سید محمد متولی

The propagation of solitons is studied in a tokamak plasma composed of immobile ions, hot fluid positrons and two electron sets with hot and cold temperatures with a q-non-extensive distribution. Korteweg–de Vries (KdV) equation is obtained via the reductive perturbation method (RPM). The dependence of positron-acoustic solitons on the ratio of hot /cold electrons density to positrons density, positrons temperature to temperature of hot/cold electrons, the non-extensivity parameters qeh and qec, as well as the angle between the magnetic field and wave propagation are investigated.