Pj. Harbour et A. Loarte, DEPARTURES FROM SONIC FLOW AT THE SHEATH ON A DIVERTOR TARGET OR LIMITER, Contributions to Plasma Physics, 34(2-3), 1994, pp. 312-317
Sonic transitions in a scrape-off layer (SOL) are discussed, showing t
he importance of particle and momentum sources, temperature gradients,
area change and viscous effects. Supersonic boundary conditions are c
onsidered. Sonic transitions are modelled over a wide range of paramet
ers using EDGE1D.