Sub-radiance and the coherence limits of FEL

A. Gover, E. Dyunin

Research output: Contribution to conferencePaperpeer-review


The e-beam and radiation wave dynamics in the radiating and non-radiating beam transport sections of Free Electron Lasers are analyzed in the collective regime by use of a single transverse mode linear response formulation. This is employed to derive conditions for coherent operation of seeded high gain FELs. It is shown that the level of incoherent self-amplified spontaneous emission (SASE) radiation power can be controlled by adjusting the plasma oscillation phase in the non-radiating beam transport sections preceding the FEL, and that at short wavelengths the FEL coherence is limited by energy noise (rather than current shot-noise), and ultimately by quantum noise.

Original languageEnglish
Number of pages4
StatePublished - 2010
Event32nd International Free Electron Laser Conference, FEL 2010 - Malmo City, Sweden
Duration: 23 Aug 201027 Aug 2010


Conference32nd International Free Electron Laser Conference, FEL 2010
CityMalmo City


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