Preliminary design of the ITER ECH Upper Launcher

TitlePreliminary design of the ITER ECH Upper Launcher
Publication TypeJournal Article
Year of Publication2013
AuthorsD. Strauss, G. Aiello, R. Chavan, S. Cirant, M. de Baar, D. Farina, G. Gantenbein, T.P Goodman, M.A Henderson, W. Kasparek, K. Kleefeldt, J.D Landis, A. Meier, A. Moro, P. Platania, B. Plaum, E. Poli, G. Ramponi, D. Ronden, G. Saibene, F. Sanchez, O. Sauter, T. Scherer, S. Schreck, A. Serikov, C. Sozzi, P. Spaeh, A. Vaccaro, H. Zohm
JournalFusion Engineering and Design
Pagination2761 - 2766
KeywordsDiamond windows, Electron cyclotron heating, ITER, mm-Wave optics, Prototyping, Testing

Abstract The design of the ITER electron cyclotron launchers recently reached the preliminary design level - the last major milestone before design finalization. The ITER ECH system contains 24 installed gyrotrons providing a maximum ECH injected power of 20 MW through transmission lines towards the tokamak. There are two EC launcher types both using a front steering mirror; one equatorial launcher (EL) for plasma heating and four upper launchers (UL) for plasma mode stabilization (neoclassical tearing modes and the sawtooth instability). A wide steering angle range of the ULs allows focusing of the beam on magnetic islands which are expected on the rational magnetic flux surfaces q = 1 (sawtooth instability), q = 3/2 and q = 2 (NTMs). In this paper the preliminary design of the ITER ECH UL is presented, including the optical system and the structural components. Highlights of the design include the torus CVD-diamond windows, the frictionless, front steering mechanism and the plasma facing blanket shield module (BSM). Numerical simulations as well as prototype tests are used to verify the design.







Alternate TitleFusion Eng. Des.

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