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 1-2 cm outside the separatrix near the outer was calculated by a 2-D cross-correlation technique to be Vr∼ 0.2-0.3 km/s. Assuming this to be the local convective plasma velocity, the density SOL width λnwas evaluated using a simple convective model to be λn∼ 4-7 cm, 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. © 2010 Elsevier B.V. All rights reserved.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering
Zweben, S. J., Terry, J. L., Labombard, B., Agostini, M., Greenwald, M., Grulke, O., ... Umansky, M. (2011). Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod. Journal of Nuclear Materials, 415(1 SUPPL), -. https://doi.org/10.1016/j.jnucmat.2010.08.018