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The X-ray Free Electron Laser (FEL) performance strongly depends on the beam emittance and peak current. Lengthening injector laser pulse can improve the injector emittance while compromising the injector peak current. With a longer laser pulse, stronger bunch compression through downstream bunch compressors is thus required to keep the same final peak current required by FEL process. This process may cause stronger micro-bunching effect. At the LCLS, we performed experiments with doubling injector laser pulse. In this paper, we present the simulation and preliminary experimental results of the injector emittance, microbunching effects and FEL performance with the long drive laser pulse.

Evaluation of FEL Performance with a Longer Injector Drive Laser Pulse at the LCLS