Observation of toroidal flow antiparallel to the <E(r) x B(straight theta)> drift direction in the hot electron mode plasmas in the compact helical system.
A toroidal flow antiparallel to the <E(r) x B(straight theta)> drift direction is observed in the hot electron mode plasmas when a large positive electric field and a sharp electron temperature gradient are sustained inside the internal transport barrier in the Compact Helical System. This toroidal flow reaches up to 5x10(4) m/s at the plasma center, and it is large enough to reverse the toroidal flow driven by a tangentially injected neutral beam. These observations clearly show the plasma favors flow in the minimum nablaB direction at the transport barrier.
Ida
K
K
National Institute for Fusion Science, Toki 509-5292, Japan.
Minami
T
T
Yoshimura
Y
Y
Fujisawa
A
A
Suzuki
C
C
Okamura
S
S
Nishimura
S
S
Isobe
M
M
Iguchi
H
H
Itoh
K
K
Kado
S
S
Liang
Y
Y
Nomura
I
I
Osakabe
M
M
Takahashi
C
C
Tanaka
K
K
Matsuoka
K
K