R. Raman et al 2007 Nucl. Fusion 47 792 doi:10.1088/0029-5515/47/8/009
R. Raman1, D. Mueller2, T.R. Jarboe1, B.A. Nelson1, M.G. Bell2, M. Ono2, T. Bigelow3, R. Kaita2, B. LeBlanc2, K.C. Lee4, R. Maqueda5, J. Menard2, S. Paul2 and L. Roquemore2
Show affiliationsCoaxial helicity injection (CHI) has been successfully used in the National Spherical Torus Experiment for a demonstration of closed flux current generation without the use of the central solenoid. The favourable properties of the spherical torus (ST) arise from its very small aspect ratio. However, small aspect ratio devices have very restricted space for a substantial central solenoid. Thus methods for initiating the plasma current without relying on induction from a central solenoid are essential for the viability of the ST concept. CHI is a promising candidate for solenoid-free plasma startup in a ST. The method has now produced closed flux current up to 160 kA verifying the high current capability of this method in a large ST built with conventional tokamak components.
52.55.Hc Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
52.55.Wq Current drive; helicity injection
52.55.Rk Power exhaust; divertors
Issue 8 (August 2007)
Received 31 January 2007, accepted for publication 21 May 2007
Published 23 July 2007
R. Raman et al 2007 Nucl. Fusion 47 792
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