The linear evolution of a resistive wall mode(RWM)with magnetic shears was analytically studied in a cylindrical geometry.The incompressible magnetohydrodynamic(MHD)equations were solved by the Fourier analysis method...The linear evolution of a resistive wall mode(RWM)with magnetic shears was analytically studied in a cylindrical geometry.The incompressible magnetohydrodynamic(MHD)equations were solved by the Fourier analysis method,and various equilibrium magnetic fields were considered.The shear in the magnetic field had an unstable effect on the linear evolution of the RWM.The linear growth rate increased obviously with increase of the magnetic shear rate for higher magnetic shears.Slow plasma rotation could stabilize the RWM with low magnetic shears,but the plasma rotation could not stabilize the RWM with high magnetic shears.The stabilizing effects of the wall conductivity on the RWM are more efficient for lager magnetic shear.展开更多
Linear and nonlinear evolutions of the resistive wall mode(RWM) were numerically carried out with different plasma density profiles.Both stabilizing and destabilizing effects were observed.The plasma density shear had...Linear and nonlinear evolutions of the resistive wall mode(RWM) were numerically carried out with different plasma density profiles.Both stabilizing and destabilizing effects were observed.The plasma density shear had a stabilizing effect on the RWM,and the stabilizing effect was better as the plasma density shear rate increased.In the uniform density plasma,the effects of flowshear on the RWMstability were stronger than those for non-uniform density plasma.For lower flowshear,the effects of the plasma density shear rate on the RWMwere more obvious.In the nonlinear phase,the repulsive force associated with the piling up magnetic flux near the resistive wall prevented further growth of perturbed magnetic energy,and the RWMwas saturated.The saturation levels were almost independent of the density profiles.展开更多
基金National Science Foundation of Shangong Province of China(No.ZR2016AM30)National Natural Science Foundation of China(No.11875290)Foundation of Shandong Province Higher Educational Science and Technology Program,China(No.J15LN15)
文摘The linear evolution of a resistive wall mode(RWM)with magnetic shears was analytically studied in a cylindrical geometry.The incompressible magnetohydrodynamic(MHD)equations were solved by the Fourier analysis method,and various equilibrium magnetic fields were considered.The shear in the magnetic field had an unstable effect on the linear evolution of the RWM.The linear growth rate increased obviously with increase of the magnetic shear rate for higher magnetic shears.Slow plasma rotation could stabilize the RWM with low magnetic shears,but the plasma rotation could not stabilize the RWM with high magnetic shears.The stabilizing effects of the wall conductivity on the RWM are more efficient for lager magnetic shear.
基金National Natural Science Foundation of China(No.11175156)Natural Science Foundation of Shandong Province of China(No.ZR2016AM30)Foundation of Shandong Province Higher Educational Science and Technology Program,China(No.J12LN16)
文摘Linear and nonlinear evolutions of the resistive wall mode(RWM) were numerically carried out with different plasma density profiles.Both stabilizing and destabilizing effects were observed.The plasma density shear had a stabilizing effect on the RWM,and the stabilizing effect was better as the plasma density shear rate increased.In the uniform density plasma,the effects of flowshear on the RWMstability were stronger than those for non-uniform density plasma.For lower flowshear,the effects of the plasma density shear rate on the RWMwere more obvious.In the nonlinear phase,the repulsive force associated with the piling up magnetic flux near the resistive wall prevented further growth of perturbed magnetic energy,and the RWMwas saturated.The saturation levels were almost independent of the density profiles.
