Effects of toroidal field direction and heating power on divertor asymmetry and scrape-off layer flow in EAST

Divertor asymmetry and scrape-off layer (SOL) flow have been systematically investigated in the EAST, with respect to toroidal field direction, divertor configuration, power injection methods and heating power. Divertor plasma exhibits an outboard-enhanced in-out asymmetry in heat flux in LSN configuration for both normal and reversed field directions. USN exhibits an inboard-favored asymmetry for normal field, while exhibits a balanced or even outboard-favored asymmetry for reversed field. DN has the strongest in-out asymmetry in heat flux, favoring the outer divertor. The in-out asymmetry ratio of q$_{t,out}$/q$_{t,total}$ increases with the power across the separatrix P$_{loss}$. The characteristics of the measured SOL parallel flow under various discharge conditions are consistent with the Pfirsch-Schl\"uter flow with the parallel Mach number M$_{\vert \vert }$ decreasing with the line averaged density but increasing with P$_{loss}$.