Overview of the Helicity Injected Torus (HIT) program

A. J. Redd, T. R. Jarboe, W. T. Hamp, B. A. Nelson, R. G. O'Neill, P. E. Sieck, R. J. Smith, G. L. Sutphin, J. S. Wrobel

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The Helicity Injected Torus with Steady Inductive Helicity Injection (HIT-SI) consists of a "bowtie"-shaped axisymmetric confinement region, with two half-torus helicity injectors mounted on each side of the axisymmetric flux conserver [Sieck et al, IEEE Trans. Plasma Sci., v.33, p.723 (2005); Jarboe, Fusion Technology, v.36, p.85 (1999)]. Current and flux are driven sinusoidally with time in each injector, with the goal of generating and sustaining an axisymmetric spheromak in the main confinement region. Improvements in machine conditioning have enabled systematic study of HIT-SI discharges with significant toroidal current I TOR, including cases in which this current I TOR switches sign one or more times during the discharge. Statistical studies of all HIT-SI discharges to date demonstrate a minimum injected power to form significant I TOR, and that the maximum I TOR scales approximately linearly with the total injected power.

Original languageEnglish (US)
Pages (from-to)163-168
Number of pages6
JournalJournal of Fusion Energy
Issue number1-2
StatePublished - Jun 2007
Externally publishedYes


  • Helicity injection current drive
  • Magnetic confinement
  • Spheromak

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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