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(EX8/5) Non-Inductive Current Generation in NSTX Using Coaxial Helicity Injection

R. Raman1), T. R. Jarboe1), D. Mueller2), M. Schaffer3), R. Maqueda4), B. A. Nelson1), S. A. Sabbagh5), M. Bell2), R. Ewig1), E. Fredrickson2), D. Gates2), J. C. Hosea2), S. C. Jardin2), H. Ji2), R. Kaita2), S. Kaye2), H. Kugel2), L. L. Lao3), R. Maingi6), J. Menard2), M. Ono2), D. Orwis1), S. Paul2), M. Peng6), C. Skinner2), J. Wilgen6), S. Zweben2), and the NSTX Research Team2)
1) University of Washington, Seattle, WA, USA
2) Princeton Plasma Physics Laboratory, Princeton, NJ, USA
3) General Atomics, San Diego, CA, USA
4) Los Alamos National Laboratory, Los Alamos, NM, USA
5) Columbia University, New York, NY, USA
6) Oak Ridge National Laboratory, Oak Ridge, TN, USA

Abstract.  Coaxial Helicity Injection (CHI) on the National Spherical Torus Experiment (NSTX) has produced 240kA of toroidal current without the use of the central solenoid. Values of the current multiplication ratio (CHI produced toroidal current / injector current) up to 10 were obtained, in agreement with predictions. The discharges which lasted for up to 200ms, limited only by the programmed waveform are more than an order of magnitude longer in duration that any CHI discharges previously produced in a Spheromak or a Spherical Torus (ST).

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IAEA 2001