CFRX, a one-and-a-quarter-dimensional transport code for field-reversed configuration studies

Hsiao, Ming-Yuan; Werley, Kenneth Alan; Ling, K.M.

doi:10.1016/0010-4655(89)90095-7

Cited by 5 publications

(1 citation statement)

References 20 publications

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“…13,15,[30][31][32][33] However, once the FRC plasmas in C-2 and C-2U [10][11][12]34 clearly reached the transport-limited regime with sufficient remedies of macro-instabilities mentioned earlier, the transport times have been found to lengthen considerably 12 and show markedly different properties of fluctuations. 35 In these FRC shots, the Q1D fluid transport code, 36 based on the CFRX code, 37 has been developed and employed for transport analysis of C-2 plasma conditions.…”

Section: Introductionmentioning

confidence: 99%

Drift-wave stability in the field-reversed configuration

et al. 2017

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Gyrokinetic simulations of C-2-like field-reversed configuration (FRC) find that electrostatic driftwaves are locally stable in the core. The stabilization mechanisms include finite Larmor radius effects, magnetic well (negative grad-B), and fast electron short circuit effects. In the scrape-off layer (SOL), collisionless electrostatic drift-waves in the ion-to-electron-scale are destabilized by electron temperature gradients due to the resonance with locally barely trapped electrons. Collisions can suppress this instability, but a collisional drift-wave instability still exists at realistic pressure gradients. Simulation results are in qualitative agreement with C-2 FRC experiments. In particular, the lack of ion-scale instability in the core is not inconsistent with experimental measurements of a fluctuation spectrum showing a depression at ion-scales. The pressure gradient thresholds for the SOL instability from simulations are also consistent with the critical gradient behavior observed in experiments.

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Section: Introductionmentioning

confidence: 99%

Drift-wave stability in the field-reversed configuration

et al. 2017

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Transport studies in high-performance field reversed configuration plasmas

et al. 2016

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A significant improvement of field reversed configuration (FRC) lifetime and plasma confinement times in the C-2 plasma, called High Performance FRC regime, has been observed with neutral beam injection (NBI), improved edge stability, and better wall conditioning [Binderbauer et al., Phys. Plasmas 22, 056110 (2015)]. A Quasi-1D (Q1D) fluid transport code has been developed and employed to carry out transport analysis of such C-2 plasma conditions. The Q1D code is coupled to a Monte-Carlo code to incorporate the effect of fast ions, due to NBI, on the background FRC plasma. Numerically, the Q1D transport behavior with enhanced transport coefficients (but with otherwise classical parametric dependencies) such as 5 times classical resistive diffusion, classical thermal ion conductivity, 20 times classical electron thermal conductivity, and classical fast ion behavior fit with the experimentally measured time evolution of the excluded flux radius, line-integrated density, and electron/ion temperature. The numerical study shows near sustainment of poloidal flux for nearly 1 ms in the presence of NBI.

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