Journal of Fusion Energy

, Volume 28, Issue 2, pp 203–207 | Cite as

Point-Source Helicity Injection Current Drive System for the Pegasus Toroidal Experiment

  • A. J. Redd
  • D. J. Battaglia
  • M. W. Bongard
  • R. J. Fonck
  • E. T. Hinson
  • B. A. Kujak-Ford
  • B. T. Lewicki
  • A. C. Sontag
  • G. R. Winz
Original Paper

Abstract

Recent Pegasus experiments are developing solenoid-free startup techniques using point-source magnetic helicity injection. These plasma sources, called “plasma guns”, ionize a stream of gas in a discharge channel, and bias this channel with respect to an external electrode, driving current along the plasma stream, which relaxes into a tokamak-like equilibrium. The relaxed discharges formed by these injectors exhibit high current amplification, which is the ratio of total toroidal current to the gun-driven current. The development and present design of these injectors are described, and time traces from a typical discharge are presented.

Keywords

Magnetic confinement Tokamak Helicity injection 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • A. J. Redd
    • 1
  • D. J. Battaglia
    • 1
  • M. W. Bongard
    • 1
  • R. J. Fonck
    • 1
  • E. T. Hinson
    • 1
  • B. A. Kujak-Ford
    • 1
  • B. T. Lewicki
    • 1
  • A. C. Sontag
    • 1
  • G. R. Winz
    • 1
  1. 1.Department of Engineering PhysicsUniversity of WisconsinMadisonUSA

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