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Accelerating the magnetic island by the modulated resonant magnetic perturbation for the disruption avoidance on J-TEXT

Da Li, Nengchao Wang, Yonghua Ding, Qingquan Yu, Mao Li, Qiming Hu, Ying He, Feiyue Mao, Chengshuo Shen, Ruo Jia2022年Plasma Physics and Controlled FusionIF 2.2出版社

The acceleration of the magnetic island rotation by the modulated resonant magnetic perturbation (MRMP) has been studied in J-TEXT tokamak experiments. After applying the MRMP, the phase difference between the tearing mode (TM) and MRMP, Δξ, oscillated near the effective phase difference, Δξeff, which was defined as the time averaged value of Δξ. When the Δξeff was closed to the—π/2, the MRMP only contributed an accelerating torque on the TM. As the result, the TM rotation frequency was increased by a few kilohertz for the optimized relative phase by small RMPs of the order of 10−5 of the toroidal field and the locked mode induced disruption was avoided. It is found that the TM rotation could be increased to a higher frequency by applying a stronger MRMP. There is a negative sinusoidal relationship between TM frequency and Δξeff.

日本語訳

J-TEXTトカマク実験において、変調共鳴磁気摂動(MRMP)による磁気島回転の加速が研究された。MRMP印加後、ティアリングモード(TM)とMRMPの間の位相差Δξは、時間平均値として定義される実効位相差Δξeffの近傍で振動した。Δξeffが-π/2に近いとき、MRMPはTMに対して加速トルクのみを及ぼした。その結果、最適化された相対位相において、トロイダル磁場の10⁻⁵のオーダーの小さなRMPにより、TM回転周波数は数kHz増加し、ロックモード誘起ディスラプションが回避された。より強いMRMPを印加することで、TM回転をより高い周波数まで増加させ得ることが見出された。TM回転周波数とΔξeffの間には負の正弦関数的関係が存在する。

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Plasma disruptionMagnetic perturbationResonant magnetic perturbationMagnetic islandsTEXTJ-TEXT
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