Fast ion measurement using a hybrid directional probe in the large helical device.
A hybrid directional probe was newly installed in the large helical device for fast ion measurement. The collector of the probe mounts a thermocouple to estimate local power flux and can be also utilized as a collector of a conventional Langmuir probe; therefore, the hybrid directional probe can simultaneously measure both local power density flux and current flux at the same collector surface. The concept and design of the hybrid directional probe, the calibration of the power density measurement, and preliminary result of the fast ion measurement are presented.
Nagaoka
Kenichi
K
National Institute for Fusion Science, Toki 509-5292, Japan.
Watanabe
Kiyomasa Y
KY
Osakabe
Masaki
M
Takeiri
Yasuhiko
Y
Minami
Takashi
T
Toi
Kazuo
K
Isobe
Mitsutaka
M
Nishiura
Masaki
M
Ito
Takafumi
T
Ogawa
Kunihiro
K