This title appears in the Scientific Report : 2003 

Synergy of anomalous transport and radiation in density limit
Tokar, M. Z.
Institut für Plasmaphysik; IPP
Physical review letters, 91 (2003) S. 095001
College Park, Md. APS 2003
095001
10.1103/PhysRevLett.91.095001
Journal Article
Kernfusion und Plasmaforschung
Physical Review Letters 91
J
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Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.91.095001 in citations.
Please use the identifier: http://hdl.handle.net/2128/1792 in citations.
The critical plasma density n(cr) above which the edge anomalous transport in tokamaks is dominated by drift resistive ballooning instability is found analytically. In this transport regime, the drastic increase of particle losses and drop of the edge temperature provoke a strong increase in impurity radiation, and thermal equilibrium does not exist if the density is ramped up above the ultimate limit n(max). Because of the nonlinear character of impurity radiation, this density limit n(max) is very close to n(cr) and practically does not change with the ion effective charge. The importance of the synergy between the anomalous transport and impurity radiation for the density limit phenomenon is confirmed by the results of numerical simulations.