A stationary, detached ionization front is observed in an experimentally simulated divertor plasma (nG3X 1019 mW3, kT,G20 eV) interacting with a hydrogen gas target. with a neutral hydrogen density, n0=2X 10Z1 me3, the electron temperature at the simulated divertor target is reduced to kTe tigrt w 2.5 eV. Up to 97% of the ele&on heat flux (G7 MW/m') is dissipated by dissociation and ionization losses and hydrogen line radiation. The plasma pressure is observed to peak near the ionization front, and a plasma flow reversal is observed in the region of reversed pressure gradient. Classical momentum flow parallel to the magnetic field and anomalous cross-field particle transport are found. The plasma flow is strongly damped by ion-neutral collisions and is subsonic. Numerical results from a one-and-one-half dimensional (1 $D) coupled plasma-neutral fluid model (incorporating radial particle transpo& recycling, and neutral gas injection) agree well with the experimental data, and indicate that the' electron heat flow is classical and well described by a harmonic flux limit. The scale length of the parallel plasma pressure gradient in a gas target is found to depend on the neutral density, the electron coefficient. 0 1995 American Institute of Physics.
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