@article{oai:nifs-repository.repo.nii.ac.jp:00000223,
 author = {Kasahara,  H. and Seki,  T. and Saito,  K. and Seki,  R. and Kumazawa,  R. and Yoshimura,  Y. and Kubo,  S. and Shimozuma,  T. and Igami,  H. and Takahashi,  H. and Nagasaki,  K. and Ueda,  Y. and Tokitani,  M. and Ashikawa,  N. and Shoji,  M. and Wakatsuki,  T. and Kamio,  S. and Tsuchiya,  H. and Yoshimura,  S. and Tamura,  N. and Suzuki,  C. and Yamada,  H. and Muto,  T. and LHD, Experiment Group},
 journal = {Physics of Plasmas},
 month = {Jan},
 note = {Using a handshake shape (HAS) antenna phasing dipole for ion cyclotron heating (ICH), the heating efficiency was higher than that using a previous poloidal array antenna in the Large Helical Device. In order to sustain the dipole operation, real-time feedback for impedance matching and maintaining the same phase and power was adopted during long-pulse discharge. The HAS antenna was designed to reduce parasitic losses associated with energetic particle and radio-frequency (RF) sheath effects by field-aligned current concentration on the midplane. Local hot spots and the inhomogeneity of the diverter heat profile in the toroidal direction were reduced. The long-pulse discharge with an electron density (n e0) of 1?×?1019 m?3, center electron temperature (T e0) of 2.5?keV, a plasma duration time (t d) of 19?min, and RF heating power (P RF ) of 1?MW was achieved by ICH and electron cyclotron heating.},
 title = {Development of steady-state operation using ion cyclotron heating in the Large Helical Device},
 volume = {Vol.21},
 year = {2014}
}