PPPL-4212 (Technical Report)
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<b>Efficient Generation of Closed Magnetic Flux Surfaces in a Large Spherical Tokamak Using Coaxial Helicity Injection</b>
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<b>Authors:</b> R. Raman, B.A. Nelson, M.G. Bell, T.R. Jarboe, D. Mueller, T. Bigelow, B. LeBlanc, R. Maqueda, J. Menard, M. Ono, and R. Wilson

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<b>Abstract</b>:
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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 ~400 ms.
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<b>Full text:</b>
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<a href="PPPL-4212.pdf" Target="_blank">PPPL-4212 Technical Report</a> (January 2007 /pdf 552 Kb) 
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<b>Journal</b>:
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<a href="http://scitation.aip.org/dbt/dbt.jsp?KEY=PRLTAO&Volume=97&Issue=17" Target="_blank">Physical Review Letters <b>97</b></a>, 175002 (2006)  &#169; 2006 <i>American Physical Society</i><br>
<a href="http://dx.doi.org/" Target=_blank>doi:</a> 10.1103/PhysRevLett.97.175002


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