Transport of energetic ion and electron energy through the vapor shield during a tokamak plasma disruption

Energetic (>10 keV) particles incident on divertor plate surfaces may penetrate the vapor shield (VS) formed under extremely high heat flux conditions (>10/sup 10/ W/m/sup 2/). In this case the total energy transmission factor f, through the VS can increase drastically which leads to more surface damage. 'MAGFIRE' a 1D time dependent coupled MHD-radiation transport code, originally used in modeling the vapor shield development under a blackbody radiation source, has been modified to include a charged particle source. The sources used to model a disruption are mono-energetic beams of electrons and/or deuterons with any given incident heat flux and energy/particle. An electron source will eventually (<100 /spl mu/s) be completely absorbed by the vapor and will give the same f as an equivalent ion heat flux source. Results show that in fact all three sources converge (/spl sim/100 /spl mu/s) to the same steady-state value of f for any given heat flux.