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Anomalous transport produced by electrostatic turbulence using invariance principles/dimensional analysis can produce scaling laws for confinement similar to the empirical results deduced from experimental data, particularly if geometrical effects in toroidal geometry are considered. The ion mass dependence remains a problem for most theories. Experimentally there is good evidence in both ohmic and additionally heated tokamaks that the particle transport in the outer regions of the plasma is driven by electrostatic fluctuations, but the position on energy transport is more complicated due to incomplete data on temperature fluctuations. Owing to the lack of good diagnostic techniques to measure particle and heat fluxes driven by fluctuations in the hot core of the plasma, it is less certain that electrostatic fluctuations produce the anomalous transport in this region. However, the magnetic fluctuations which arise simply from pressure balance are large enough (at high beta) to produce a significant contribution to anomalous heat transport in the core, but not at the edge of the plasma.

Additional information

Authors: ROBINSON D C, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: EUR-CEA-FC-1381 EN (1989) 4 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199010724 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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