ECR Plasma in a High Power Millimeter-Wave Beam (Report III) : Difference in Plasma Property by Axial and Radial Launches(Welding Physics, Process & Instrument)

概要

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In the production and heating of an ECR plasma in a simple mirror field by a high power millimeter-wave beam, it was found that the difference in the launching direction of the beam to a mirror field gave a remarkable influence to the plasma property. Radial distribution of the hot electron component was affected by the beam expansion in the plasma chamber and the position of the fundamental and the 2nd harmonic resonance zones. In the axial launch a bell-shape radial distribution of the plasma was typically observed, and in the radial launch a ring-shape distribution was obtained. In the former the fundamental resonance zone and in the latter the 2nd harmonic zone played an important role in the plasma production and heating. It was also clarified that in the build-up phase of the plsma, a dense fully ionized plasma with an electron density reaching to the cut-off frequency of the wave was easily obtained. A preliminary result of gas puffing during the power input indicated a comfortable effect of increasing the electron density and suppressing an unstable oscillation.
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