Study on influence of different valence state under same particles on electromagnetic radiation in beam-plasma system

Summary form only given. When an intense relativistic electron beam propagates through the plasma background, the electron beam can expel the plasma electrons and leave the plasma ions which can be seen as static. In this process, the ion channel can be formed and the electromagnetic radiation can be observed. This paper uses the method called particle-in-cell to study on the influence of different valence state under same particles on electromagnetic radiation in beam-plasma system.transverse oscillations have been observed, which will be the basis of the electromagnetic radiation in the beam-plasma system. At the same time, it is also observed that most electrons have given out its energy. In the simulation, the Aluminum element has been used. When one outermost electron of Aluminum atoms is lost, the observed electromagnetic radiation frequency is 0.9035THz. And when two outermost electrons of the Aluminum atoms are lost, the observed electromagnetic radiation frequency is 1.197THz. The observed electromagnetic radiation frequency is 1.465 THz when all the outermost electrons are lost. The conclusion is that higher valence state means higher electron density in the beam-plasma system, which leads to higher electromagnetic radiation frequency.