Simulation of Cherenkov free electron laser

by Dr Fatemeh Bazooband (Fasa University, Faculty of Fundamental sciences)

Wednesday 7 Feb 2018, 15:30 → 16:30 Asia/Tehran

Particles and Accelerators School Seminar Room (Larak)

In this study, Cherenkov free electron lasers (CFELs) are used as a terahertz light source, and their applications are described. The advantage of these lasers, is that they have a simple structure that does not require a wiggler in spite of conventional free electron lasers and the electron beam motion near the surface of waveguide, creates a necessary coupling between electromagnetic radiation and electron beam to generate a coherent amplified radiation. In addition, the energy required to have a specific frequency is much lower than that of the free-electron laser, so that the target can sometimes be achieved with an electron gun. Therefore the CFEL has a potential advantage when short wavelength and low electron beam energy is required. Low voltage compact free electron lasers operating in microwave to infrared frequency spectrum, have valuable applications in industry and medicine because of their small size and low cost. The behavior of a single electron in the single slab Cherenkov free electron laser is studied as a first step of complete simulation. Electron motion is studied to make sure that it stays in the interaction zone and does not hit the dielectric. The Lorentz force equations are used to derive a set of coupled differential equations that is solved numerically by Runge-Kutta method to simulate the electron motion in the desired structure. The present analysis makes the foundation for a complete simulation of CFEL that will be done in the near future.