Abstract
AbstractThe problem of density limit and thermal disruption is one of the most important in ITER project. Different reasons for the disruption discuss now. At least 3% of disruptions are produced by the high level of impurity radiation from the edge [P.C. De Vries et al., Nucl. Fusion 51, 053018 (2011)]. Two reasons of the thermal disruption have been discussed earlier using simplified radiation model, the equilibrium loss [J.F. Drake, Phys. Fluids 30, 2429 (1987)], and radiation instability of the mode m = 0, n = 0 [M.Z. Tokar, Phys. Plasmas 7, 2432 (2000)]. Using the simplified model M.Z. Tokar founds two solutions. One of them is stable, the other is unstable. It is shown in the present paper that the unstable solution appears if the plasma density exceeds the critical value. The latter is found as a function of discharge parameters. It is shown also that the stable regime exists for realistic discharge parameters independently of plasma density. These regimes didn't investigated by M.Z. Tokar. Also, more adequate radiation models are discussed including charge‐exchange. It is shown that the impurity ‐ main plasma charge‐exchange decreases the critical density. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Published Version
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