@techreport{oai:nifs-repository.repo.nii.ac.jp:00009554,
 author = {Fujisawa,  A. and Iguchi,  H. and Sanuki,  H. and Itoh,  K. and Lee,  S. and Hamada,  Y. and Kubo,  S. and Idei,  H. and Akiyama,  R. and Tanaka,  K. and Minami,  T. and Ida,  K. and Nishimura,  S. and Morita,  S. and Kojima,  M. and Hidekuma,  S. and Itoh,  S.-I. and Takahashi,  C. and Inoue,  N. and Suzuki,  H. and Okamura,  S. and Matsuoka,  K.},
 month = {Apr},
 note = {During a combined heating phase of ECH and NBI, an abrupt drop and rise in potential by about a half of central electron temperature (~ 400 V) was observed in the core of the CHS heliotron/torsatron plasma. Drastic changes of radial electric field between positive and negative states occur in 50 mu s at shortest, which is much shorter than the energy confinement time scale of about a few milliseconds. Nonlinear relation between the radial electric field and radial current is obtained. This is the first experimental observation of a spontaneous transition based on an electric field bifurcation in microseconds order in toroidal helical plasmas.},
 title = {Dynamic Behavior of Potential in the Plasma Core of the CHS Heliotron/Torsatron},
 year = {1997}
}