Speaker
Description
X-ray free-electron lasers (XFELs) require electron beams with low emittance, high peak current, and low slice energy spread. In addition to these beam parameters, the longitudinal density profile is also crucial for high-performance FEL operation, since it affects stable beam transport to the undulator line by mitigating collective effects such as coherent synchrotron radiation, etc., as well as advanced FEL generation. Accordingly, electron bunch shaping is important, and various methods have been proposed and implemented at XFEL facilities. Among them, a method exploiting the interaction between the electron beam and the optical laser in a laser heater system has been suggested. A laser heater typically increases the uncorrelated energy spread of the electron beam uniformly along the bunch to suppress microbunching instability. By selectively heating particular bunch slices and transforming the induced energy modulation into density modulation during bunch compression, the longitudinal bunch profile can be manipulated. We present simulation studies of electron bunch shaping using laser heater shaping with PAL-XFEL parameters.
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