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The Extrap scheme consists of a Z-pinch immersed in an octupole field generated by currents in a set of external conductors. A comparison between linear and toroidal Extrap geometry is made. As compared to toroidal systems, linear geometry has the advantages of relative simplicity and of a current drive by means of electrodes. Linear devices are convenient for basic studies of Extrap, at moderately high pinch currents and plasma temperatures. Within the parameter ranges of experiments at high pinch currents and plasma temperatures, linear systems have on the other hand some substantial disdadvantages, on account of the plasma interaction with the end regions. This results in a limitation of the energy confinement time, and leads in the case of an ohmically heated plasma to excessively high plasma densities and small pinch radii which also complicate the introduction of the external conductors.

Additional information

Authors: LEHNERT B, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: Report: TRITA-PFU-88-08 EN (1988)
Availability: Available from the Department of Plasma Physics and Fusion Research, Royal Institute of Technology, S-10044 Stockholm (SE)
Record Number: 198910472 / Last updated on: 1994-12-01
Original language: en
Available languages: en