Toroidal rotation braking with n = 1 magnetic perturbation field on JET

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    A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.
    Original languageEnglish
    Article number105007
    Number of pages19
    JournalPlasma Physics and Controlled Fusion
    Issue number10
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed


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