Ultra-fast Langmuir probe measurements in MAST-U edge plasma

MAST-U 边缘等离子体中的超快速 Langmuir 探针测量

• 批准号: 2787198
• 金额: --
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2787198
• 关键词: Ultra; fast; Langmuir; probe; measurements

Langmuir probes are commonly used to measure plasma parameters such as electron temperature, ion saturation current and floating potential in fusion and technological plasmas. Conventional Langmuir probe systems, however, are not well suited for plasma turbulence investigations due to either a spatial or temporal resolution limitation. Experiments have shown that the edge region in a fusion plasma is very turbulent. For example, fast transient filamentary structures transport plasma particles and heat radially outward across the open magnetic field lines (scrape-off-layer). The midplane reciprocator, fitted with several electrodes at the probe head, is a key diagnostic for measuring filament properties in the scrape-off-layer.A novel ultra-fast Langmuir probe system, based on a field programmable gate array (FPGA), is currently being developed through a collaboration between UKAEA, University of Liverpool and MIT and is due to end in March 2023. This is expected to provide real-time outputs (-1 MHz temporal resolution) of all three plasma parameters using a single electrode. This proposed, primarily experimental, project will continue the development of this system and will use the diagnostic to investigate fast transport phenomena in the edge plasma region of the MAST-U spherical tokamak.

朗缪尔探针通常用于测量等离子体参数，如电子温度、离子饱和电流和聚变和技术等离子体中的浮动电位。然而，由于空间或时间分辨率的限制，传统的Langmuir探针系统不太适合等离子体湍流研究。实验表明，聚变等离子体的边缘区域是非常湍流的。例如，快速瞬态丝状结构通过开放的磁场线（刮脱层）向外传输等离子体粒子和热量。探头头部装有多个电极的中间层往复器是测量刮擦层中长丝性能的关键诊断设备。目前，UKAEA、利物浦大学和麻省理工学院正在合作开发一种基于现场可编程门阵列（FPGA）的新型超高速Langmuir探针系统，预计将于2023年3月结束。这有望提供实时输出（-1 MHz时间分辨率）的所有三个等离子体参数使用一个电极。这个提议的主要是实验性的项目将继续开发该系统，并将使用诊断来研究MAST-U球形托卡马克边缘等离子体区域的快速输运现象。