Control of Neoclassical Tearing Modes for Improved Performance in Iter
نویسندگان
چکیده
منابع مشابه
Introduction to Neoclassical Tearing Modes and the Role of Rotation
It is now well established from theoretical considerations and from several experimental observations of long pulse high β tokomak discharges that the limit on plasma pressure is not set by the ideal MHD modes but is rather due to the onset of low (m, n) resistive modes. These instabilities, which produce magnetic islands at the low order rational surfaces, appear to be well described by the ne...
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The system planned for electron cyclotron current drive (ECCD) in ITER can mitigate the deleterious effects of neoclassical tearing modes (NTMs) provided that adequate alignment of the ECCD to the rational surface is maintained or too large a misalignment is corrected on a time scale shorter than the plasma response to “large” islands. Resistive neoclassical tearing modes (NTMs) will be the pri...
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A revised version of the ISLAND module ͓C. tokamak discharges in order to investigate the adverse effects of multiple saturated magnetic islands driven by neoclassical tearing modes ͑NTMs͒. Simulations are carried out with a predictive model for the temperature and density pedestal at the edge of the high confinement mode ͑H-mode͒ plasma and with core transport described using the Multi-Mode model. ...
متن کاملSawtooth pacing by real-time auxiliary power control in a tokamak plasma.
In the standard scenario of tokamak plasma operation, sawtooth crashes are the main perturbations that can trigger performance-degrading, and potentially disruption-generating, neoclassical tearing modes. This Letter demonstrates sawtooth pacing by real-time control of the auxiliary power. It is shown that the sawtooth crash takes place in a reproducible manner shortly after the removal of that...
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A model which incorporates the effects of electron cyclotron current drive (ECCD) into the magnetohydrodynamic (MHD) equations is implemented in the NIMROD code [C. R. Sovinec et al., J. Comp. Phys. 195, 355 (2004)] and used to investigate the effect of ECCD injection on the stability, growth, and dynamical behavior of magnetic islands associated with resistive tearing modes. Predictions of the...
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تاریخ انتشار 2007