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The ablation cloud of a pellet injected into a plasma consists of two fairly distinct regions: a cold, dense, weakly ionised core region, whose expansion is spherically symmetric and a warm plasma outer region, which forms an elongated channel parallel to B. The core region is transonic. The pellet mass ablation rate depends only on the attenuated incident electron energy flux falling on the sonic surface. The attenuation is dictated by the total integral ndl in the outer region. The quasi-steady fast core region provides a particle source for the more slowly evolving outer region, described using a time-dependent model under development at IPP-Garching. By joining the two regions, a self-consistent ablation model can be constructed for refuelling studies on fusion grade plasmas.

Additional information

Authors: PARKS P B, General Atomics, San Diego (US)
Bibliographic Reference: Report: IPP 5/40 EN (1991) 14 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199111298 / Last updated on: 1994-12-02
Original language: en
Available languages: en