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000028008 084__ $$2WoS$$aPhysics, Fluids & Plasmas
000028008 084__ $$2WoS$$aPhysics, Nuclear
000028008 1001_ $$0P:(DE-Juel1)5089$$aTokar, M. Z.$$b0$$uFZJ
000028008 245__ $$aMechanism of central temperature peaking in impurity seeded plasmas
000028008 260__ $$aBristol$$bIOP Publ.$$c2003
000028008 300__ $$a1323 - 1332
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000028008 440_0 $$04996$$aPlasma Physics and Controlled Fusion$$v45$$x0741-3335
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000028008 520__ $$aFormation of a centrally peaked profile of the ion temperature by impurity seeding has been observed in all the largest tokamaks: JET, JT-60U, TFTR. A possible explanation of this phenomenon is proposed, which takes into account the suppression of ion temperature gradient instability induced anomalous transport through increasing ion effective charge Z(eff) and Doppler shift of unstable modes, S-perpendicular to. The particular importance of the S-perpendicular to component proportional to the temperature gradient, which stems from the pressure gradient and neoclassical poloidal rotation, is elucidated. It is demonstrated that this contribution grows significantly by impurity seeding when the rotation regime changes due to increased collisionality. An interrelation between the heating power density and Z(eff) necessary for the transition to a peaked ion temperature is found. The modification of radial profiles by impurity seeding is modelled numerically and the results are in agreement with the experimental data from JET.
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000028008 8567_ $$uhttp://hdl.handle.net/2128/1780$$uhttp://dx.doi.org/10.1088/0741-3335/45/7/319
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