Article

The FEL SASE operation, bunch compression and the beam heater

Optics Communications (Impact Factor: 1.54). 04/2011; 284(7):1945-1950. DOI: 10.1016/j.optcom.2010.11.052
Source: arXiv

ABSTRACT We discuss the conditions required for an optimal SASE FEL operation when
bunch compression techniques are exploited to enhance the bunch peak current.
We discuss the case of velocity bunching and magnetic bunch compression. With
the reference to the latter technique we provide a quantitative estimate of the
amount of laser heater power necessary to suppress the micro-bunching
instability without creating any problem to the SASE dynamics

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    ABSTRACT: In this paper we consider the effect of laser heater on a seeded Free Electron Laser. We develop a model embedding the effect of the energy modulation induced by the heater with those due to the seeding. The present analysis is compatible with recent experimental results and earlier predictions displaying secondary maxima with increasing heater intensity. The treatment developed in the paper confirms and extends the previous analyses and put in evidence further effects which can be tested in future experiments.