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The poloidal rotation velocity of neutral hydrogen atoms is measured using the Doppler shift of the Hα spectral line emitted in the CT-6B tokamak. The poloidal rotation of hydrogen atoms is generated through the collisions and charge-exchanges with main ions (protons). Therefore, the rotation direction of main ions can be deduced from that of neutral hydrogen atoms. The experimental results show that the main ions rotate in the electron diamagnetic drift direction, the same as the impurity ions, in the plasma core. The neutral hydrogen atoms rotate also in the electron diamagnetic drift direction in the edge region of the plasma. However, the rotation direction of main ions in the edge region cannot be judged from the experimental result due to the long mean free path of hydrogen atoms in the edge region. An inward diffusion flux of hydrogen atoms toward the torus inside with a velocity of the same order of magnitude as their poloidal rotation is also observed. 相似文献
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本文利用磁探针阵测量清洗放电前MUT托卡马克中角向磁场的分布,从而计算得到了等离子体的电流分布。结果表明,在清洗放电初期,由于存在大量杂质,等离子体的横向扩散非常大,因而。真空室的绝缘段几乎不起绝缘作用,此时所测到的环向电流中绝大部分是流经厚壁真空室的电流。 相似文献