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Title: Guidelines for internal optics optimization of the ITER EC H and CD upper launcher

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.
Authors:
; ; ; ; ;  [1] ; ; ; ; ; ;  [2] ;  [3] ;  [4]
  1. Istituto di Fisica del Plasma CNR, Euratom-ENEA Association, 20125 Milano (Italy)
  2. Centre de Recherches en Physique des Plasmas, CRPP-EPFL, CH-1015 Lausanne (Switzerland)
  3. ITER Organization, 13108 Saint-Paul-lez-Durance (France)
  4. Fusion for Energy, Barcelona (Spain)
Publication Date:
OSTI Identifier:
22263909
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1580; Journal Issue: 1; Conference: 20. topical conference on radiofrequency power in plasmas, Sorrento (Italy), 25-28 Jun 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONTROL; CROSS SECTIONS; CYCLOTRONS; ITER TOKAMAK; MAGNETOHYDRODYNAMICS; PLASMA