Direct Laser-Driven Electron Acceleration and Energy Gain in Helical Beams

Figure 4

The energy gained from laser pulses with  fs and of  PW power with red, blue, and black correspondingly as a function of the same initial radial position of electrons. (a0, b0) The energy gained from a Gaussian laser pulse corresponding to CP and LP pulses, which are plotted with “o” and “x,” respectively. (a1, b1) The energy gained as a function of the initial radial position in helical CP and LP beams, (a2, b2) and (a3, b3) helical CP and LP beams, and (a4, b4) and (a5, b5) helical CP and LP beams.