Recent Progress in EM-GTS code

Spherical tokamaks like NSTX-U are high beta machines where electrons anomalous transport is in a large part due to global electromagnetic drift modes such as KBM and MTM. Here we report on the recent progress in the development of the electromagnetic capabilities in the gyrokinetic code EM-GTS which is now capable of linear and non-linear simulations of finite-beta ITG, KBM and MTM modes in NTSX-U geometry.  Linear and non-linear EM-GTS simulations of the low-n MHD modes such (2,1) tearing mode which are responsible for the thermal quench will also be presented.