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Author(s):
Y. Hamada, K.N. Sato, H. Sakakita, A. Nishizawa, Y. Kawasumi, R. Liang, K. Kawahata, A. Ejiri, K. Toi, K. Narihara, K. Sato, T. Seki, H. Iguchi, A. Fujisawa, K. Adachi, S. Hidekuma,
S. Hirokura, K. Ida, M. Kojima, J. Koong, R. Kumazawa, H. Kuramoto, T. Minami,. M. Sasao, T. Tsuzuki, J.Xu, I. Yamada, and T. Watari
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Title:
Large Potential Change Induced by Pellet Injection in JIPP T-IIU Tokamak Plasmas
Date of publication:
May 1995
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Key words:
tokamak, pellet injection, HIBP, potential, beam, ablation
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Abstract:
A large, rapid change in the local plasma potential is found to be induced by off-axis hydrogen ice-pellet injection into a tokamak plasma. The polarity of the rapid change is reversed when the pellet is injected into the upper and lower halves of the poloidal plasma cross-section. This change can be interpreted as being due to the gradient-B drift of particles in the high-density plasmas of the pellet cloud, before the increase of the plasma density due to the ablation becomes uniform on the magnetic surface.
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