@techreport{oai:nifs-repository.repo.nii.ac.jp:00010325,
 author = {"Toi,  K. and Hamada,  Y. and Kawahata,  K. and Watari,  T. and Ando,  A. and Ida,  K. and Morita,  S. and Kumazawa,  R. and Oka,  Y. and Masai,  K. and Sakamoto,  M. and Adati,  K. and Akiyama,  R. and Hidekuma,  S. and Hirokura,  S. and Kaneko,  O. and Karita,  A. and Kawamoto,  T. and Kawasumi,  Y. and Kojima,  M. and Kuroda,  T. and Narihara,  K. and Ogawa,  Y. and Ohkubo,  K. and Okajima,  S. and Ozaki,  T. and Sasao,  M. and Sato,  K. and Sato,  K.N. and Seki,  T. and Shimpo,  F. and Takahashi,  H. and Tanahashi,  S. and Taniguchi,  Y. and Tsuzuki,  T."},
 month = {Sep},
 note = {"Two types of improved confinement regimes, H-mode and lOC( improved ohmic confinement)-mode, are studied in circular-limiter plasmas on JIPP T-IIU. When the rapid ramp-down of plasma current ( CRD ) is employed during auxiliary heating, the threshold heating power required for the L-H transition is reduced by 30-50 %, compared with that in the case without CRD. This is interpreted to be due to enhancement of the global magnetic shear near the plasma edge by CRD. This model based on edge magnetic shear is also applicable to the limiter H-mode obtained without CRD by high heating power. In the limiter configuration, improved confinement regime, lOC-mode, is obtained in ohmically heated high density plasmas by gas puff control. This improvement may be attributed to reduction of anomalous transport, since radiation loss has only minor effect."},
 title = {Study of Limiter H- and IOC- Modes by Control of Edge Magnetic Shear and Gas Puffing in the JIPP T-IIU Tokamak},
 year = {1990}
}