Comparison of scrape-off layer turbulence simulations with experiments using a synthetic gas puff imaging diagnostic

Russell, D. A.; Myra, J. R.; D'Ippolito, D. A.; Munsat, T. L.; Sechrest, Y.; Maqueda, R. J.; Stotler, D. P.; Zweben, S. J.; The NSTX Team
February 2011
Physics of Plasmas;Feb2011, Vol. 18 Issue 2, p022306
Academic Journal
A synthetic gas puff imaging (GPI) diagnostic has been added to the scrape-off layer turbulence (SOLT) simulation code, enabling comparisons with GPI data from the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. The edge and scrape-off layer are modeled in the radial and poloidal (bidirectional) dimensions of the outboard midplane region of NSTX. A low-confinement mode discharge is simulated by choosing reference parameters, including radial density and temperature profiles, to be consistent with those of the shot (no. 112825). NSTX and simulation GPI data are submitted to identical analyses. It is demonstrated that the level of turbulent fluctuations in the simulation may be adjusted to give synthetic GPI radial intensity profiles similar to those of the experiment; for a 'best-case' simulation, SOLT and NSTX probability distribution functions of blob radial locations, widths, and GPI image velocities are compared. For the simulation, synthetic GPI image velocity and fluid convection (E×B) velocity are compared and contrasted.


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