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CUTIE: Difference between revisions
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CUTIE is a quasi-neutral two-fluid computer model for turbulence in a toroidal plasma. | CUTIE is a quasi-neutral two-fluid computer model for turbulence in a toroidal plasma. | ||
<ref>[http://dx.doi.org/10.1088/0741-3335/42/12B/320 A. Thyagaraja, Plasma Phys. Control. Fusion '''42''' (2000) B255]</ref> | |||
<ref>[http://dx.doi.org/10.1016/j.euromechflu.2003.10.009 A. Thyagaraja, P.J. Knight, and N. Loureiro, Eur. Journal of Mech. B/Fluids '''23''' (2004) 475]</ref> | |||
<ref>[http://link.aps.org/doi/10.1103/PhysRevLett.94.035002 M.R. de Baar, A. Thyagaraja, G.M.D. Hogeweij, P.J. Knight, and E. Min, Phys. Rev. Lett. '''94''' (2005) 035002]</ref> | |||
<ref name="cutie">[http://link.aip.org/link/?PHPAEN/12/090907/1 A. Thyagaraja, P.J. Knight, M.R. de Baar, G.M.D. Hogeweij, and E. Min, Phys. Plasmas '''12''' (2005) 090907]</ref> | |||
The large aspect ratio tokamak ordering is used (''R/a >> 1''), and ''B<sub>p</sub> << B<sub>tor</sub>, β << 1''. | The large aspect ratio tokamak ordering is used (''R/a >> 1''), and ''B<sub>p</sub> << B<sub>tor</sub>, β << 1''. | ||
The plasma modelled consists of electrons and a single ion species. | The plasma modelled consists of electrons and a single ion species. | ||
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the electrostatic potential (Φ) and the parallel vector potential (Ψ). | the electrostatic potential (Φ) and the parallel vector potential (Ψ). | ||
The poloidal magnetic field (and consequently the safety factor, ''q'') evolves in time. | The poloidal magnetic field (and consequently the safety factor, ''q'') evolves in time. | ||
[[File:CUTIE.jpg|265px|thumb|right|Density fluxtuations in a CUTIE simulation (from <ref name="cutie"/>)]] | |||
The code solves the evolution on the meso-scale level (larger than the ion gyroradius), co-evolving the [[Flux surface|flux surface]] averaged quantities and the turbulence in a self-consistent manner; | The code solves the evolution on the meso-scale level (larger than the ion gyroradius), co-evolving the [[Flux surface|flux surface]] averaged quantities and the turbulence in a self-consistent manner; | ||
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linear and non-linear shear Alfvén waves, slow magneto-acoustic modes, drift-tearing modes, ballooning modes (ideal and viscoresistive), and the fluid branch of the ion temperature gradient (ITG) instability. | linear and non-linear shear Alfvén waves, slow magneto-acoustic modes, drift-tearing modes, ballooning modes (ideal and viscoresistive), and the fluid branch of the ion temperature gradient (ITG) instability. | ||
The code contains sufficient mechanisms for the generation of sheared flow by turbulence and produces a spontaneous confinement transition similar to the [[H-mode|L-H transition]] in experimental devices. | The code contains sufficient mechanisms for the generation of sheared flow by turbulence and produces a spontaneous confinement transition similar to the [[H-mode|L-H transition]] in experimental devices. | ||
== Code history == | == Code history == | ||