A time-dependent slab symmetric ablation model with allowance for transverse expansion and magnetic confinement effects
A self-consistent, time-dependent, slab-symmetric ablation model has been developed. Two time-dependent 1.5-D variable mass Lagrangian codes are coupled which are based on the full set of conservation equations with mass-source terms present, and on Maxwell's equations. The energy deposition in the shielding cloud is determined by stopping length calculations applied along the magnetic field lines with allowance for electrostatic shielding effects. Stopping length calculations are supplemented by thermal diffusion calculations, thus redistributing the energy deposited in the discrete energy group approximation. The neutral cloud expands in the direction perpendicular to the magnetic field. The deceleration and full stopping of this motion are calculated by means of an MHD model, thus determining the transient variation of the lateral cloud dimension. The time variation of the ablation rate, as well as its value averaged over the residence time of a pellet in a flux tube defined by the ionisation radius of the ablatant is presented and compared with results stemming from known steady-state ablation models.
Bibliographic Reference: Report: IPP 5/50 EN (1992) 15 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199310655 / Last updated on: 1994-11-29
Original language: en
Available languages: en