Experimental Demonstration of Tokamak Inductive Flux Saving by Transient Coaxial Helicity Injection on NSTX
Authors: R. Raman, D. Mueller, T.R. Jarboe, B.A. Nelson, M.G. Bell, S. Gerhardt, B. LeBlanc, J. Menard, M. Ono, L. Roquemore, V. Soukhanovskii
Abstract:
Discharges initiated by Transient Coaxial Helicity Injection (CHI) in NSTX have attained peak toroidal
plasma currents up to 300 kA. When induction from the central solenoid is then applied, these discharges
develop up to 300 kA additional current compared to discharges initiated by induction only. CHI initiated
discharges in NSTX have achieved 1 MA of plasma current using only 258 mWb of solenoid flux whereas
standard induction-only discharges require about 50% more solenoid flux to reach 1 MA. In addition, the
CHI-initiated discharge has lower plasma density and a low normalized internal plasma inductance of
0.35, as needed for achieving advanced scenarios in NSTX.
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Submitted to: Physics of Plasmas (2011)
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