Abstract
A simplified one-dimensional theoretical model for free-electron laser oscillator (FELO) calculation which reserves the main physics is proposed. Instead of using traditional macroparticles sampling method, the theoretical model takes advantage of low gain theory to calculate the optical power single-pass gain in the undulator analytically, and some reasonable approximations are made to simplify the calculation of power growth in the cavity. The theoretical analysis of single-pass gain, power growth, time-dependent laser profile evolution and cavity desynchronism are accomplished more efficiently. We present the results of infrared wavelength FELO and X-ray FELO with the new model. The results are validated by simulation with GENESIS and OPC.
Highlights
Free-electron laser (FEL) is a new light source which uses relativistic electron beam passes through the undulator and interacts with the radiation field to generate high brilliance laser pulses
We present the results of infrared wavelength free-electron laser oscillator (FELO) and X-ray FELO with the new model
In this paper we proposed a novel one-dimensional theoretical model which is useful for fast optimization of FELO and obtaining some results in a shorter period of time
Summary
Free-electron laser (FEL) is a new light source which uses relativistic electron beam passes through the undulator and interacts with the radiation field to generate high brilliance laser pulses. Numerous schemes, including external seeded FEL [4,5,6] and self-seeding [7,8], have been proposed to solve this problem and improve its performances Another promising operating mode is free-electron laser oscillator (FELO), which works in the low-gain region and employs electron beam to pass the undulator multiple times to convert energy to radiation. It holds a lot of potential, there are still some challenges for FELO, including high repetition rate electron injector [14], heat loading of the Bragg reflection crystal mirror [15], and X-ray optics.
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