@article{oai:nifs-repository.repo.nii.ac.jp:00000400,
 author = {Ido,  Takeshi and Shimizu,  Akihiro and Nishiura,  Masaki and Nakano,  Haruhisa and Ohshima,  Shinsuke and Kato,  Shinji and Hamada,  Yasuji and Yoshimura,  Yasuo and Kubo,  Shin and Shimozuma,  Takashi and Igami,  Hiroe and Takahashi,  Hiromi and Toi,  Kazuo and Watanabe,  Fumitake},
 journal = {Review of Scientific Instruments},
 month = {Jan},
 note = {Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.},
 title = {Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device},
 volume = {Vol.79},
 year = {2008}
}