On the possibility to separate isotopes by means of a rotating plasma column : isotope separation with a hollow cathode discharge

Separation of isotopes by means of a rotating plasma column was investigated. In spite of high rotational velocities, direct separation in the plasma did not seem promising because of the high temperature of the plasma. Therefore, emphasis was placed on the possibility of driving a neutral gas with the plasma in a set up which has some similarities with an ultra centrifuge. It is difficult to evaluate the role of neutral particles in the discharge. Even in relatively small concentrations, neutral particles may be of great importance in a highly ionized plasma. An unforeseen axial temperature gradient in the plasma of the hollow cathode discharge (caused by charge exchange collisions) leads to domination of the axial separative effects over radial effects and to breakdown of the proposed scheme. In pure argon gas static separation factors of maximal 1.3 were found. Even if substantial technical difficulties are left out of consideration it seems that isotope separation by means of a rotating plasma is not of practical interest.