Studies on absorption of EC waves in assisted startup experiment on FTU

G. Granucci, D. Ricci, D. Farina, L. Figini, D. Iraji, O. Tudisco, G. Ramponi, W. Bin

Research output: Contribution to conferencePaper

Abstract

Assistance of EC wave for plasma breakdown and current ramp up is the proposed scenario for the ITER case, characterized by low toroidal electric field. The experimental results on many tokamaks clearly indicate the capabilities of the proposed scheme to have a robust breakdown in ITER. The key aspect of this technique is the EC power required, strongly related to the absorption of the wave in the initial stage of plasma formation. This aspect is generally neglected due to the diagnostics difficulties in the plasma formation phase. As a consequence a multi-pass absorption scheme is usually considered reasonable, leading to a strong absorption after many reflections on the walls. The present study exploits the high temporal and spatial resolution of the fast scanning interferometer of FTU together with the measure of residual power obtained by a sniffer probe. The absorbed EC power is calculated considering also the polarization rotation and the subsequent mode conversion after incidence on the internal wall and compared with that derived from experimental data. The resulting EC power distribution can explain differences observed between perpendicular and oblique injection results, indicating future investigations to define ITER power requirements. © Owned by the authors, published by EDP Sciences, 2012.
Original languageEnglish
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event17th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2011 - , Netherlands
Duration: 1 Jan 2012 → …

Conference

Conference17th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2011
CountryNetherlands
Period1/1/12 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Granucci, G., Ricci, D., Farina, D., Figini, L., Iraji, D., Tudisco, O., ... Bin, W. (2012). Studies on absorption of EC waves in assisted startup experiment on FTU. Paper presented at 17th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2011, Netherlands. https://doi.org/10.1051/epjconf/20123202016