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Linear tearing mode stability for low-q cylindrical tokamaks

  • Moshe Rosenblum (a1)

Abstract

Detailed computational results are presented for the stability of linear tearing modes in low-q cylindrical tokamaks with various radial profiles. The stability properties of a widely used ‘classical’ profile are compared with those of a ‘piecewise’ profile. It is shown that the stability properties of low-q tokamak discharges show a sensitive dependence on small changes in the current density profile near the singular surface. While the ‘classical’ profile is stable for a large range of q0, where q0 is the value of the safety factor on the magnetic axis, a similar ‘piecewise’ profile is unstable for the same set of parameters.

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Chance, M. S., Furth, H. P., Glasser, A. H. & Selberg, H. 1982 Nucl. Fusion, 22, 187.
Furth, H. P., Killeen, J. & Rosenbluth, M. N. 1963 Phys. Fluids, 6, 459.
Furth, H. P., Rutherford, P. H. & Selberg, H. 1973 Phys. Fluids, 16, 1054.
Heidbrink, W. W., Jardin, S. C. & Chance, M. S. 1982 Nucl. Fusion, 22, 459.
Wesson, J. A. 1978 Nucl. Fusion, 18, 87.
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Linear tearing mode stability for low-q cylindrical tokamaks

  • Moshe Rosenblum (a1)

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