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The ion thermal conductivity X(i), arising from strong ion temperature gradient driven turbulence, is derived, taking into account effects from ion resonance damping (linear and nonlinear) and broader radial eigenmodes. It is assumed that when a mode resonates with ions (as determined from a local solution of the gyrokinetic equation), it will saturate at a level too low to contribute significantly to transport. The remaining modes are fluid and strongly turbulent, and a mixing length estimate is used to find X(i). The results are a prediction of the threshold of strong transport (which is different from the linear stability threshold), and an ion thermal conductivity, which contains more physical effects basic to the Eta(i) mode than previous estimates of X(i). A more accurate but more elaborate form of X(i) is presented in the text.

Additional information

Authors: MATTOR N, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: CLM-P872 EN (1990) 12 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199010825 / Last updated on: 1994-12-01
Original language: en
Available languages: en