Abstract
A discharge cleaning experiment was carried out in JFT-2 tokamak by using a hydrogen plasma produced by electron cyclotron resonance (ECR) discharge. By the use of a 2.45 GHz, 2 kW CW microwave, a plasma with electron temperature of 4eV and density of 1.2 × 10 10cm −3 was produced. Under quasi-equilibrium conditions, a comparison between the ECR-DC and the Taylor discharge cleaning (TDC) was done by observing the partial pressures of CH 4, H 2O, and CO gases. The TDC was carried out with a plasma with electron temperature of 4.1 eV and density of 3.5 × 10 12cm −3 , produced with a pulse width of 10 ms and a repetition frequency of 0.67 Hz. Both cleaning methods were found to have an approximately equal cleaning effect. This shows the applicability of the ECR-DC to advanced tokamaks.
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