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Comparison of Gas Puff Imaging Data in NSTX with DEGAS 2 Simulations

B. Cao, D. P. Stotler, S. J. Zweben, M. Bell, A. Diallo, B. Leblanc

Fusion Science and Technology / Volume 64 / Number 1 / July 2013 / Pages 29-38

Technical Paper /

Gas puff imaging is a two-dimensional diagnostic that measures the edge D light emission from a neutral D2 gas puff near the outer midplane of the National Spherical Torus Experiment (NSTX). DEGAS 2 is a three-dimensional Monte Carlo code used to model neutral transport and plasma-neutral interactions in fusion plasmas. In this paper, we compare the measured and modeled D light emission for specific NSTX experiments. Both the simulated spatial distribution and the radiance of the D light emission agree well with the experimental data obtained during time periods between edge-localized modes (ELMs) in ELMy H-modes.

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