@techreport{oai:nifs-repository.repo.nii.ac.jp:00010330,
 author = {"Toi,  K. and Okamura,  S. and Iguchi,  H. and Yamada,  H. and Morita,  S. and Sakakibara,  S. and Ida,  K. and Nishimura,  K. and Matsuoka,  K. and Akiyama,  R. and Arimoto,  H. and Fujiwara,  M. and Hosokawa,  M. and Idei,  H. and Kaneko,  O. and Kubo,  S. and Sagara,  A. and Takahashi,  C. and Takeiri,  Y. and Takita,  Y. and Tsumori,  K. and Yamada,  I. and Zushi,  H."},
 month = {Oct},
 note = {"Control of rotational transform profile with a small ohmic heating ( OH-) current to increase the rotational transform has led to a continuous rise in the line-averaged electron density with reduction of H alpha-lights around the torus, in a heliotron/torsatron plasma heated by neutral beams. During the density rise, the transport barrier with steep temperature and density gradients near the plasma edge has been formed. Edge localized modes ( ELM )-like activity is also observed. Incoherent magnetic fluctuations in the frequency range f > 20 kHz are clearly suppressed during the density rise phase, while low frequency coherent part remains almost unchanged. Global energy confinement time in the density rise phase is improved by ~15 %, compared with that of the discharge without the OH-current. These experimental observations are very similar to the H-mode in tokamaks. There is a threshold of the current for the transition, where the increment of rotational transform by the threshold current corresponds to ~ 0.1 at the edge. No obvious increase in the edge poloidal rotation velocity, however, is observed during the density rise phase, that is, at most ~ 3 km/s."},
 title = {Formation of H-mode Like Transport Barrier in the CHS Heliotron / Torsatron},
 year = {1992}
}