Ion heat transport studies in JET
Journal article, 2011
Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with (3)He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known omega(ExB) threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T(e)/T(i) and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.
thermal transport
tokamaks
t-e/t-i
ratio
instabilities
asdex upgrade
shear
turbulence simulations
confinement
h-mode plasmas
Author
P. Mantica
ENEA
EFDA-JET
C. Angioni
Max Planck Society
EFDA-JET
B. Baiocchi
ENEA
EFDA-JET
University of Milan
M. Baruzzo
EFDA-JET
Consorzio Rfx
M. N. A. Beurskens
EFDA-JET
Culham Science Centre
J. P. S. Bizarro
EFDA-JET
Instituto Superior Tecnico
R. V. Budny
Princeton University
EFDA-JET
P. Buratti
EFDA-JET
ENEA
A. Casati
The French Alternative Energies and Atomic Energy Commission (CEA)
EFDA-JET
C. Challis
EFDA-JET
Culham Science Centre
J. Citrin
EFDA-JET
FOM Institute for Plasma Physics - Rijnhuizen
G. Colyer
Culham Science Centre
EFDA-JET
F. Crisanti
ENEA
EFDA-JET
A. C. A. Figueiredo
Instituto Superior Tecnico
EFDA-JET
L. Frassinetti
EFDA-JET
EES
C. Giroud
Culham Science Centre
EFDA-JET
N. Hawkes
EFDA-JET
Culham Science Centre
J. Hobirk
EFDA-JET
Max Planck Society
E. Joffrin
The French Alternative Energies and Atomic Energy Commission (CEA)
EFDA-JET
T. Johnson
EES
EFDA-JET
E. Lerche
EFDA-JET
Royal Military Academy
P. Migliano
University of Milano-Bicocca
EFDA-JET
ENEA
V. Naulin
EFDA-JET
Technical University of Denmark (DTU)
A. G. Peeters
University of Bayreuth
EFDA-JET
G. Rewoldt
Princeton University
EFDA-JET
F. Ryter
EFDA-JET
Max Planck Society
A. Salmi
Aalto University
EFDA-JET
R. Sartori
Fusion for Energy Joint Undertaking
EFDA-JET
C. Sozzi
ENEA
EFDA-JET
G. Staebler
General Atomics
EFDA-JET
D. Strintzi
EFDA-JET
Max Planck Society
T. Tala
Technical Research Centre of Finland (VTT)
EFDA-JET
M. Tsalas
EFDA-JET
FOM Institute for Plasma Physics - Rijnhuizen
D. Van Eester
EFDA-JET
Royal Military Academy
T. Versloot
FOM Institute for Plasma Physics - Rijnhuizen
EFDA-JET
P. C. de Vries
EFDA-JET
FOM Institute for Plasma Physics - Rijnhuizen
Jan Weiland
Chalmers, Earth and Space Sciences, Transport Theory
Plasma Physics and Controlled Fusion
0741-3335 (ISSN) 1361-6587 (eISSN)
Vol. 53 12 124033Subject Categories
Physical Sciences
DOI
10.1088/0741-3335/53/12/124033