TTF 04

Posters:

1. Synthetic Turbulence Diagnostics for Nonlinear Gyrokinetic Simulations (pdf 650KB) - R. V. Bravenec, Fusion Research Center, The University of Texas at Austin, W. M. Nevins Lawrence Livermore National Laboratory, D. R. Ernst Plasma Science and Fusion Center, MIT, J. Candy, General Atomics.
   
   Gyrokinetic turbulence codes are able to calculate the nonlinearly saturated fluctuations, due to microinstabilities, of plasma parameters in plasma confinement configurations such as the tokamak. These results, however, must be benchmarked against experimental data. This is challenging because of limitations in the diagnostics ( e.g., finite spatial resolution) and the fact that the diagnostics typically do not measure basic plasma parameters. For example, beam-emission spectroscopy measures Balmer-alpha emission from a neutral beam, not electron density per se. In this work, we present a system based on the GKV1 suite of IDL™ routines in which user-supplied "filters" are applied to the code outputs to simulate individual diagnostics. Digital time-series analysis may then be performed on the processed outputs. The results, such as rms fluctuation level, mean wave numbers, correlation lengths and times, etc., can then be compared directly to the experimental analysis.