Time: Friday, Nov. 6, 10:00 am
Venue: Rm. 413, Bld. 11#, Yuquan Campus
Speaker #1: 章晓海
Title: Surface plasmon enhance transmission
Abstract: Surface plasmon is an electromagnetic excitation existing on the surface of metal or plasma. These plasmons are propagating along the interface between two media which have permittivities or permeabilities with opposite signs, whose electromagnetic field decays exponentially with distance from the surface. Surface plasmons will enhance light transmission.
Speaker #2: 李胜明
Title: Linear gyrokinetic simulation of isotope effect on turbulent transport in tokamak plasmas Abstract: Isotope effect on the turbulent transport is an important issue in toroidal burning plasmas. In this work, linear simulations using Gyrokinetic Toroidal Code (GTC) with cyclone base case parameters are carried out to study isotopic dependence of hydrogen isotopes (H, D and T) on typical electrostatic drift wave type instabilities such as ion temperature gradient (ITG) mode and trapped electron mode (TEM). Simulations reveal that the growth rate, real frequency of the ITG and TEM instabilities have isotope dependence, which critically depends on the involvement of kinetic electrons. The linear growth spectrum of ITG is shrunk toward lower m mode due to the increase of gyroradius from H to T, while the TEM growth spectral is shifted toward higher m mode. The maximum growth rate γmax of ITG depends weakly on the isotopic mass, but γmax of TEM increases rapidly as isotopic mass increases. The critical value of poloidal wavenumber, kθcrit, at which the linear wave starts to propagate from ion diamagnetic direction to electron diamagnetic direction , is found to be inversely proportional to the isotope gyroradius. The isotope scaling of ITG and TEM instabilities and its implications in the scaling of turbulent transport is also discussed in this talk.