“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 15650
School of Particles and Accelerator
  Title:   Role of plasma velocity on symmetric and antisymmetric solutions of moving solitons for electron-positron plasma
1.  Ebrahim Heidari
2.  Layla Rajaee
3.  Morteza Aslaninejad
  Status:   Published
  Journal: Plasma Physics and Controlled Fusion
  No.:  065020
  Vol.:  61
  Year:  2019
  Supported by:  IPM
The traveling relativistic solitons in electron-positron hot plasmas is investigated. The influence of the positron motion on the solitons structure is taken into account. Closed set of equations consisting of scalar potential, vector potential and enthalpy in ultra-relativistic regime is presented; symmetric and antisymmetric solitary solutions are obtained numerically. The nonlinear dispersion relation of the system is derived in the quasi-neutral limit for the purpose of analyzing the modulational instability. Also, the variations of the modulational instability growth rate are investigated. In contrast to the standing solitons, drifting velocity of moving solitons and plasma fluid velocity both play an important role in the formation of the solutions. In case the fluid velocity of the plasma overtakes the drift velocity of the solitary wave, magnitudes of the scalar and vector potentials increase with the increase of the plasma temperature, otherwise decrease. Also compared with single humped vector potentials, two humped vector potentials are excited at lower temperature if the fluid velocity exceeds the soliton drifting velocity.

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