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Lower hybrid current drive in the presence of a DC electric field

T. Okazaki, M. Sugihara, N. Fujisawa1986年被引用 7Nuclear FusionIF 3出版社

A code for numerical modelling of lower hybrid current drive has been developed which takes into account the DC electric field. The model is based on the Fokker-Planck equation, the plasma circuit equation and the power balance equations. The flow of power supplied by the RF waves and the OH coil (transformer) is investigated. Also studied are the current drive efficiency and the ramp-up efficiency, which is the ratio of RF energy to plasma electromagnetic energy. The ramp-up rate of the plasma current is slower and the RF power required for recharging the OH coil is higher when the DC electric field is taken into account than when it is neglected. The simulation results agree well with the results of Alcator C experiments. The RF energy and the time for ramp-up and recharge required for the next-generation tokamak are estimated.

日本語訳

低混合同軸電流駆動の数値モデリングのためのコードが開発され、直流電界を考慮に入れている。このモデルは、フォッカー・プランク方程式、プラズマ平衡方程式、およびパワーバランス方程式に基づいている。RF波とOH(オーミック加熱)トランスによって供給される電力の流れが調査されている。また、電流駆動効率と立ち上げ効率(RFエネルギーのプラズマ電磁エネルギーに対する比)についても研究されている。直流電界を考慮した場合、考慮しない場合と比較して、プラズマ電流の立ち上げ速度は遅く、OHトランスを再充電するために必要なRF電力は高い。シミュレーション結果は、アルカトールC実験の結果とよく一致している。次世代トカマクに必要な立ち上げおよび再充電のためのRFエネルギーと時間が見積もられている。

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Current driveLower hybridLower hybrid current drive
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