@techreport{oai:nifs-repository.repo.nii.ac.jp:00009553,
 author = {Fujisawa,  A. and Iguchi,  H. and Minami,  T. and Yoshimura,  Y. and Sanuki,  H. and Itoh,  K. and Isobe,  M. and Nishimura,  S. and Tanaka,  K. and Osakabe,  M. and Nomura,  I. and Ida,  K. and Okamura,  S. and Toi,  K. and Kado,  S. and Akiyama,  R. and Shimizu,  A. and Takahashi,  C. and Kojima,  M. and Matsuoka,  K. and Hamada,  Y. and Fujiwara,  M.},
 month = {Sep},
 note = {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.},
 title = {Observation of Bifurcation Property of Radial Electric Field Using a Heavy Ion Beam Probe},
 year = {2000}
}