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Electron cyclotron current drive under neutral beam injection on HL-2M

Yijun Zhong, Qianhong Huang, Xueyu Gong, Qingyi Tan, Peng Yu, Guang Yang, Pingwei Zheng, Lan Yin, Tao Yang, Zhanhui Wang2022年被引用 4Nuclear FusionIF 3出版社

Based on OMFIT framework and HL-2M parameters, this paper comprehensively considers the changes in plasma density, temperature, and other transport quantities caused by the interaction of neutral beam injection (NBI) and electron cyclotron wave (ECW) with plasma. The changes in the Shafranov shift of the plasma magnetic surface center are also evaluated. Theoretically, the influence of NBI on the deposition location and current drive efficiency of the ECW is studied. According to the findings, NBI affected the position location and efficiency of the electron cyclotron current drive (ECCD) deposited on both high field side (HFS) and low field side (LFS). NBI can relocate the ECW power deposition location to the core and increase the current drive efficiency when the ECW power is deposited on the LFS. When the NBI power increases to 7 MW, the ECCD deposition location can shift to the core by roughly 0.15 normalized small radii, and the current drive efficiency can be improved by 1.3 times. Moreover, as NBI power increases, the radial region where the dimensionless current drive efficiency equals to zero gets closer to the plasma edge. When ECW power is deposited on the HFS paraxial, increasing NBI power causes the ECW deposition location to move toward the plasma edge, thus lowering current drive efficiency. This trend is caused by an increase in NBI power, which can increase the Shafranov shift of the plasma center, increase the electron density, and change the electron temperature. These studies hold great significance for achieving more effective current drive and controlling the plasma current profile and neoclassical tearing mode instability.

日本語訳

OMFITフレームワークとHL-2Mパラメータに基づき、本論文では中性粒子ビーム入射(NBI)と電子サイクロトロン波(ECW)のプラズマとの相互作用によって引き起こされるプラズマ密度、温度、その他の輸送量の変化を総合的に考察する。また、プラズマ磁気面中心のシャフラノフシフトの変化も評価する。理論的には、NBIがECWの堆積位置と電流駆動効率に及ぼす影響を研究する。結果によれば、NBIは高磁場側(HFS)と低磁場側(LFS)の両方に堆積する電子サイクロトロン電流駆動(ECCD)の位置と効率に影響を与える。ECWパワーがLFSに堆積する場合、NBIはECWパワーの堆積位置をプラズマ中心部へ移動させ、電流駆動効率を向上させることができる。NBIパワーが7 MWに増加すると、ECCDの堆積位置は約0.15規格化小半径だけ中心部へシフトし、電流駆動効率は1.3倍に向上する。さらに、NBIパワーの増加に伴い、無次元電流駆動効率がゼロとなる動径領域はプラズマ端に近づく。ECWパワーがHFS軸付近に堆積する場合、NBIパワーの増加はECWの堆積位置をプラズマ端方向へ移動させ、電流駆動効率を低下させる。この傾向は、NBIパワーの増加がプラズマ中心のシャフラノフシフトを増大させ、電子密度を上昇させ、電子温度を変化させることに起因する。これらの研究は、より効果的な電流駆動を実現し、プラズマ電流分布と新古典テアリングモード不安定性を制御する上で重要な意義を持つ。

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Current driveNeutral beamNeutral beam injectionElectron cyclotron current driveHL-2M
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