Advances in transport understanding using perturbative techniques in TFTR

M. C. Zarnstorff, C. W. Barnes, P. C. Efthimion, G. W. Hammett, W. Horton, R. A. Hulse, D. K. Mansfield, E. S. Marmar, K. M. McGuire, G. Rewoldt, B. C. Stratton, E. J. Synakowski, W. M. Tang, J. L. Terry, X. Q. Xu, M. G. Bell

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

46 Scopus citations

Abstract

The parametric dependence of transport in TFTR plasmas is investigated using perturbative techniques. By perturbing the current in L-mode plasmas; the thermal transport outside r approximately a/2 is found to be insensitive to the plasma current or its shape. As a consequence, it is found that the global confinement can be strongly enhanced or reduced relative to L-mode scaling at fixed Ip by modifying the current profile. The density profile has been perturbed in supershot plasmas to force the plasma far above the stability threshold for ITG-modes. The ion transport in supershots is found to not be governed by marginal stability to the ITG-mode. Density pulse propagation studies of L-mode plasmas indicate that the electron particle transport varies as Te1.5-2.5 and that the diffusivity of trace amounts of helium is similar to the thermal diffusivities. Both measurements are consistent with electrostatic transport models.

Original languageEnglish
Title of host publicationProc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
Pages109-122
Number of pages14
StatePublished - 1991

Publication series

NameProc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

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