Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection. Raman, R., Nelson, B., A., Bell, M., G., Jarboe, T., R., Mueller, D., Bigelow, T., Leblanc, B., Maqueda, R., Menard, J., Ono, M., & Wilson, R. Physical Review Letters, 97(17):1-4, 2006.
Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection [pdf]Paper  abstract   bibtex   
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 approximately 400 ms.

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