Observation of the effects of radially sheared electric fields on the suppression of turbulent vortex structures and the associated transverse loss in GAMMA 10.
Vortexlike turbulent structures in hot-ion mode plasmas with several keV are observed in the case with a radially produced weak shear of electric fields E(r). However, a strong E(r) shear formation due to a high ion-confining potential phi(c) production clears up these vortices together with plasma-confinement improvement and disappearance of both drift-wave and turbulencelike Fourier spectral signals. These findings are based on three-time progress in phi(c) in comparison to phi(c) attained 1992-2002. The significant advance of phi(c) is well extended in line with proposed potential-formation physics scalings.
Cho
T
T
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
Yoshida
M
M
Kohagura
J
J
Hirata
M
M
Numakura
T
T
Higaki
H
H
Hojo
H
H
Ichimura
M
M
Ishii
K
K
Islam
K Md
KM
Itakura
A
A
Katanuma
I
I
Nakashima
Y
Y
Saito
T
T
Tatematsu
Y
Y
Yoshikawa
M
M
Kojima
Y
Y
Tokioka
S
S
Yokoyama
N
N
Tomii
Y
Y
Imai
T
T
Pastukhov
V P
VP
Miyoshi
S
S