Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection

R. Raman, B. A. Nelson, M. G. Bell, T. R. Jarboe, D. Mueller, T. Bigelow, B. Leblanc, R. Maqueda, J. Menard, M. Ono, R. Wilson

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Abstract

A method of coaxial helicity injection has successfully produced a closed flux current without the use of the central solenoid in the NSTX device, on a size scale closer to a spherical torus reactor, for a proof-of-principle demonstration of this concept. For the first time, a remarkable 60 times current multiplication factor was achieved. Grad-Shafranov plasma equilibrium reconstructions are used to verify the existence of closed flux current. In some discharges the generated current persists for a surprisingly long time ∼400ms.

Original languageEnglish
Article number175002
JournalPhysical Review Letters
Volume97
Issue number17
DOIs
StatePublished - 2006

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