PPPL-3411 is available in <a href="PPPL-3411.pdf">pdf</a> or 
<a href="PPPL-3411.ps">postscript</a> formats.

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<b>Nonlinear Evolution of Double Tearing Modes in Tokamaks</b>
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<p><b>Title:</b> E. Fredrickson, M. Bell, R.V. Budny, and E. Synakowski</p>

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<b>Date of PPPL Report:</b> December 1999
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<b>Published in:</b> Phys. Plasmas <b>7</b> (October 2000) 4112-4120.</p>

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The delta prime formalism with neoclassical modifications has proven to be a useful tool in the study of tearing modes in high beta, collisionless plasmas. In this paper the formalism developed for the inclusion of neoclassical effects on tearing modes in monotonic q-profile plasmas is extended to plasmas with hollow current profiles and double rational surfaces. First, the classical formalism of tearing modes in the Rutherford regime in low beta plasmas is extended to q profiles with two rational surfaces. Then it is shown that this formalism is readily extended to include neoclassical effects.


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