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Interactions of LH with Edge Turbulence

Interactions of LH with Edge Turbulence S. Zweben, J. Terry, O. Grulke, D. Stotler, S. Bernabei, D. D’Ippolito, B. LaBombard, J. Myra, G. Schilling, R. Wilson C-Mod Ideas Forum 12/2-3/04. Goal: Study effect of LH on edge turbulence and vice versa

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Interactions of LH with Edge Turbulence

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  1. Interactions of LH with Edge Turbulence S. Zweben, J. Terry, O. Grulke, D. Stotler, S. Bernabei, D. D’Ippolito, B. LaBombard, J. Myra, G. Schilling, R. Wilson C-Mod Ideas Forum 12/2-3/04 Goal: Study effect of LH on edge turbulence and vice versa Method: Look at GPI + diodes with variable LH conditions Run time: Initially piggyback, maybe modulate LH later

  2. Possible Interactions • Change in edge turbulence level correlated with LH - reduction seen in HT-7 (Ding PPCF ‘04) - increase seen in ASDEX (Cesario NF ‘92) • Scattering of LH waves from edge turbulence - broadening of LH spectra in ASDEX (Cesario NF ‘92) • Parametric decay instabiltity - seen on Alcator C with CO2 scattering (Takase PF ‘85) • Change of edge Er due to loss of fast electrons at edge • Pondermotive force on edge plasma near LH antenna

  3. Possible Experiments on C-Mod • Look for changes in edge turbulence with LH, and try to isolate cause (change in edge parameters ?) • Check effect of gas puff on LH coupling (as in JET) • Modulate LH power in turbulence frequency range (needs small change in amplifier) • Vary phasing of LH to spatially resonate with turbulence • Intentionally create fast electrons in edge to change Er

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