@techreport{oai:nifs-repository.repo.nii.ac.jp:00010328,
 author = {"Toi,  K. and Morita,  S. and Kawahata,  K. and Ida,  K. and Watari,  T. and Kumazawa,  R. and Ando,  A. and Oka,  Y. and Ohkubo,  K. and Hamada,  Y. and Adati,  K. and Akiyama,  R. and Hidekuma,  S. and Hirokura,  S. and Kaneko,  O. and Kawamoto,  T. and Kawasumi,  Y. and Kojima,  M. and Kuroda,  T. and Masai,  K. and Narihara,  K. and Ogawa,  Y. and Okajima,  S. and Sakamoto,  M. and Sasao,  M. and Sato,  K. and Sato,  K. N. and Seki,  T. and Shimpo,  F. and Tanahashi,  S. and Taniguchi,  Y. and Tsuzuki,  T."},
 month = {Sep},
 note = {"In limiter H-modes of JIPP T-IIU, a new type of L-H transition preceded by an ELM is observed. The preceding ELM ( pre-ELM ) appears just prior to the L-H transition. This type of transition is usually observed in H-modes of JIPP T-IIU. The L-H transition without the pre-ELM is triggered only in the case when a sufficiently large rapid current ramp down is emploied. In H-modes with constant q(a)~3.5-4.5, coherent magnetic oscillations with m=3 /n=1 destabilized during L-phase are further enhanced at the pre-ELM, and suppressed suddenly at the transition. This mode is situated in the region of the transport barrier. Propagation frequency of the m=3/n=1 mode, which may be affected by plasma mass rotation, rises appreciably ( by ~ 10 % ) during H-phase with frequent ELMs, but remains unchanged for at least 200 mu s after the transition. Behaviours of the m=3/n=1 and m=2/n=1 modes are well explained by quasi-linear resistive tearing mode analysis for modelled toroidal current density profiles slightly detached from the limiter. These experimental results suggest that the transition is controlled by the change of a magnetic field structure relating to the modification of a toroidal current density profile near the edge. The possibility for the development of edge radial electric field as a consequence of the transition is discussed."},
 title = {New Features of L-H Transition in Limiter H-Modes of JIPP T-IIU},
 year = {1992}
}