The propagation of transverse Electromagnetic (EM) waves along a high energy relativistic electron beam passing through a neutralizing heavy ion background is investigated in the presence of an external axial magnetic field. By making use of the linearized fluid equations coupled with Maxwell’s equations the dielectric tensor and the dispersion relation of excited modes are derived. Since the electron motion is considered relativistic and fluid theory of plasma is used to describe the system, the obtained results are applicable to a vast range of high energy density regime. The mutual interaction between EM and Electron Plasma Waves (EPWs) is studied numerically. In the absence of the axial magnetic field, the EPWs and the Extraordinary Electromagnetic (EOEM) waves interact due to the existence of the self-generated magnetic field. The instability caused by this interaction has already been reported [Phys. Plasma.16, 062107 (2009) ]. We found that applying an axial magnetic field will cause deflection to plasma oscillations which enables coupling between EPWs and Ordinary Electromagnetic (OEM) waves as well. The results show that increasing the external magnetic field strength suppresses the growth rate caused by the coupling of EPWs-EOEM and passes it to the growth of EPWs-OEM. Therefore by adjusting the external magnetic field strength, the growth of EOEM and OEM modes can be controlled.

在存在外部轴向磁场的情况下，研究了横电磁波（EM）沿着穿过中和的重离子背景的高能相对论电子束的传播。通过使用线性流体方程和麦克斯韦方程，可以得出介电张量和激发模的色散关系。由于电子运动被认为是相对论的，并且使用等离子体的流体理论来描述该系统，因此所获得的结果适用于广泛的高能量密度范围。数值研究了EM与电子等离子波（EPW）之间的相互作用。在没有轴向磁场的情况下，由于自生磁场的存在，EPW和超电磁波（EOEM）相互作用。由这种相互作用引起的不稳定性已经有报道[Phys。Plasma.16，062107（2009）]。我们发现，施加轴向磁场会导致等离子体振荡发生偏转，从而使EPW和普通电磁（OEM）波之间也能够耦合。结果表明，增加外部磁场强度会抑制由EPWs-EOEM耦合引起的生长速率，并将其传递给EPWs-OEM。因此，通过调节外部磁场强度，可以控制EOEM和OEM模式的增长。结果表明，增加外部磁场强度会抑制由EPWs-EOEM耦合引起的增长率，并将其传递给EPWs-OEM。因此，通过调节外部磁场强度，可以控制EOEM和OEM模式的增长。结果表明，增加外部磁场强度会抑制由EPWs-EOEM耦合引起的增长率，并将其传递给EPWs-OEM。因此，通过调节外部磁场强度，可以控制EOEM和OEM模式的增长。