TY - JOUR
T1 - Analysis and modelling of power modulation experiments in JET plasmas with internal transport barriers
AU - Marinoni, A.
AU - Mantica, P.
AU - Van Eester, D.
AU - Imbeaux, F.
AU - Mantsinen, M.
AU - Hawkes, N.
AU - Joffrin, E.
AU - Kiptily, V.
AU - Pinches, S. D.
AU - Salmi, A.
AU - Sharapov, S.
AU - Voitsekhovitch, I.
AU - De Vries, P.
AU - Zastrow, K. D.
PY - 2006/10/1
Y1 - 2006/10/1
N2 - Understanding the physics of internal transport barriers (ITBs) is a crucial issue in developing ITER relevant advanced tokamak scenarios. To gain new information on ITBs, RF power modulation experiments, mainly devoted to the study of electron heat transport through ITBs, have been performed on the JET tokamak. The main physics results have been reported in [1]. The present paper describes in detail the data analysis and numerical modelling work carried out for the interpretation of the experiments. ITBs located in the negative shear region behave as localized insulating layers able to stop the heat wave propagation, thus implying that the ITB is a region of low diffusivity characterized by a loss of stiffness. Various sources of spurious effects affecting the interpretation of the results are analysed and discussed. First principle based models have so far failed to predict the temperature profile in the first place, which prevented their application to modulation results, while empirical transport models have been set up and reproduce the major part of the data.
AB - Understanding the physics of internal transport barriers (ITBs) is a crucial issue in developing ITER relevant advanced tokamak scenarios. To gain new information on ITBs, RF power modulation experiments, mainly devoted to the study of electron heat transport through ITBs, have been performed on the JET tokamak. The main physics results have been reported in [1]. The present paper describes in detail the data analysis and numerical modelling work carried out for the interpretation of the experiments. ITBs located in the negative shear region behave as localized insulating layers able to stop the heat wave propagation, thus implying that the ITB is a region of low diffusivity characterized by a loss of stiffness. Various sources of spurious effects affecting the interpretation of the results are analysed and discussed. First principle based models have so far failed to predict the temperature profile in the first place, which prevented their application to modulation results, while empirical transport models have been set up and reproduce the major part of the data.
UR - http://www.scopus.com/inward/record.url?scp=33749040931&partnerID=8YFLogxK
U2 - 10.1088/0741-3335/48/10/002
DO - 10.1088/0741-3335/48/10/002
M3 - Article
AN - SCOPUS:33749040931
SN - 0741-3335
VL - 48
SP - 1469
EP - 1487
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 10
M1 - 002
ER -