Non-inductive current generation in NSTX using coaxial helicity injection

R. Raman, T. R. Jarboe, D. Mueller, M. J. Schaffer, R. Maqueda, B. A. Nelson, S. A. Sabbagh, M. G. Bell, R. Ewig, E. D. Fredrickson, D. A. Gates, J. C. Hosea, S. C. Jardin, H. Ji, R. Kaita, S. M. Kaye, H. W. Kugel, L. L. Lao, R. Maingi, J. MenardM. Ono, D. Orvis, F. Paoletti, S. F. Paul, Y. K.M. Peng, C. H. Skinner, J. B. Wilgen, S. J. Zweben

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Abstract

Coaxial helicity injection (CHI) on the National Spherical Torus Experiment (NSTX) has produced 240 kA 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 200 ms, limited only by the programmed waveform, are more than an order of magnitude longer in duration than any CHI discharges previously produced in a spheromak or a spherical torus.

Original languageEnglish (US)
Pages (from-to)1081-1086
Number of pages6
JournalNuclear Fusion
Volume41
Issue number8
DOIs
StatePublished - Aug 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Raman, R., Jarboe, T. R., Mueller, D., Schaffer, M. J., Maqueda, R., Nelson, B. A., Sabbagh, S. A., Bell, M. G., Ewig, R., Fredrickson, E. D., Gates, D. A., Hosea, J. C., Jardin, S. C., Ji, H., Kaita, R., Kaye, S. M., Kugel, H. W., Lao, L. L., Maingi, R., ... Zweben, S. J. (2001). Non-inductive current generation in NSTX using coaxial helicity injection. Nuclear Fusion, 41(8), 1081-1086. https://doi.org/10.1088/0029-5515/41/8/311