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Separatrix shape of field-reversed configuration
Physics of Plasmas, 2010A method of determining three parameters of a separatrix shape on a field-reversed configuration plasma is described. The three parameters are center radius a, length b (half-distance between X-points), and shape index n when the separatrix radius rs is approximated by the radial position derived from the relationship r2/a2+|z|n/bn=1.
Yasunori Ohkuma +3 more
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Mirror Effect on Radius of Separatrix in Field Reversed Configuration
Journal of the Physical Society of Japan, 1984The separatrix radius can be increased by application of external mirror field. This is concluded by a thought experiment and confirmed numerically. The radius depends not only on the average beta ratio but also on configuration of the applied external field and the separatrix length.
Kiyomitsu Suzuki, Shigeo Hamada
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Separatrix shapes and internal structures of a field-reversed configuration plasma
Physics of Plasmas, 2003The separatrix shape of a field-reversed configuration plasma is determined in comparison with measured fluxes surrounding the plasma and the solution of the Grad–Shafranov equation with an edge-layer plasma in the open field region. A reconnection point of the bias field, an outgoing flow of torn plasmas and a large amplitude ripple on the separatrix ...
Hiroshi Gota +4 more
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Beta value at separatrix of field-reversed configuration
Physics of Plasmas, 2009A pressure profile inside and outside a separatrix of a field-reversed configuration is determined by comparing three types of assumed pressure profiles with the radial profile of bremsstrahlung. It is found that the pressure profile is flatter near the field null than the rigid rotor profile.
Taeko Ikeyama +3 more
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Separatrix shape measurement on field-reversed configuration plasmas
Review of Scientific Instruments, 2003In order to determine the separatrix shapes of field-reversed configuration plasmas with high accuracy, an iterative method that compares measured magnetic fluxes with the solution of the Grad–Shafranov equation is discussed in detail. Several suggestions for successfully treating the iterative method are given using numerical simulation and a mock-up ...
Hiroshi Gota +5 more
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Numerical Confirmation of Closed Separatrix in Experimental Field Reversed Configurations
Journal of the Physical Society of Japan, 1986Field reversed configurations in recent experiments such as FRX-C, OCT and NUCTE are numerically studied by solving the Grad-Shafrarnov equation. The beta profiles used in the calculation have been inferred from the experimental data with use of one dimensional model of FRC. The calculated values of the separatrix radii well agree with the experimental
Kiyomitsu Suzuki, Shigeo Hamada
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Control of Equilibrium Separatrix Shape on Field-Reversed-Configuration Plasmas
Fusion Technology, 1995Equilibrium shape of a field-reversed-configuration plasma is controlled to maximize its poloidal flux. Plasma elongation is changed from 7.5 to 4.5 by adding a local field to the plasma due to the introduction of a control coil. The plasma shape modifies while keeping its volume and the product of its poloidal flux and elongation constant.
Tsutomu Takahashi +2 more
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Physics of Plasmas, 2020
A quasi-neutral blended drift-Lorentz particle model of the field-reversed configuration (FRC) has been developed and implemented in the particle-in-cell code named ANC. A field-aligned mesh and corresponding mesh operations are constructed for solving self-consistent electric fields in FRC geometry.
C. K. Lau +7 more
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A quasi-neutral blended drift-Lorentz particle model of the field-reversed configuration (FRC) has been developed and implemented in the particle-in-cell code named ANC. A field-aligned mesh and corresponding mesh operations are constructed for solving self-consistent electric fields in FRC geometry.
C. K. Lau +7 more
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Physics of Plasmas, 2017
We present a linear, one-parameter model for rigid displacement of a toroidally symmetric plasma. When the feedback control is feasible, plasma inertia can be neglected, and the instability growth rate is proportional to wall resistivity. We benchmark the linear model against non-linear, hybrid simulations of an axially unstable, beam-driven field ...
N. Rath +4 more
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We present a linear, one-parameter model for rigid displacement of a toroidally symmetric plasma. When the feedback control is feasible, plasma inertia can be neglected, and the instability growth rate is proportional to wall resistivity. We benchmark the linear model against non-linear, hybrid simulations of an axially unstable, beam-driven field ...
N. Rath +4 more
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Tilt stabilization by cycling ions crossing magnetic separatrix in a field-reversed configuration
Physics of Plasmas, 1997The stabilization of the tilt disruption in a field-reversed configuration is investigated by means of a three-dimensional particle simulation. The growth rate of tilting instability decreases as the plasma beta value at magnetic separatrix βsp increases, while it is slightly affected by the finite ion Larmor radius parameter s̄ and the hollowness ...
Kazumi Nishimura +2 more
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