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A review is given of the theoretical analysis on the Extrap concept, which consists of a Z-pinch being immersed in an octupole field generated by currents in a set of external conductors. This includes research on plasma breakdown and start-up, equilibrium and stability, in terms of MHD and kinetic theory. Extrap theory includes an area of diversified problems, being related to a high beta value, a non-circular plasma cross section with a magnetic separatrix, and strongly inhomogeneous plasma conditions in space. This also leads to unexplored and important areas of plasma physics, reaching beyond the special applications to the Extrap configuration. At present, progress has been made in the analysis of breakdown, of dissipation-free equilibria, and in identifying the instability modes and possible stabilising mechanisms in Extrap. Nevertheless much work still remains to be done within the areas of dissipative equilibria and transport, in order to reach a complete theoretical understanding of the experimentally observed stability.

Additional information

Authors: LEHNERT B, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: Report: TRITA-PFU-88-11 EN (1988)
Availability: Available from the Department of Plasma Physics and Fusion Research, Royal Institute of Technology, S-100 44 Stockholm (SE)
Record Number: 198910745 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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