Figure 3
From: Plasma channel undulator excited by high-order laser modes
Trajectory and radiation spectrum of the electron beam propagating through the plasma undulator(s). (a) The trajectory of the beam in the plasma undulator. The electron density of the beam has been normalized. The parameters of the laser pulses and plasma are the same as in Fig. 2 except that the plasma density has been tapered to lock the phase of the electrons inside the plasma wakefield. (b) The on-axis radiation spectra of the electron beam with taper (red solid line) and without taper (blue dash-dot line) using modes m 0 = 0 and m 1 = 1. The green dashed line corresponds to the case of the modes m 0 = 0 and m 1 = 3 with taper. (c) The on-axis radiation spectra from a single undulator (red line) and two phase-matched undulators (magenta line).
