COMPARISON BETWEEN FEL AND CYCLOTRON RADIATION

In general,in free electron lasers there are two kinds of stimulated radiations:FELradiation and cyclotron radiation.This paper chows theoretically that if the initial transversevelocity of electron beam is large and the selected parameters for FEL are not suitable,thecyclotron radiation will be dominant,especially when the energy of electron beam is low.But thecyclotron radiation does not have double Doppler frequency upshift effect,its frequency is limitedby axial megnetic field,and when the energy of electron beam is high,the cyclotron radiationfrequency will be much lower than FEL radiation frequency.Therefore,in FEL experimentshow to distinguish these two kinds of radiations and to suppress the cyclotron radiation are veryimportant.

Comparison between FEL and cyclotron radiation

In general,in free electron lasers there are two kinds of stimulated radiations:FEL radiation and cyclotron radiation.This paper chows theoretically that if the initial transverse velocity of electron beam is large and the selected parameters for FEL are not suitable,the cyclotron radiation will be dominant,especially when the energy of electron beam is low.But the cyclotron radiation does not have double Doppler frequency upshift effect,its frequency is limited by axial megnetic field,and when the energy of electron beam is high,the cyclotron radiation frequency will be much lower than FEL radiation frequency.Therefore,in FEL experiments how to distinguish these two kinds of radiations and to suppress the cyclotron radiation are very important.