Effect of non-thermal and non-extensive parameters on electron plasma waves in hybrid Cairns-Tsallis distributed plasmas

Propagation and damping of high-frequency electron plasma or Langmuir waves (LWs) in hybrid non-thermal Cairns-Tsallis distributed plasmas (CTDP) are studied (numerically and analytically) under the well-known plasma kinetic approach based on a system of Vlasov-Poisson's equations. For such system, that is a hybrid CTDP, the longitudinal dielectric response function is derived from a 1D-reduced Cairns-Tsallis distribution function, for both super-extensive (q < 1) and sub-extensive (q > 1) cases. It reveals the effects of the simultaneous presence of non-thermal (a) and non-extensive (q) parameters on damping rate and real frequency of LWs in hybrid CTDP. It is observed that on increasing value of non-thermal parameter (alpha) and decreasing the value of non-extensive parameter (q), the real frequency of LWs is increased in both the super- and sub-extensive plasmas. On the other hand, on decreasing the value of non-extensive parameter (q) damping rate of LWs is increased in both super-extensive and sub-extensive plasmas while on increasing the value of non-thermal parameter (alpha) strong wave damping is observed in super-extensive case and the weak damping effect is found in sub-extensive plasma case. The present results (for hybrid CTDP) are distinguished from other non-thermal plasma distributions such as only Cairns or q-nonextensive plasmas. This study is utilitarian for different space plasma regions where the non-thermal and non-extensive plasma species exist.