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TY - UNPB AU - Vetter, S. ED - Tavares, Daniel ED - Picoreti, Renan ED - Bruno, Gustavo ED - Marques, Sergio ED - Schaa, Volker R.W. TI - Optimization of Lasers in Electron Accelerator Applications J2 - Proc. of IBIC2020, Santos, Brazil, 14-18 September 2020 CY - Santos, Brazil T2 - International Beam Instrumentation Conference T3 - 9 LA - english AB - Lasers are increasingly used at electron accelerator facilities both to produce high brightness beams and to modify the properties of the bunches to optimize FEL performance at the LCLS. We describe techniques for controlling and measuring the position, intensity and spatial profile of the laser at the cathode. These measurements must be performed on a bunch by bunch basis in order to monitor stability and pulse to pulse jitter at 120 Hz in our copper linac and up to 1 MHz in the new superconducting linac for LCLS-II. Additionally, IR laser beams are overlapped with the electron beam within a wiggler to modulate the energy of the electron bunch to increase the slice energy spread and offset microbunching instabilities that degrade the FEL performance. We describe the critical laser parameters for such laser heaters and the techniques for controlling the spatial and temporal overlap of laser and electron beams. Moreover diagnostics such as cross-correlation measurements are performed to verify the cathode drive laser pulse length. Finally, we give an overview of laser measurements applied to novel bunch compression schemes for producing attosecond bunches at the XLEAP experiment. PB - JACoW Publishing CP - Geneva, Switzerland ER -