電子サイクロトロン共鳴プラズマを用いる放電洗浄実験 (JFT-2装置)

概要

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Adischarge cleaning experiment was carried out in JFT-2 Tokamak by using a low electron temperature plasma of hydrogen produced by electron cyclotron resonance (ECR) discharge. By the use of 2.45 GHz, 2 kW cw microwave. The electron temperature and density of the plasma were typically 4 eV and 1.2 x 1010 cm-3 respectively. Under quasi-equilibrium condition, comparison between the ECR discharge cleaning and the Taylor discharge cleaning (TDC) was done by observing the partial pressures of CH4, H2O and CO gases. The TDC was carried out with a plasma with electron temperature of 4.1 eV and density of 3.5 x 1012 cm-3, produced with a pulse width of 10 ms and a repetition frequency of 0.67 Hz. Both cleaning methods were found to have the approximately equal cleaning effect. This shows the applicability of the ECR-DC to advanced Tokamaks.