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P: Plasmaphysik

P 2: Entladungen I

P 2.7: Vortrag

Montag, 3. April 2000, 18:15–18:30, HS IX

Development of RF ion sources for negative hydrogen ions — •Eckehart Speth¹, Bernd Heinemann¹, Werner Kraus¹, Paul McNeely¹, Rudolf Riedl¹, Otto Vollmer¹, Peter Massmann², and Rusty Trainham² — ¹Max-Planck-Institut fuer Plasmaphysik 85748 Garching, Germany, Euratom Association — ²CEA Cadarache, 13108 Saint Paul lez Durance, Fance, Euratom Association

RF ion sources have been used or considered in various technological areas in the last 20 years. In fusion research the main incentive for the application of rf sources in neutral beam heating systems is the absence of filaments, a potential advantage for ITER (and a fusion reactor) due to reduced maintenance and cost. In a collaboration between CEA Cadarache and IPP Garching an rf source for negative ions is presently under development. Stable operation with high rf power (up to 150 kW) and low pressure (0.6 Pa) has been demonstrated in a new type of rf source recently with significant negative ion yield. The paper will present the actual source design as well as the experimental results and discuss the various factors influencing the negative ion yield and the plans for future optimisation.