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Author(s):
Fujisawa, A., Iguchi, H., Minami, T., Yoshimura, Y., Sanuki, H., Itoh, K., Isobe, M., Nishimura, S., Tanaka, K., Osakabe, M., Nomura, I., Ida, K., Okamura, S., Toi, K., Kado, S., Akiyama, R., Shimizu, A., Takahashi, C., Kojima, M., Matsuoka, K., Hamada, Y., Fujiwara, M.
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Title:
Observation of Bifurcation Property of Radial Electric Field Using a Heavy Ion Beam Probe
Date of publication:
Sep. 2000
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Key words:
IAEA, fusion energy conference, Sorrento
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Abstract:
Bifurcation nature of potential profile of a toroidal helical plasma is investigated in the Compact Helical System (CHS), using a heavy ion beam probe. The measurements reveal that there exist three main branches of potential profiles in electron cyclotron resonance (ECR) heated plasmas with low density of n_e~0.5 x l0^13 cm^-3. The branches with higher central potential exhibit a rather strong radial electric field shear that should result in fluctuation reduction and formation of transport barrier. Lissajous expression is useful to extract the bifurcation characteristics of potential structure.
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