TITLE
	Control of long range turbulent transport with biasing in the tokamak SOL

AUTHOR
	Charles FIGARELLA

ABSTRACT 
	Cross field transport in the SOL influences tokamak performance in 
	particular regarding the divertor efficiency. Recent experiment evidence 
	emphasizes non-exponential and/or flat SOL profiles that suggest a large 
	perpendicular transport. A 2D fluid model based on the interchange 
	instability to simulate the SOL turbulence was found to exhibits 
	intermittent dynamics of the particle flux. We propose a control method that 
	prevents long range transport events from reaching the far SOL : It consists 
	in biasing the far SOL leading to a transport barrier which stops the 
	propagation of these intermittent events. The best trade off is to localize 
	the biased toroidal ring around the baffles. We show that such a control is 
	achievable providing the strength of the barrier is strong enough. The 
	investigation of the minimal biasing power required to achieve the control 
	as well as its experimental estimate is performed.