|Title||Enhanced -->E*-->B drift effects in the TCV snowflake divertor|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||G.P. Canal, T. Lunt, H. Reimerdes, B.P Duval, B. Labit, W.AJ Vijvers, TCV team|
Measurements of various plasma parameters at the divertor targets of snowflake (SF) and conventional single-null configurations indicate an enhanced effect of the -->E*-->B drift in the scrape-off layer of plasmas in the SF configuration. Plasma boundary transport simulations using the EMC3-Eirene code show that the poloidal gradients of the kinetic profiles in the vicinity of the null-point of a SF divertor are substantially larger than those of a conventional single-null configuration. These gradients are expected to drive larger -->E*-->B flows in the SF divertor and are thought to be responsible for the formation of the double-peaked particle and heat flux target profiles observed experimentally. Experiments in forward and reversed toroidal magnetic field directions further support this conclusion. The formation of such a double-peaked profiles is enhanced at higher plasma densities and may have beneficial effects on the divertor heat loads since they lead to broader target profiles and lower peak heat fluxes.
|Alternate Title||Nucl. Fusion|
Go back one page.