Time: 2011-04-27 13:00:00
Speaker: Dongjian Liu, Chenglong Zhang [IFTS]
Place: Rm. 413, Bld. 11#, Yuquan Campus
Abstract:
Speaker：Dongjian Liu
A finite-mass fluid electron simulation model for low-frequency electromagnetic waves in magnetized plasmas
Abstract ：A finite-mass fluid electron model has been developed for simulating low-frequency electromagnetic waves in finite-beta magnetized plasmas. Here, beta is the ratio between plasma and magnetic pressures. It is demonstrated in slab geometry that the model successfully exhibits the linear properties of both the kinetic and inertial Alfvén waves as well as the theoretically predicted collisionless tearing mode instability
Speaker：Chenglong Zhang
Explosive Magnetic Reconnection Phase in Nonlinear Double Tearing Mode
Abstract: The nonlinear dynamic evolution of DTM is systematically investigated for different guiding fields and separation distances of the two resonant surfaces. It is found that the weaker driving plasma flow for the stronger guiding field decreases the coupling of the two resonant surfaces, or slows down the development of the DTMs. The maximum reconnection rate during the nonlinear growth phase decreases with increase of the guiding magnetic field. The distance between two current sheets is an important parameter. For the cases with a small distance, a nonlinear explosive phase of magnetic reconnection is not observed. The growth rate of kinetic energy decreases with increase of the guiding field for different separations of the current sheets.
