Modification Of The Electron Energy Distribution Function During Lithium Experiments On The National Spherical Torus Experiment

Jaworski, M A ; Gray, T K ; Kaita, R ; Kallman, J ; Kugel, H ; LeBlanc, B ; McLean, A ; Sabbagh, S A ; Soukanovskii, V ; Stotler, D P

关键词: DIVERTORS;    EFFICIENCY;    ELECTRON TEMPERATURE;    ELECTRONS;    ENERGY SPECTRA;    KINETICS;    LANGMUIR PROBE;    LITHIUM;    MODIFICATIONS;    PLASMA;    PROBES;    SIMULATION Lithium;    NSTX;   

DOI  :  10.2172/1025021
RP-ID  :  PPPL-4631
PID  :  OSTI ID: 1025021
Others  :  TRN: US1105273

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The National Spherical Torus Experiment (NSTX) has recently studied the use of a liquid lithium divertor (LLD). Divertor Langmuir probes have also been installed for making measurements of the local plasma conditions. A non-local probe interpretation method is used to supplement the classical probe interpretation and obtain measurements of the electron energy distribution function (EEDF) which show the occurrence of a hot-electron component. Analysis is made of two discharges within a sequence that exhibited changes in plasma fueling efficiency. It is found that the local electron temperature increases and that this increase is most strongly correlated with the energy contained within the hot-electron population. Preliminary interpretative modeling indicates that kinetic effects are likely in the NSTX.