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Proposing Institution

Max-Planck-Institut für Plasmaphysik
Project Manager

Dr. Dirk Wünderlich
Boltzmannstr. 2
85748 Garching bei München
RF driven sources for negative hydrogen or deuterium ions are an essential part of the neutral beam heating (NBI) system for the international fusion experiment ITER. At IPP Garching pioneering development work for these sources have been done and the RF-driven IPP prototype source is the reference source for the ITER NBI system. Currently operational at IPP are two test facilities, with the main aim of demonstrating that such systems can achieve the parameters required for the ITER source. The performance – mainly defined by the extracted negative ion current – achieved by such experiments is limited by the amount and the temporal instability of the co-extracted electrons, especially for operation in deuterium. Solely based on experimental investigations it is not possible to define measures for reducing the electron current and the application of models is mandatory. The 3D Particle-in-cell Monte Carlo code ONIX is the only code available that can be applied to both IPP test facilities, using the real geometry of the extraction system, the real 3D magnetic field topology and without any non-physical simplifications. ONIX will be used for predictive calculations of negative ion extraction and electron co-extraction from the ELISE test facility, focusing on three important physical effects. These calculations may have a strong impact on the development of such NBI ion sources for negative ions toward the application at ITER and DEMO.

Impressum, Conny Wendler