Experimental evidence of reduced plasma flow damping with quasisymmetry.
Measurements of plasma flow damping have been made in the helically symmetric experiment using a biased electrode to impulsively spin the plasma. There are two time scales in the evolution of the plasma flow, for both the spin-up and relaxation. Compared to a configuration with the quasisymmetry broken, the flow in the quasisymmetric configuration rises more slowly and to a higher value at bias turn-on, and decays more slowly at bias turn-off. The decays of the flows are significantly faster than the neoclassical prediction.
Gerhardt
S P
SP
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Talmadge
J N
JN
Canik
J M
JM
Anderson
D T
DT