Numerical simulation of a planar-electrostatic-wiggler field distribution and modulation on relativistic electrons

In this paper a planar electrostatic wiggler is studied by making use of the Computer Simulation Technology (CST) software, where the wiggler is performed by two parallel metallic plates: the super-plate being corrugated with sinusoidal ripples and connected to a negative voltage; the sub-plate being smooth and grounded. Simulation results confirm that a planar electrostatic wiggler has sine-function field distribution along the axial distance. Necessity of compensation by adding a transverse magnetic field is demonstrated when it is used to modulate the motion of relativistic electrons.