Calculating the radiation characteristics of accelerated electrons in laser-plasma interactions

Abstract

In this paper, we studied the characteristics of radiation emitted by electrons accelerated in a laser–plasma interaction by using the Lienard–Wiechert field. In the interaction of a laser pulse with a underdense plasma, electrons are accelerated by two mechanisms: direct laser acceleration (DLA) and laser wakefield acceleration (LWFA). At the beginning of the process, the DLA electrons emit most of the radiation, and the DLA electrons emit a much higher peak photon energy than the LWFA electrons. As the laser–plasma interaction progresses, the LWFA electrons become the major radiation emitter; however, even at this stage, the contribution from DLA electrons is significant, especially to the peak photon energy.

Optical injection dynamics in two laser wakefield acceleration configurations

“…Crossing beatwave injection can be understood in a way that the stochastic heating in the combined field of both pulses shifts electrons into the wake wave where they are trapped because they gain sufficient momentum for injection directly from this wake wave. Electrons injected by laser field pre-acceleration are initially directly accelerated [31] by the drive pulse. However, in the OC3P case, these electrons are dephased by injection pulse which leads to their injection into wakefield, contrary to the case without injection pulse.…”

Galilean Non-invariance of Maxwell Equations Revisited

“…and the retarded time t r is the solution to the Equation (18). Although it may be very difficult to solve the Equation ( 18) for retarded time t r , it is clear that the retarded time t r is the function of variables x, y, z and t, and for this reason it may be written:…”

“…The equations ( 20) and ( 21) are nowadays considered the standard expressions for time retarded Liénard-Wiechert electric and magnetic fields [5,12,13] and are widely used for advanced electromagnetic calculations such as synchrotron, undulator and radar radiation [14][15][16] and in high-energy particle physics [17,18].…”

Strong Terahertz radiation generation via wakefield in collisional plasma

“…The THz radiations with frequency ranging from 100 GHz to 10 THz have applications in communication, characterization of materials, imaging, etc. These radiations can be achieved by Cherenkov wakes [5][6][7][8] and inverse Compton scattering based on X-ray radiation [9] including hard X-ray (tabletop) source [10]. Kacar et al [11] have investigated, both theoretically and experimentally, soft X-ray emissions from TIN plasmas.…”