A. Fujisawa et al 2001 Nucl. Fusion 41 575 doi:10.1088/0029-5515/41/5/310
Observation of bifurcation properties of radial electric fields using a heavy ion beam probe
A. Fujisawa, H. Iguchi, T. Minami, Y. Yoshimura, H. Sanuki, K. Itoh, M. Isobe, S. Nishimura, C. Suzuki, K. Tanaka, M. Osakabe, I. Nomura, K. Ida, S. Okamura, K. Toi, S. Kado, R. Akiyama, A. Shimizu, C. Takahashi, M. Kojima, S.-I. Itoh*, K. Matsuoka, Y. Hamada and M. Fujiwara
Show affiliationsThe bifurcated nature of the potential profile of a toroidal helical plasma is investigated in CHS using a heavy ion beam probe. The measurements reveal that three main branches of potential profile exist in ECR heated plasmas with a low density of 
e ≈ 0.5 × 1019m-3. The branches with higher central potential exhibit a rather strong radial electric field shear that should result in fluctuation reduction and formation of a transport barrier. An analysis of the pulsating behaviour in the potential suggests the existence of a fine structure in the potential profiles between the main branches. Lissajous and histogram expressions are useful in extracting the bifurcation characteristics of the potential structure.
- PACS
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52.70.Ds Electric and magnetic measurements
52.25.Gj Fluctuation and chaos phenomena
52.50.Sw Plasma heating by microwaves; ECR, LH, collisional heating
- Subjects
- Dates
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Issue 5 (May 2001)
Received 4 October 2000, accepted for publication 26 January 2001
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Observation of bifurcation properties of radial electric fields using a heavy ion beam probe
A. Fujisawa et al 2001 Nucl. Fusion 41 575
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