CAREER: Impact of Plasma Species, Mixing and Ionization Fraction on Drift-Wave Turbulence and Transport

职业：等离子体种类、混合和电离分数对漂移波湍流和传输的影响

• 批准号: 2144099
• 负责人: Saskia Mordijck
• 金额: $ 51.73万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-12-01 至 2026-11-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2144099&HistoricalAwards=false
• 关键词: CAREER; Impact; Plasma; Species; Mixing

This award is funded in part under the American Rescue Plan Act of 2021 (Public Law 117-2). This CAREER award supports a study of plasma turbulence using a combination of experimental and computational approaches. 99% of all visible matter in the universe is a plasma, a state of matter commonly created when a gas is heated to high enough temperatures to strip electrons away from the atoms, creating a cloud of electrically charged particles. Experiments and observations have shown that plasmas can be turbulent, demonstrating similar dynamics to that observed in fluids. When studying the turbulence in plasmas, it is often assumed that plasmas only consist of electrons and one ion species, and these clouds are 100% ionized. However, in reality, plasmas are not fully ionized and the presence of neutral particles can influence the dynamics of turbulence. Moreover, plasmas often contain multiple ion species, which means that the individual ions can have a different mass and charge. Even small concentrations of multiple ion species can have non-linear effects on turbulence and these aspects are often neglected in current models and experiments. Better understanding of the role of mixed-ion species plasmas as well as the influence of neutral particles can provide insights into space weather and the design of nuclear fusion power plants. In addition to the scientific scope, this award supports creation of a sustainable K5 program built to introduce topics related to plasmas and turbulence.This project will use the LArge Plasma Device (LAPD), a linear magnetized plasma device within the Basic Plasma Science Facility at the University of California - Los Angeles, to study drift-wave plasma turbulence. LAPD has the possibility to change the neutral pressure as well as the plasma density and temperature, thus effectively allowing alteration of the ionization ratio and the neutral to plasma fraction. Through dedicated scans of electron temperature, density and neutral density, the experiments will measure the changes in turbulence and plasma flows. These scans will be repeated for different plasma species and eventually mixed plasma species. To better interpret experiments, a fluid plasma code HERMES will be used to self-consistently calculate turbulence and plasma profiles in the presence of neutral species. The combination of modeling and experiments will allow a better understanding of whether the models can capture the dynamics of various (mixed) plasma species and neutrals, or whether the models need to be further developed.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.

该奖项是根据2021年《美国救援计划法》（第117-2）的部分资助。该职业奖通过实验和计算方法的组合支持了血浆湍流的研究。 宇宙中所有可见物质中有99％是血浆，这是一种通常在足够高的温度加热到足够高的温度以将电子从原子上剥离而产生的物质状态，从而产生了电动电荷颗粒的云。实验和观察结果表明，等离子体可能是湍流的，表现出与流体中观察到的动力学相似的动力学。在研究等离子中的湍流时，通常假定等离子体仅由电子和一个离子物种组成，而这些云是100％离子化的。但是，实际上，等离子体并未完全离子化，中性颗粒的存在会影响湍流的动力学。 此外，等离子体通常包含多种离子物种，这意味着单个离子可以具有不同的质量和电荷。即使是少量的多种离子物种也可能对湍流产生非线性影响，并且在当前模型和实验中通常会忽略这些方面。更好地了解混合离子物种等离子体的作用以及中性颗粒的影响可以为太空天气和核融合发电厂的设计提供见解。 除了科学范围外，该奖项还支持创建一个可持续的K5计划，该计划构建了与等离子体和湍流有关的主题。该项目将在加利福尼亚大学 - Los Anlyes University -Los Anlegeles的基本等离子科学设施中使用大型等离子体设备（LAPD），这是一个线性磁化等离子设备，用于研究漂流波拉斯马等皮质湍流。 LAPD有可能改变中性压力以及血浆密度和温度，从而有效地改变了电离比和中性与血浆分数的改变。通过对电子温度，密度和中性密度的专用扫描，实验将测量湍流和等离子体流动的变化。这些扫描将针对不同的血浆物种重复，并最终混合了血浆物种。为了更好地解释实验，在存在中性物种的情况下，将使用流体等离子体代码爱马仕（HERMES）来计算湍流和等离子体轮廓。建模和实验的结合将可以更好地理解模型是否可以捕获各种（混合）等离子体物种和中性物质的动态，或者是否需要进一步开发模型。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的审查审查标准来通过评估来通过评估来获得支持的。

项目成果

Impact of the electron density and temperature gradient on drift-wave turbulence in the Large Plasma Device

电子密度和温度梯度对大型等离子体装置中漂移波湍流的影响

• DOI: 10.1017/s0022377822000630
• 发表时间: 2022
• 期刊: Journal of Plasma Physics
• 影响因子: 2.5
• 作者: Perks, Conor;Mordijck, Saskia;Carter, Troy;Van Compernolle, Bart;Vincena, Stephen;Rossi, Giovanni;Schaffner, David
• 通讯作者: Schaffner, David