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

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


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
Issue number8
StatePublished - Aug 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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