|Title||Preliminary design of the ITER ECH Upper Launcher|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||D. 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|
|Journal||Fusion Engineering and Design|
|Pagination||2761 - 2766|
|Keywords||Diamond 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 Title||Fusion Eng. Des.|
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