Flux and particle life-time measurements in field-reversed configurations

Slough, John; Hoffman, A. L.; Milroy, R. D.; Harding, Dennis G.; Steinhauer, L. C.

doi:10.1088/0029-5515/24/12/002

Cited by 58 publications

(37 citation statements)

References 15 publications

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“…(d) Significant advances in FRC formation have been made: programmed formation has led to improved FRC behaviour [27,28], and slow formation studies [10] have been initiated that could eventually result in a more attractive technology.…”

Section: Technical Achievementsmentioning

confidence: 99%

Field reversed configurations

1988

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The review is devoted to field reversed configurations and to the related field reversed mirrors; both are compact toroids with little or no toroidal magnetic field. Experimental and theoretical results on the formation, equilibrium, stability and confinement properties of these plasmas are presented. Although they have been known for about three decades, field reversed configurations have been studied intensively only in recent years. This renewed interest is due to the unusual fusion reactor potential of these high beta plasmas and also to their surprising macroscopic stability. At the present time, field reversed configurations appear to be completely free of gross instabilities and show relatively good confinement. The primary research goal for the near future is to retain these favourable properties in a less kinetic regime. Other important issues include the development of techniques for slow formation and stability, and a clearer assessment of the confinement scaling laws.

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Section: Technical Achievementsmentioning

confidence: 99%

Field reversed configurations

1988

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“…However, there is a concern that impurities in the plasma will degrade performance during the FRC equilibrium phase. Plasma impurities are a common occurrence in FRC plasmas 8 and sometimes require extensive mitigation. 9 For this work, we focused our efforts on quantifying the radiative loss from a high-density FRC and not on impurity mitigation.…”

Section: Introductionmentioning

confidence: 99%

Power balance in a high-density field reversed configuration plasma

et al. 2008

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A global power balance analysis has been performed for the Field Reversed Experiment with Liner high density (>5×1022m−3) field reversed configuration (FRC) plasma. The analysis was based on a zero-dimensional power balance model [D. J. Rey and M. Tuszewski, Phys. Fluids 27, 1514 (1984)]. The key findings are as follows. First, the percentage of radiative losses relative to total loss is an order of magnitude lower than previous lower density FRC experiments. Second, Ohmic heating was found to correlate with the poloidal flux trapping at FRC formation, suggesting that poloidal flux dissipation is primarily responsible for plasma heating. Third, high density FRCs analyzed in this work reinforce the low-density adiabatic scaling, which shows that particle confinement time and flux confinement time are approximately equal.

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“…Although the triggering system is capable of firing the guns independently, all guns were triggered simultaneously for this study. Both MSX and FRCHX use "programmed" formation 41,42 to force reconnection to occur at externally applied magnetic cusps. This promotes symmetry and prevents tearing instabilities for more reproducible and well-formed FRCs.…”

Section: A Plasma Gun Arraymentioning

confidence: 99%

Plasma-gun-assisted field-reversed configuration formation in a conical θ-pinch

2015

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Injection of plasma via an annular array of coaxial plasma guns during the pre-ionization phase of field-reversed configuration (FRC) formation is shown to catalyze the bulk ionization of a neutral gas prefill in the presence of a strong axial magnetic field and change the character of outward flux flow during field-reversal from a convective process to a much slower resistive diffusion process. This approach has been found to significantly improve FRC formation in a conical h-pinch, resulting in a $350% increase in trapped flux at typical operating conditions, an expansion of accessible formation parameter space to lower densities and higher temperatures, and a reduction or elimination of several deleterious effects associated with the pre-ionization phase. V C 2015 AIP Publishing LLC.

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Flux and particle life-time measurements in field-reversed configurations

Cited by 58 publications

References 15 publications

Field reversed configurations

Field reversed configurations

Power balance in a high-density field reversed configuration plasma

Plasma-gun-assisted field-reversed configuration formation in a conical θ-pinch

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