numerical studies and simulation of the lower hybrid waves current drive by using fokker – planck equation in nsst and ht-7 tokamaks

recent experiments on the spherical tokamak have discovered the conditions to create a powerful plasma and ensure easy shaping and amplification of stability, high bootstrap current and confinement energy. the spherical tours (st) fusion energy development path is complementary to the tokamak burning plasma experiment such as nstx and higher toroidal beta regimes and improves the design of a power plant. to support the st development path, one option of a next step spherical torus (nsst) device has been examined .nsst is a performance extension stage st with  a plasma current of 5-10 ma, r=1.5m, bt