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A fluid model for an electrode-less, toroidal breakdown process in the presence of a steady magnetic field is developed. Breakdown processes in the Extrap configuration are studied. Both particle balance and energy balance are solved to obtain breakdown voltages. A 2-dimensional particle balance is solved for the Extrap configuration and the existence of the magnetic nulls seems to play an important role. The concept of the Townsend first coefficient alpha is found not to be applicable when the particle losses are severe, and the energy balance has to be solved to explain the very high low-threshold of the filling pressure observed in the Extrap breakdown experiments. The theoretical results are compared with experiments; a fairly good agreement is achieved.

Additional information

Authors: JIN LI, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: Report: TRITA-PFU-88-07 EN (1988)
Availability: Available from the Department of Plasma Physics and Fusion Research, Royal Institute of Technology, S-10044 Stockholm (SE)
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