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

doi:10.1007/s10894-008-9183-9

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

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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.

Original language	English
Pages (from-to)	203-207
Number of pages	5
Journal	Journal of Fusion Energy
Volume	28
Issue number	2 SPEC. ISS.
DOIs	https://doi.org/10.1007/s10894-008-9183-9
State	Published - Jun 2009
Externally published	Yes

Funding

Acknowledgments The authors thank Jon Cole, Alex Robinson, and Amy Wiersma for their assistance with Pegasus operations. We also thank G. Fiksel (U. Wisconsin) for many helpful discussions on plasma gun design. This work is supported by the US Department of Energy, Office of Fusion Energy Sciences, under grant DE-FG02– 96ER54375.

Funders	Funder number
U.S. Department of Energy
Fusion Energy Sciences	DE-FG02– 96ER54375

Keywords

Helicity injection
Magnetic confinement
Tokamak

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s10894-008-9183-9

Cite this

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title = "Point-Source helicity injection current drive system for the Pegasus Toroidal Experiment",

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 = "Helicity injection, Magnetic confinement, Tokamak",

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doi = "10.1007/s10894-008-9183-9",

language = "English",

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AU - Redd, A. J.

AU - Battaglia, D. J.

AU - Bongard, M. W.

AU - Fonck, R. J.

AU - Hinson, E. T.

AU - Kujak-Ford, B. A.

AU - Lewicki, B. T.

AU - Sontag, A. C.

AU - Winz, G. R.

PY - 2009/6

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N2 - 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.

AB - 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.

KW - Helicity injection

KW - Magnetic confinement

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Point-Source helicity injection current drive system for the Pegasus Toroidal Experiment

Abstract

Funding

Keywords

UN SDGs

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