Ion energy measurements on MAST using a midplane RFEA

Scrape-off layer ion temperature measurements at the divertor target during type III and type I ELMs in MAST measured by RFEA

In future nuclear fusion reactors high heat load events, such as edge-localised modes (ELMs), can potentially damage divertor materials and release impurities into the main plasma, limiting plasma performance. The most difficult to handle are type I ELMs since they carry the largest fraction of energy from the plasma and therefore deposit the largest heat flux at the target and on first wall materials. Knowing the temperature of the ions released from ELM events is important since it determines the potential sputtering they would cause from plasma facing materials. To make measurements of Ti b…

稳态等离子体及ELM烧穿现象期间MAST-U偏滤器中的离子温度测量

Ion Temperature Measurements in the MAST-U Divertor During Steady State Plasmas and ELM Burn Through Phenomena

本研究利用RFEA测量MAST-U偏滤器的离子温度，对比了稳态下与LP测得的电子温度，捕捉了ELM烧穿的动力学过程，获得了相关温度数据与比值结果。

Scrape-off layer ion temperature measurements at the divertor target in MAST by retarding field energy analyser

Knowledge of the ion temperature (Ti) is of key importance for determining heat fluxes to the divertor and plasma facing components, however data regarding this is limited compared to electron temperature (Te) data. Ti measurements at the divertor target, between edge-localised modes (inter-ELM) H-mode, have been made using a novel retarding field energy analyser (RFEA).

通过阻滞场能量分析仪在MAST-U偏滤器中首次进行离子温度测量

First Ion Temperature Measurements in the MAST-U Divertor via Retarding Field Energy Analyzer

本研究首次利用阻滞场能量分析仪（RFEA）在MAST-U偏滤器中测量离子温度，发现在稳态和瞬态ELM事件期间离子温度显著高于电子温度且呈现特定动力学特征。

Using Bayesian Analysis and Gaussian Processes to Infer Electron Temperature and Density Profiles on the MAST Experiment

A unified, Bayesian inference of midplane electron temperature and density profiles using both Thompson scattering (TS) and interferometric data is presented. Beyond the Bayesian nature of the analysis, novel features of the inference are the use of a Gaussian process prior to infer a mollification length-scale of inferred profiles and the use of Gauss-Laguerre quadratures to directly calculate the depolarisation term associated with the TS forward model. Results are presented from an application of the method to data from the high resolution TS system on the Mega-Ampere Spherical Tokamak, alo…

L-Mode and Inter-ELM Divertor Particle and Heat Flux Width Scaling on MAST

The distribution of particles and power to plasma-facing components is of key importance in the design of next-generation fusion devices. Power and particle decay lengths have been measured in a number of MAST L-mode and H-mode discharges in order to determine their parametric dependencies, by fitting power and particle flux profiles measured by divertor Langmuir probes, to a convolution of an exponential decay and a Gaussian function. In all discharges analysed, it is found that exponential decay lengths mapped to the midplane are mostly dependent on separatrix electron density and plasma cur…