Microtearing Modes in Low Collisionality NSTX Discharges

Recently, a new unified fluid/kinetic MTM model is developed and incorporated into theMulti-Mode Model (MMM). The MTM model has been found to reproduce many of the linear gyrokinetic results predicted in NSTX discharges, such as the variation of real frequency and growth rates with poloidal wavenumber, beta, and electron temperature (T e ) and density gradients. A particularly important result is that the model recovers the non-monotonic dependence of linear MTM growth rate with collision frequency