H. Shirai et al., ION TEMPERATURE PROFILE SIMULATION OF JT-60 AND TFTR PLASMAS WITH IONTEMPERATURE-GRADIENT MODE TRANSPORT MODELS, Nuclear fusion, 34(5), 1994, pp. 703-727
Ion temperature profiles of neutral beam heated plasmas in JT-60 and T
FTR have been simulated using models of ion thermal diffusivity, chi(i
), based on ion temperature gradient mode (eta(i) mode) turbulence and
drift wave turbulence (trapped electron mode and circulating electron
mode). The ion temperature profiles measured by charge exchange recom
bination spectroscopy are compared to predicted T(i) profiles calculat
ed from three theoretical models for ion heat transport by Dominguez a
nd Waltz, Lee and Diamond, and Romanelli. All three chi(i) models can
reproduce the measured T(i) profile over a wide range of parameters in
JT-60 L mode plasmas, except for two 1 MA limiter cases. With the use
of transport models, which were adjusted to fit JT-60 plasmas, it was
found that the Dominguez and Waltz and Romanelli models agree with me
asured T(i) profiles in TFTR L mode discharges in the region a/4 < r <
a/2. The observed central peaking of T(i) near the magnetic axis of T
FTR L mode plasmas cannot be reproduced. It was found that the Lee and
Diamond model does not fit the data as well. The chi(i) models studie
d cannot consistently reproduce the measured T(i) in the peripheral re
gion of either JT-60 or TFTR plasmas. In the high ion temperature (hig
h T(i)) plasmas of JT-60 and supershot plasmas of TFTR, the predicted
T(i) profiles are much broader than the measured profile. In supershot
plasmas, the measured central ion temperature greatly exceeds the pre
dicted temperature, although there is reasonable agreement near the ed
ge.