Physics of transport in tokamaks

This paper is an overview of recent results relating to turbulent particle and heat transport, and to the triggering of internal transport barriers (ITBs). The dependence of the turbulent particle pinch velocity on plasma parameters has been clarified and compared with experiment. Magnetic shear and collisionality are found to play a central role. Analysis of heat transport has made progress along two directions: dimensionless scaling laws, which are found to agree with the prediction for electrostatic turbulence, and analysis of modulation experiments, which provide a stringent test of transport models. Finally the formation of ITBs has been addressed by analysing electron transport barriers. It is confirmed that negative magnetic shear, combined with the Shafranov shift, is a robust stabilizing mechanism. However, some well established features of internal barriers are not explained by theory.


Published in:
Plasma Physics and Controlled Fusion, 46, B557-B574
Year:
2004
ISSN:
0741-3335
ISBN:
0741-3335
Note:
Sp. Iss. SI Suppl. 12B
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-09-13


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