On the NBI system for substantial current drive in a fusion power plant: Status and R&D needs for ion source and laser neutralizer |
| |
| Affiliation: | 1. ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul-lez-Durance, France;2. D.V. Efremov Scientific Research Institute, 196641 St. Petersburg, Russia;1. Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland;2. Trzebiatowski Institute of Low Temperatures and Structure Research PAS, Okolna Str. 2 P.O. Box 1410, 50-950 Wrocław, Poland;1. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain;2. Institut für Kernchemie, Johannes Gutenberg-Universität, 55099 Mainz, Germany;3. GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany;4. SHE Chemistry section, Helmholtz-Institut Mainz, 55099 Mainz, Germany |
| |
| Abstract: | The requirements for the heating and current drive systems of a fusion power plant will strongly depend on the DEMO scenario. The paper discusses the R&D needs for a neutral beam injection system — being a candidate due to the highest current drive efficiency — for the most demanding scenario, a steady state tokamak DEMO. Most important issues are the improvement of the wall-plug efficiency from the present ∼25% to the required 50–60% by improving the neutralization efficiency with a laser neutralizer system and the improvement of the reliability of the ion source operation. The demands on and the potential of decreasing the ion source operation pressure, as well as decreasing the amount of co-extracted electrons and backstreaming ions are discussed using the ITER requirements and solutions as basis. A further concern is the necessity of cesium for which either the cesium management must be improved or alternatives to cesium for the production of negative ions have to be identified. |
| |
| Keywords: | DEMO Neutral beam system Current drive RF driven negative hydrogen ion sources Photo neutralizer |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
