Guidelines for internal optics optimization of the ITER EC H&CD upper launcher

A. Moro, A. Bruschi, L. Figini, R. Chavan, D. Farina, T.P. Goodman, A. Krause, M.A. Henderson, J.D. Landis, P. Platania, G. Saibene, F. Sanchez Galan, C. Sozzi, M. Toussaint

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

The importance of localized injection of Electron Cyclotron waves to control Magneto-HydroDynamic instability is well assessed in tokamak physics and the set of four Electron Cyclotron (EC) Upper Launchers (UL) in ITER is mainly designed for this purpose. Each of the 4 ULs uses quasi-optical mirrors (shaping and planes, fixed and steerable) to redirect and focus 8 beams (in two rows, with power close to 1 MW per beam coming from the EC transmission lines) in the plasma region where the instability appears. Small beam dimensions and maximum beam superposition guarantee the necessary localization of the driven current. To achieve the goal of MHD stabilization with minimum EC power to preserve the energy confinement in the outer half of the plasma cross section, optimization of the quasi-optical design is required and a guideline of a strategy is presented. As a result of this process and following the guidelines indicated, modifications of the design (new mirrors positions, rotation axes and/or focal properties) will be proposed for the next step of an iterative process, including the mandatory compatibility check with the mechanical constraints. © 2014 AIP Publishing LLC.
Original languageEnglish
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event20th Topical Conference on Radiofrequency Power in Plasmas - , Italy
Duration: 1 Jan 2014 → …

Conference

Conference20th Topical Conference on Radiofrequency Power in Plasmas
CountryItaly
Period1/1/14 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Moro, A., Bruschi, A., Figini, L., Chavan, R., Farina, D., Goodman, T. P., ... Toussaint, M. (2014). Guidelines for internal optics optimization of the ITER EC H&CD upper launcher. Paper presented at 20th Topical Conference on Radiofrequency Power in Plasmas, Italy. https://doi.org/10.1063/1.4864610