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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 allowances are made for geometrical effects in toroidal geometry. 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. The position on energy transport is more complicated, due to incomplete data on temperature fluctuations. As a result of 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: CLM-P869 EN (1989) 20 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199010826 / Last updated on: 1994-12-01
Original language: en
Available languages: en