Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Observation of a Radial Current at a Plug/Barrier Cell in GAMMA10
Ken KajiwaraTeruo SaitoYoshinori TatematsuYasuhito KiwamotoHiraku AbeKiyokazu ItoMasao IshikawaKameo IshiiKiyoshi Yatsu
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2001 年 70 巻 2 号 p. 421-427

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This paper presents a picture of current flow relevant to the plug/barrier cell and an end plate installed on the end wall of the GAMMA 10 tandem mirror. Detailed analyses show that, during electron cyclotron resonance heating for plug potential formation, a net electron current flows through the end plate. In the plug/barrier cell, on the other hand, ion currents are detected during ECRH on ring electrodes newly installed near the side wall of the vacuum vessel. A part of the radial ion currents is connected to the axial net electron current flowing through the end plate. This indicates that a residual non-ambipolar diffusion still remains. The radial ion current in the plug/barrier cell includes another component that originates form the axial ion flux emanating from the central region. This suggests radial diffusion of ions during potential plugging.
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© The Physical Society of Japan 2001
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