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Previous analyses of the dynamical behaviour of the tearing mode in a highly conducting fluid have considered the factors which determine stability and the source of the driving energy. Here the problem is reconsidered, and the energy balance described in a way which clarifies the underlying physics. It is seen that the energy flow arising from Furth's energy integral V is dissipated solely in the kinetic energy association with the odd part of the two variables which arise in the stability calculation. The remaining part of the so-called first energy balance equation involves only layer quantities and shows how the internal driving term D(in) is complementary to D(out). The other energy balance is between the residual source term and the y-independent ohmic heating term. It is also noted that the lowering of the magnetic energy in a region does not necessarily mean that the region provides the energy source for the instability.

Additional information

Authors: WESSON J A, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(9)39 EN (1991) 20 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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