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Abstract

Field reversed configurations (FRC) and theta pinches with trapped reversed bias field are essentially the same magnetic confinement systems using closed magnetic field lines inside an open-ended magnetic flux tube. A simple model of joule heating and parallel electron thermal conduction along the open flux lines to an external heat sink gives the electron temperature as T-e(eV) about 0.05 B**2/3(G) L**13(cm), where B is the magnetic field and L is the coil length. This model appears to agree with measurements from present FRC experiments and past theta pinch experiments which cover a range of 40-900 eV. The energy balance in the model is dominated by (a) parallel electron thermal conduction along the open field lines which has a steep temperature dependence, O varies as T-e**7/2, and (b) the assumed rapid perpendicular transport in the plasma bulk which, in experiments to date, may be due to the small number of ion gyroradii across the plasma.

Additional information

Authors: NEWTON A A CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: NUCLEAR FUSION, VOL. 26 (1986), NO. 6, PP. 779-783
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