Microwave preionization of the tokamak discharge at the electron cyclotron resonance |
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Authors: | T Ocho S Kubo M Ikeda T Saito Y Terumichi Y Hamada S Tanaka |
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Institution: | Department of Physics, Faculty of Science, Kyoto University, Kyoto 606, Japan |
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Abstract: | When ohmic heating power is applied during the microwave discharge at the electron cyclotron resonance, the plasma current and density build-up become fast and the loop voltage required to start the tokamak discharge decreases. The micro-wave burst observed in the initial stage is reduced and the burst of hard X-rays, occurring at the quasi-steady stage of discharge in the case of no microwave injection, disappears, suggesting that the production of run-away electrons is suppressed strongly. |
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