Three-Dimensional Neutral Transport Simulations of Gas Puff Imaging Experiments

Stotler, D.P. ; DIppolito, D.A. ; LeBlanc, B. ; Maqueda, R.J. ; Myra, J.R. ; Sabbagh, S.A. ; Zweben, S.J.

Princeton University. Plasma Physics Laboratory.

关键词: Nstx Tokamak;    Clouds;    Transport;    70 Plasma Physics And Fusion Technology;    Electron Density;   

DOI  :  10.2172/815148
RP-ID  :  PPPL-3875
RP-ID  :  AC02-76CH03073
RP-ID  :  815148

美国|英语

来源: UNT Digital Library

【 摘 要 】

Gas Puff Imaging (GPI) experiments are designed to isolate the structure of plasma turbulence in the plane perpendicular to the magnetic field. Three-dimensional aspects of this diagnostic technique as used on the National Spherical Torus eXperiment (NSTX) are examined via Monte Carlo neutral transport simulations. The radial width of the simulated GPI images are in rough agreement with observations. However, the simulated emission clouds are angled approximately 15 degrees with respect to the experimental images. The simulations indicate that the finite extent of the gas puff along the viewing direction does not significantly degrade the radial resolution of the diagnostic. These simulations also yield effective neutral density data that can be used in an approximate attempt to infer two-dimensional electron density and temperature profiles from the experimental images.