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MHD plasma physics in rail accelerators for hydrogen-pellet injection in fusion reactors

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4 Author(s)
Azzerboni, B. ; Istituto di Elettrotecnica ed Elettronica, Catania, Italy ; Becherini, G. ; Cardelli, E. ; Tellini, A.

The behavior of the electromagnetic and thermal quantities in a plasma arc placed between two conducting rails is analyzed. The plasma hydrogen drives the hydrogen pellets for the refueling of magnetic fusion reactors. Considering the general equations of electromagnetism and of plasma fluid dynamics and assuming steady-state conditions in a frame which is moving at the same rate as the plasma arc armature, a one-dimensional model is deduced. The effects of an applied magnetic field on the behavior of all flow variables are investigated. Results indicate that the adverse effects of plasma arc heating can be reduced by the application of a magnetic-induction field normal to the current path in the armature. At the maximum acceleration pressure (30 bar) applicable to the hydrogen pellet in the proposed one-dimensional model, the arc temperature at the pellet backend falls from 20000 to 14000 K when a magnetic induction of about 5 T is applied

Published in:

Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 3 )

Date of Publication:

Jun 1989

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