Some features of the disruption instability in reversed shear TFTR plasmas
I.B. Semenov; S.V. Mirnov; K.M. McGuire; M.G. Bell; E.D. Fredrickson; M. Okabayashi; P.V. Savrukhin; G. Taylor; V.A. Vershkov; L.E. Zakharov; I.B. Semenov; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; S.V. Mirnov; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; K.M. McGuire; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; M.G. Bell; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; E.D. Fredrickson; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; M. Okabayashi; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; P.V. Savrukhin; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; G. Taylor; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; V.A. Vershkov; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America; L.E. Zakharov; Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, United States of America
Журнал:
Nuclear Fusion
Дата:
1999-11-01
Аннотация:
The behaviour of MHD perturbations before and during disruptions in TFTR reversed shear plasmas with q<sub>min</sub> ≈ 2 was analysed. In the q<sub>min</sub> region, tearing modes, wavelike modes, and mixed tearing plus wavelike modes are followed by disruption. Sometimes a helical snake (helix) appears at the X point of the q<sub>min</sub> island. The local outward electron energy transport near the X point can be explained by the development of `positive' magnetic islands (islands with positive current perturbations). It is proposed that the disruption is initiated when the X point of the magnetic islands coincides in one toroidal position near the torus equator.
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