma models such as magnetohydrodynamics, but is poorly understood in fully kinetic plasma models to be considered within this project. Establishing such fundamental connections as parameters are changed to vary among modes of relaxation will advance understanding of fundamental plasma physics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该项目的目的是提高对等离子体湍流基础科学的理解。 湍流是流体或气体的复杂动力学,由跨越空间和时间的广泛尺度的非线性力引起。 湍流产生了许多重要的影响,例如混合和快速传输热量和能量;这影响了地球上的流体以及空间和太阳上的导电气体或等离子体。湍流在空间上通常是不均匀的--它倾向于迅速地自我组织成形状不规则的“细胞”。“在这些细胞内,等离子体通常是静止的,但细胞之间的薄边界是高度活跃的,有时会产生爆炸性的结果。在这个项目中,导致这种自组织和形成的细胞边界的过程进行了研究。 这项工作将为一名博士后研究人员提供支助,并增进对许多已观测到的空间等离子体现象的了解,包括太阳耀斑和太阳风湍流的变化,从而为空间气象的科学基础作出贡献,弛豫过程、湍流级联和耗散机制都是等离子体物理学及其应用研究的一个重要领域。然而,这些最经常被单独研究。 在这个项目中提出的基本假设是,间歇性级联的性质,以及它导致的耗散,强烈地影响着特定的松弛过程,起源于含能量的尺度。特别是,局部松弛导致空间细胞化,和相关的空间非均匀性控制相干结构的形成,其中耗散预计将大大增强。这已经被研究,虽然不完全,在流体等离子体模型,如磁流体力学,但在完全动力学等离子体模型中被认为是在这个项目中知之甚少。 建立这样的基本连接参数的变化,以不同的松弛模式将推进基本等离子体物理学的理解。这个奖项反映了NSF的法定使命,并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。
项目成果
期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Turbulent Magnetogenesis in a Collisionless Plasma
无碰撞等离子体中的湍流磁发生
- DOI:10.3847/2041-8213/ac36cf
- 发表时间:2021
- 期刊:
- 影响因子:0
- 作者:Pucci, F.;Viviani, M.;Valentini, F.;Lapenta, G.;Matthaeus, W. H.;Servidio, S.
- 通讯作者:Servidio, S.
Pressure–Strain Interaction as the Energy Dissipation Estimate in Collisionless Plasma
- DOI:10.3847/1538-4357/ac5d3e
- 发表时间:2022-02
- 期刊:
- 影响因子:0
- 作者:Y. Yang 杨;W. Matthaeus;Sohom Roy;V. Roytershteyn;T. Parashar;R. Bandyopadhyay;Minping 敏平 Wan 万
- 通讯作者:Y. Yang 杨;W. Matthaeus;Sohom Roy;V. Roytershteyn;T. Parashar;R. Bandyopadhyay;Minping 敏平 Wan 万
Strategies for Determining the Cascade Rate in MHD Turbulence: Isotropy, Anisotropy, and Spacecraft Sampling
- DOI:10.3847/1538-4357/ac8f90
- 发表时间:2022-09
- 期刊:
- 影响因子:0
- 作者:Yanwen Wang;R. Chhiber;S. Adhikari;Yan Yang;R. Bandyopadhyay;M. Shay;S. Oughton;W. Matthaeus;M. Cuesta
- 通讯作者:Yanwen Wang;R. Chhiber;S. Adhikari;Yan Yang;R. Bandyopadhyay;M. Shay;S. Oughton;W. Matthaeus;M. Cuesta
Quantifying the Agyrotropy of Proton and Electron Heating in Turbulent Plasmas
- DOI:10.3847/1538-4357/acb25a
- 发表时间:2023-02
- 期刊:
- 影响因子:0
- 作者:Yan Yang;F. Pecora;W. Matthaeus;Sohom Roy;M. Cuesta;A. Chasapis;T. Parashar;R. Bandyopadhyay;D. Gershman;B. Giles;J. Burch
- 通讯作者:Yan Yang;F. Pecora;W. Matthaeus;Sohom Roy;M. Cuesta;A. Chasapis;T. Parashar;R. Bandyopadhyay;D. Gershman;B. Giles;J. Burch
Relativistic Particle Transport and Acceleration in Structured Plasma Turbulence
- DOI:10.3847/1538-4357/ac5332
- 发表时间:2021-12
- 期刊:
- 影响因子:0
- 作者:O. Pezzi;P. Blasi;W. Matthaeus
- 通讯作者:O. Pezzi;P. Blasi;W. Matthaeus
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William Matthaeus其他文献
Optimizing PBSC collection for hematopoietic stem cell transplantation
- DOI:
10.1016/j.jcyt.2015.03.512 - 发表时间:
2015-06-01 - 期刊:
- 影响因子:
- 作者:
Angela M. Timler;Katherine Dennert;Robert Talatzko;Carol Halliday;Anand Padmanabhan;William Matthaeus;Federico Sanchez;Robert Taylor;Nina Garlie - 通讯作者:
Nina Garlie
William Matthaeus的其他文献
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{{ truncateString('William Matthaeus', 18)}}的其他基金
SHINE: Coronal and Interplanetary Magnetic Field: Structure, Topology, Flux Tubes, Transport, and Application to Energetic Particles
SHINE:日冕和行星际磁场:结构、拓扑、通量管、输运以及高能粒子的应用
- 批准号:
1156094 - 财政年份:2012
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Magnetohydrodynamic Turbulence, Charged Particle Transport, and Turbulence in the Corona and Interplanetary Medium
磁流体动力湍流、带电粒子输运以及日冕和行星际介质中的湍流
- 批准号:
1063439 - 财政年份:2011
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
SHINE: Coronal and Interplanetary Magnetic Field: Structure, Topology, Flux Tubes, Transport of Energetic Particles
SHINE:日冕和行星际磁场:结构、拓扑、通量管、高能粒子传输
- 批准号:
0752135 - 财政年份:2008
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Magnetohydrodynamic Turbulence, Charged Particle Transport, and Turbulence in the Extended Solar Atmosphere
磁流体动力湍流、带电粒子输运以及扩展太阳大气中的湍流
- 批准号:
0539995 - 财政年份:2005
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Studies of Magnetohydrodynamic Turbulence and Turbulence in the Corona and Interplanetary Medium
磁流体动力湍流以及日冕和行星际介质中的湍流研究
- 批准号:
0105254 - 财政年份:2001
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Acquisition of an Avalon-Beowulf Cluster and Development of Discipline-Specific Parallel Research Tools
收购 Avalon-Beowulf 集群并开发特定学科的并行研究工具
- 批准号:
9977692 - 财政年份:1999
- 资助金额:
$ 48万 - 项目类别:
Standard Grant
Development of a Modernized Bartol Research Institute Computing Facility
现代化巴托尔研究所计算设施的开发
- 批准号:
9601834 - 财政年份:1997
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Magnetohydrodynamic Turbulence and Turbulence in the Interplanetary Medium
磁流体动力湍流和行星际介质中的湍流
- 批准号:
9713595 - 财政年份:1997
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
Renovation of the Bartol Research Institute Computing Facility
巴托尔研究所计算设施改造
- 批准号:
9602788 - 财政年份:1996
- 资助金额:
$ 48万 - 项目类别:
Standard Grant
Magnetohydrodynamic Turbulence and Turbulence in the Interplanetary Medium
磁流体动力湍流和行星际介质中的湍流
- 批准号:
9318728 - 财政年份:1994
- 资助金额:
$ 48万 - 项目类别:
Continuing Grant
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