Probing internal transport barriers with heat pulses in JET.
The first electron temperature modulation experiments in plasmas characterized by strong and long-lasting electron and ion internal transport barriers (ITB) have been performed in JET using ion cyclotron resonance heating in mode conversion scheme. The ITB is shown to be a well localized narrow layer with low heat diffusivity, characterized by subcritical transport and loss of stiffness. In addition, results from cold pulse propagation experiments suggest a second order transition process for ITB formation.
Mantica
P
P
Istituto di Fisica del Plasma P.Caldirola, Associazione Euratom-ENEA-CNR, Milano, Italy.
Van Eester
D
D
Garbet
X
X
Imbeaux
F
F
Laborde
L
L
Mantsinen
M
M
Marinoni
A
A
Mazon
D
D
Moreau
D
D
Hawkes
N
N
Joffrin
E
E
Kiptily
V
V
Pinches
S
S
Salmi
A
A
Sharapov
S
S
Thyagaraja
A
A
Voitsekhovitch
I
I
de Vries
P
P
Zastrow
K-D
KD