Macro-temporal structure of storage ring free electron lasers

Abstract

I derive simple dimensionless equations governing the storage ring free electron laser behaviour around a steady state of constant power and electron energy spread It is found that the laser tends to have a macro-temporal pulsed structure (in the range of milliseconds). By periodically modulating the laser gain, one can achieve a peak power much higher than the average power which stays limited by the electron energy spread induced by the laser