@article{oai:nifs-repository.repo.nii.ac.jp:00000130,
 author = {NAGAOKA,  Kenichi and NAGAOKA, Ken-ichi and ISOBE,  Mitsutaka and TOI,  Kazuo and GOTO,  Kazuyuki and OSAKABE,  Masaki and AKIYAMA,  Tsuyoshi and SUZUKI,  Chihiro and NISHIMURA,  Shin and TAKEIRI,  Yasuhiko and WATANABE,  Kiyomasa and MATSUOKA,  Keisuke and OKAMURA,  Shoichi and CHS, experimental group},
 journal = {Plasma and Fusion Research},
 month = {Jan},
 note = {A hybrid directional probe method both “thermal and Langmuir probe” was applied for fast ion measure- ments in the compact helical system. In order to obtain absolute values of fast ion density and power density, a calibration of the probe was performed using neutral hydrogen beam and a mixture beam of hydrogen and proton, of which beam current and energy were controlled. The conversion factor from temperature increase of the probe head to local power density and secondary electron emission yield was obtained. The density of fast ions was obtained by directional thermal probe (DTP) method inside the last closed flux surface, and the density ratio was nFastIon/nBulkPlasma = 2.7 × 10?3 at r/a = 0.9. The observation of the directional Langmuir probe (DLP) method is consistent with the DTP results.},
 title = {Calibrations of Fast Ion Flux Measurement Using a Hybrid Directional Probe},
 volume = {Vol.2},
 year = {2007}
}