Achieving a long-lived high-beta plasma state by energetic beam injection

Guo, H.Y.; Binderbauer, Michl; Tajima, T.; Milroy, R. D.; Steinhauer, L. C.; Yang, Xiaokang; Garate, E.; Gota, H.; Korepanov, S.; Nečas, Aleš; Roche, T.; Smirnov, A.; Trask, E.

doi:10.1038/ncomms7897

Cited by 52 publications

(39 citation statements)

References 48 publications

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“…To date, the C-2 campaign has succeeded in demonstrating significantly longer and reproducible confinement using NBI. [14][15][16] Analysis of data from over 40 000 C-2 discharges is ongoing with great need for simulation and theoretical analysis to rigorously understand transport scaling.…”

Section: Introductionmentioning

confidence: 99%

Gyrokinetic particle simulation of a field reversed configuration

et al. 2016

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Gyrokinetic particle simulation of the field-reversed configuration (FRC) has been developed using the gyrokinetic toroidal code (GTC). The magnetohydrodynamic equilibrium is mapped from cylindrical coordinates to Boozer coordinates for the FRC core and scrape-off layer (SOL), respectively. A field-aligned mesh is constructed for solving self-consistent electric fields using a semi-spectral solver in a partial torus FRC geometry. This new simulation capability has been successfully verified and driftwave instability in the FRC has been studied using the gyrokinetic simulation for the first time. Initial GTC simulations find that in the FRC core, the ion-scale driftwave is stabilized by the large ion gyroradius. In the SOL, the driftwave is unstable on both ion and electron scales. V C 2016 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Gyrokinetic particle simulation of a field reversed configuration

et al. 2016

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“…As a result, contrary to experimental evidence three-dimensional (3D) MHD and Hall-MHD simulations predict destruction of unsustained FRCs by the tilt mode regardless of their shapes [1,2]. Therefore, while MHD is capable of providing qualitative description of the formation, acceleration and translation of axisymmetric FRCs [2] and Hall-MHD is sufficient enough (albeit with relatively high viscosity and resistivity) to yield the sustainment of 3D FRCs with energetic ion beams [3] and rotating magnetic fields [4], the 3D formation and stability of theta-pinch formed FRCs can be only studied in full detail with kinetic ion models [2]. Fullparticle codes are still incapable of simulating large-scale magnetized objects like FRCs under realistic experimental conditions.…”

Section: Introductionmentioning

confidence: 86%

Formation, spin-up, and stability of field-reversed configurations

Omelchenko¹

2015

Phys. Rev. E

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Formation, spontaneous spin-up, and stability of θ-pinch formed field-reversed configurations are studied self-consistently in three dimensions with a multiscale hybrid model that treats all plasma ions as full-orbit collisional macroparticles and the electrons as a massless quasineutral fluid. The end-to-end hybrid simulations reveal poloidal profiles of implosion-driven fast toroidal plasma rotation and demonstrate three well-known discharge regimes as a function of experimental parameters: the decaying stable configuration, the tilt unstable configuration, and the nonlinear evolution of a fast growing tearing mode.

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“…There is a "benign" n=1 wobble of the FRC present that does not appear to cause FRC radial contraction (loss of diamagnetism), or substantial radial losses [17,20,28]. In later shots, where a second plasma gun has been employed in the north divertor, the n=1 and n=2 modes have been stabilized [17,29]. Fig.…”

Section: Density Fluctuations and Exb Flowmentioning

confidence: 99%

Control of ion gyroscale fluctuations via electrostatic biasing and sheared E×B flow in the C-2 field reversed configuration

Schmitz¹,

Ruskov²,

Deng³

et al. 2016

AIP Conference Proceedings

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Abstract. Control of radial particle and thermal transport is instrumental for achieving and sustaining well-confined high-β plasma in a Field-Reversed Configuration (FRC). Radial profiles of low frequency ion gyro-scale density fluctuations (0.5 ≤ kρ s ≤ 40), consistent with drift-or drift-interchange modes, have been measured in the scrape-off layer (SOL) and core of the C-2 Field-Reversed Configuration (FRC), together with the toroidal ExB velocity. It is shown here that axial electrostatic SOL biasing controls and reduces gyro-scale density fluctuations, resulting in very low FRC core fluctuation levels. When the radial ExB flow shearing rate decreases below the turbulence decorrelation rate, fluctuation levels increase substantially, concomitantly with onset of the n=2 instability and rapid loss of diamagnetism. Low turbulence levels, improved energy/particle confinement and substantially increased FRC life times are achieved when ExB shear near the separatrix is maintained via axial SOL biasing using an annular washer gun.

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Achieving a long-lived high-beta plasma state by energetic beam injection

Cited by 52 publications

References 48 publications

Gyrokinetic particle simulation of a field reversed configuration

Gyrokinetic particle simulation of a field reversed configuration

Formation, spin-up, and stability of field-reversed configurations

Control of ion gyroscale fluctuations via electrostatic biasing and sheared E×B flow in the C-2 field reversed configuration

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