Flute mode turbulence plays an important role in numerous applications,such as tokamak,Z-pinch,space and astrophysical plasmas.In a low beta plasma flute oscillations are electrostatic and in the nonlinear stage they ...Flute mode turbulence plays an important role in numerous applications,such as tokamak,Z-pinch,space and astrophysical plasmas.In a low beta plasma flute oscillations are electrostatic and in the nonlinear stage they produce large scale density structures co-mingling with short scale oscillations.Large scale structures are responsible for the enhanced transport across the magnetic field and appearance of short scales leads to ion heating,associated with the ion viscosity.In the present paper nonlinear equations which describe the nonlinear evolution of the flute modes treated as compressible electromagnetic oscillations in a finite beta inhomogeneous plasma with nonuniform magnetic field are derived and solved numerically.For this purpose the 2D numerical code FLUTE was developed.Numerical results show that even in a finite beta plasma flute mode instability can develop along with formation of large scale structures co-existing with short scale perturbations in the nonlinear stage.展开更多
基金This work was supported by the United States Department of Energy under the follow-ing grants:Grant No.DE-FC52-01NV14050 at the University of Nevada at Reno,Grant No.DE-AC04-94AL85000 at Sandia National LaboratoriesSandia is amultiprogramlab-oratory operated by Sandia Corporation,a Lockheed Martin Company,for the U.S.DOE under Contract DE-AC04-94AL85000.
文摘Flute mode turbulence plays an important role in numerous applications,such as tokamak,Z-pinch,space and astrophysical plasmas.In a low beta plasma flute oscillations are electrostatic and in the nonlinear stage they produce large scale density structures co-mingling with short scale oscillations.Large scale structures are responsible for the enhanced transport across the magnetic field and appearance of short scales leads to ion heating,associated with the ion viscosity.In the present paper nonlinear equations which describe the nonlinear evolution of the flute modes treated as compressible electromagnetic oscillations in a finite beta inhomogeneous plasma with nonuniform magnetic field are derived and solved numerically.For this purpose the 2D numerical code FLUTE was developed.Numerical results show that even in a finite beta plasma flute mode instability can develop along with formation of large scale structures co-existing with short scale perturbations in the nonlinear stage.
