Plasma Experiments Using a New 170 GHz EC System and a Simple Model for Plasma Production on the TRIAM-1M

概要

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An electron cyclotron heating (ECH) system has been installed on the TRIAM-1M tokamak, which produces a 170GHz microwave up to 260kW at the window of the gyrotron for 5sec. After the Matching Optical Unit (MOU) converts the microwave to a Gaussian beam, a microwave power of 200kW is transmitted by a corrugated waveguide of 63.5mm in diameter. Tests confirmed these specifications, and the fundamental ordinary electron cyclotron (EC) wave of 170GHz up to 120kW was injected into the vacuum vessel of the TRIAM-1M in order to ionize neutral hydrogen gas to make source plasma, which is expected to reduce flux consumption in the case of current start-up by means of Ohmic heating (OH) coils. Though the breakdown does not occur at the input RF power, P_<RF>=40kW with the neutral gas pressure, p=1.3×10^<-3> Pa, high-density plasma (more than 0.7×10^<19>m^<-3>) is produced at P_<RF>=100kW. In the range of P_<RF>=40-100kW, the electron density is proportional to P_<RF>.
社団法人プラズマ・核融合学会の論文
2004-01-25