Stabilization of magnetic mirror machine using rotating magnetic field

Seemann, Omri; Be'ery, Ilan; Fisher, A.

doi:10.1017/s0022377818000971

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…Beneficially, fast-ion FLR effects may mitigate turbulence as well as interchange modes by averaging over small fluctuations (k ⊥ ρ 1). An absence of turbulence was observed by TAE that was attributed to fast ions (Schmitz et al 2016). In tokamaks as well, experimental measurements on the Tokamak Fusion Test Reactor (TFTR) show that α-particles exhibit classical diffusion due to the FLR effect (Zweben et al 1997).…”

Section: Anisotropic Mhd Equilibrium and Ambipolar Potentialmentioning

confidence: 99%

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Physics basis for the Wisconsin HTS Axisymmetric Mirror (WHAM)

Endrizzi,

Anderson,

Brown

et al. 2023

J. Plasma Phys.

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The Wisconsin high-temperature superconductor axisymmetric mirror experiment (WHAM) will be a high-field platform for prototyping technologies, validating interchange stabilization techniques and benchmarking numerical code performance, enabling the next step up to reactor parameters. A detailed overview of the experimental apparatus and its various subsystems is presented. WHAM will use electron cyclotron heating to ionize and build a dense target plasma for neutral beam injection of fast ions, stabilized by edge-biased sheared flow. At 25 keV injection energies, charge exchange dominates over impact ionization and limits the effectiveness of neutral beam injection fuelling. This paper outlines an iterative technique for self-consistently predicting the neutral beam driven anisotropic ion distribution and its role in the finite beta equilibrium. Beginning with recent work by Egedal et al. (Nucl. Fusion, vol. 62, no. 12, 2022, p. 126053) on the WHAM geometry, we detail how the FIDASIM code is used to model the charge exchange sources and sinks in the distribution function, and both are combined with an anisotropic magnetohydrodynamic equilibrium solver method to self-consistently reach an equilibrium. We compare this with recent results using the CQL3D code adapted for the mirror geometry, which includes the high-harmonic fast wave heating of fast ions.

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Section: Anisotropic Mhd Equilibrium and Ambipolar Potentialmentioning

confidence: 99%

“…2019), ponderomotive effects (Ferron et al. 1987), rotating magnetic fields (Seemann, Be'ery & Fisher 2018; Zhu et al. 2019), close fitting conducting shells (Kesner 1985; Beklemishev 2016; Kotelnikov et al.…”

Section: Performance Modelling Of Whammentioning

confidence: 99%

Physics basis for the Wisconsin HTS Axisymmetric Mirror (WHAM)

Endrizzi,

Anderson,

Brown

et al. 2023

J. Plasma Phys.

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“…The application of rotating magnetic field perpendicular to the trap's axis with frequencies close to the ion-cyclotron frequency demonstrated stabilization of mirror-confined and field-reversed-configuration plasma in several experiments (Ferron et al. 1987; Seemann, Be'ery & Fisher 2018; Zhu et al. 2019).…”

Section: Magnetohydrodynamic Stabilitymentioning

confidence: 99%

Prospects for a high-field, compact break-even axisymmetric mirror (BEAM) and applications

Forest,

Anderson,

Endrizzi

et al. 2024

J. Plasma Phys.

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This paper explores the feasibility of a break-even-class mirror referred to as BEAM (break-even axisymmetric mirror): a neutral-beam-heated simple mirror capable of thermonuclear-grade parameters and $Q\sim 1$ conditions. Compared with earlier mirror experiments in the 1980s, BEAM would have: higher-energy neutral beams, a larger and denser plasma at higher magnetic field, both an edge and a core and capabilities to address both magnetohydrodynamic and kinetic stability of the simple mirror in higher-temperature plasmas. Axisymmetry and high-field magnets make this possible at a modest scale enabling a short development time and lower capital cost. Such a $Q\sim 1$ configuration will be useful as a fusion technology development platform, in which tritium handling, materials and blankets can be tested in a real fusion environment, and as a base for development of higher- $Q$ mirrors.

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“…The basic physics of MMM plasma confinement can be studied and demonstrated in a small size facility with medium temperature plasma. A proposed demonstrator is based on the current mirror machine at RPL [23]. The typical parameters of the machine with RMF heating are given in table 2.…”

Section: Concept Demonstratormentioning

confidence: 99%

Plasma confinement by moving multiple mirrors

Be'ery

Gertsman

Seeman

2018

Plasma Phys. Control. Fusion

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The achievable gain in magnetic mirrors fusion machines is limited by particles and energy flux through the mirrors. The moving multiple mirrors (MMM) concept is based on many mirror coils at each end of the trap, synchronized in sequence to generate magnetic mirror that moves towards the centre of the trap. Particles escaping from the main cell are scattered out of the loss-cone in the MMM sections and propelled back inside by the magnetic wave. Analytical optimization of the MMM parameters for a conceptual fusion mirror machine, suggests that gain >>1 can be obtained with reasonable voltage, current and power dissipation in the MMM driving system. We present the design of an experimental system aiming to explore the MMM concept and demonstrate orders of magnitude reduction in axial plasma flux.

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Stabilization of magnetic mirror machine using rotating magnetic field

Cited by 8 publications

References 19 publications

Physics basis for the Wisconsin HTS Axisymmetric Mirror (WHAM)

Physics basis for the Wisconsin HTS Axisymmetric Mirror (WHAM)

Prospects for a high-field, compact break-even axisymmetric mirror (BEAM) and applications

Plasma confinement by moving multiple mirrors

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