Current Drive in Magnetically Confined Fusion Plasmas by Beat-Waves Generated with Collinear High-Frequency Electromagnetic Waves

摘要

The feasibility was investigated of a current drive technique based on the collinear excitation of plasma waves by two high-frequency electromagnetic pump waves. Particle trapping into the intense plasma wave creates hot electrons which sustain a slowly decaying current. Momentum and energy transfer to electrons can be enhanced by pump wave cascading. The method offers possibilities to localize the generation region and to control the current profile. A method is suggested to amplify the induced current by the bootstrap effect. A seed current 0.2 - 0.4MA in a 30 - 50 cm diameter spot would be sufficient in a tokamak reactor and it appears achievable as regards laser requirements.