Ion heating and high-energy-particle production by ion-cyclotron heating in the large helical device
Ion-cyclotron heating was applied to the Large Helical Device. When the proton-cyclotron resonance was near the saddle point of the magnetic field-strength plane, strong ion-cyclotron damping occurred. Under these conditions efficient plasma heating was achieved for more than one minute. A high-energy ion tail was observed, and the effective tail temperature was determined by a balance between the wave acceleration and the electron-drag relaxation. There was no apparent sign of particle orbit loss effect in the investigated density range of 0.8-1.3x10(19) m(-3).
Mutoh
T
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292 Japan.
Kumazawa
R
Seki
T
Watari
T
Saito
K
Torii
Y
Hartmann
DA
Zhao
Y
Sasao
M
Isobe
M
Osakabe
M
Krasilnikov
AV
Ozaki
T
Narihara
K
Nagayama
Y
Inagaki
S
Shimpo
F
Nomura
G
Yokota
M
Akaishi
K
Ashikawa
N
de Vries P
Emoto
M
Funaba
H
Fukuyama
A
Goto
M