Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod

The convective radial transport effects of SOL turbulence have been estimated using recent turbulence data from the gas puff imaging (GPI) camera diagnostic on Alcator C-Mod. The average radial turbulence speed within the region 1–2cm outside the separatrix near the outer was calculated by a 2-D cro...

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Bibliographic Details
Published in:	Journal of nuclear materials 2011-08, Vol.415 (1), p.S463-S466
Main Authors:	Zweben, S.J., Terry, J.L., LaBombard, B., Agostini, M., Greenwald, M., Grulke, O., Hughes, J.W., D’Ippolito, D.A., Krasheninnikov, S.I., Myra, J.R., Russell, D.A., Stotler, D.P., Umansky, M.
Format:	Article
Language:	eng
Subjects:	Applied sciences Computational fluid dynamics Controled nuclear fusion plants Energy Energy. Thermal use of fuels Exact sciences and technology Fission nuclear power plants Fuels Installations for energy generation and conversion: thermal and electrical energy Nuclear fuels
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Summary:	The convective radial transport effects of SOL turbulence have been estimated using recent turbulence data from the gas puff imaging (GPI) camera diagnostic on Alcator C-Mod. The average radial turbulence speed within the region 1–2cm outside the separatrix near the outer was calculated by a 2-D cross-correlation technique to be Vr∼0.2–0.3km/s. Assuming this to be the local convective plasma velocity, the density SOL width λn was evaluated using a simple convective model to be λn∼4–7cm, which is ∼2–3 times higher than that measured using a Langmuir probe. This convective velocity was also ∼2–3 times lower than the velocities estimated from analytic blob models, but showed a similar scaling with plasma current at constant q95. The measured blob speeds were lower than both the convective speeds and the analytic blob model speeds.
ISSN:	0022-3115 1873-4820