Current clamp at zero level in JT-60U current hole plasmas.
It is found that no current is driven in a central region of a tokamak plasma once the central current density becomes nearly zero ("current hole"), in spite of high electric conductivity, at the current drive by a toroidal electric field and a radio-frequency wave in experiments on the JT-60U tokamak. This is a new, stiff, self-organized structure of a magnetic field in an axisymmetric toroidal plasma.
Fujita
T
T
Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Ibaraki-ken.
Suzuki
T
T
Oikawa
T
T
Isayama
A
A
Hatae
T
T
Naito
O
O
Sakamoto
Y
Y
Hayashi
N
N
Hamamatsu
K
K
Ide
S
S
Takenaga
H
H