Speaker
Description
We present simulations demonstrating single-cycle waveform control of undulator radiation using an ultrashort electron beam produced by a plasma wakefield accelerator. By operating in a regime where the resonant radiation wavelength exceeds the effective bunch length of the compressed current spike, the emitted electric field closely follows the structure of the undulator magnetic field. This enables direct shaping of the radiation on a sub-cycle level through undulator design. These simulations demonstrate chirped pulse generation and cycle-to-cycle polarization flipping in compact undulator configurations. To accurately model the realistic magnetic fields of these short undulators, the unaveraged FEL code Puffin was extended to accept externally defined 3D magnetic field maps, here generated using the RADIA magnetostatics package.
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