Overview of the ITER EC upper launcher
- 8 April 2008
- journal article
- Published by IOP Publishing in Nuclear Fusion
Abstract
The ITER electron cyclotron (EC) upper port antenna (or launcher) is nearing completion of the detailed design stage and the final build-to-print design stage will soon start. The main objective of this launcher is to drive current locally to stabilize the neoclassical tearing modes (NTMs) (depositing ECCD inside of the island that forms on either the q = 3/2 or 2 rational magnetic flux surfaces) and control the sawtooth instability (deposit ECCD near the q = 1 surface). The launcher should be capable of steering the focused beam deposition location to the resonant flux surface over the range in which the q = 1, 3/2 and 2 surfaces are expected to be found for various plasma equilibria susceptible to the onset of NTMs and sawteeth. The aim of this paper is to provide the design status of the principal components that make up the launcher: port plug, mm-wave system and shield block components. The port plug represents the chamber that provides a rigid support structure that houses the mm-wave and shield blocks. The mm-wave system comprises the components used to guide the RF beams through the port plug structure and refocus the beams far into the plasma. The shield block components are used to attenuate the nuclear radiation from the burning plasma, protecting the fragile in-port components and reducing the neutron streaming through the port assembly. The design of these three subsystems is described; in addition, the relevant thermo-mechanical and electro-magnetic analyses are reviewed for critical design issues.This publication has 26 references indexed in Scilit:
- ITER ECRH-ECCD System Capabilities for Extended Physics ApplicationsFusion Science and Technology, 2007
- EU developments of the ITER ECRH systemFusion Engineering and Design, 2007
- Cross–machine benchmarking for ITER of neoclassical tearing mode stabilization by electron cyclotron current driveNuclear Fusion, 2006
- Sawtooth control in fusion plasmasPlasma Physics and Controlled Fusion, 2005
- Design Performance of Front Steering-Type Electron Cyclotron Launcher for ITERFusion Science and Technology, 2005
- Comparison of the performance of different options for the ITER ECRH Upper LauncherJournal of Physics: Conference Series, 2005
- Development of EC Launcher components for ITERJournal of Physics: Conference Series, 2005
- Structural integration studies for the ITER ECRH Upper LauncherJournal of Physics: Conference Series, 2005
- Effects of localized electron heating and current drive on the sawtooth periodNuclear Fusion, 2003
- High-Confinement Regime at HighValues Due to a Changed Behavior of the Neoclassical Tearing ModesPhysical Review Letters, 2001