A Study Of Undulator Induced Transparency Of Magnetized Plasma In The Linear Regime

Abstract

The phenomenon of Undulator Induced Transparency (UIT) in a magnetized plasma is a particular case of the Electromagnetically Induced Transparency (EIT) effect where the absorption of the EM wave at the electron cyclotron frequency in the plasma is eliminated by adding a pump EM field. The UIT effect take place when static helical magnetic undulator is used instead of an EM pump wave, thus enabling the coupling of the transverse and longitudinal DO waves in the plasma. The electromagnetic waves with slow group velocity are generated resulting in an extreme compression of the wave energy in the plasma. The polarization of the hybrid compressed waves are primarily longitudinal and their phase velocity is controllable by the undulator period, making UIT attractive for electron and ion acceleration. Numerical simulations (fluid and PIC) reveal several different scenarios of propagation of the EM waves in the UIT regime depending on the strength of the mode coupling between the two polarizations (right-hand and left-hand).