Speaker
Description
High-brightness free-electron laser (FEL) generation critically depends on both the transverse and longitudinal properties of the electron beam, such as transverse emittance, slice energy spread. These beam parameters can be significantly degraded due to collective effects, e.g., wakefield, coherent synchrotron radiation. Such effects are pronounced due to the high current spikes, so-called current horns, formed at the head and tail of the bunch during bunch compression. To suppress the current horn formation, in general, a collimator is used in the middle of bunch compressor and removes bunch slices at both ends. However, the use of collimator is restricted in high-power machines and can introduce additional wakefield effects, complicating stable beam operation. As an alternative approach, current horn suppression using laser heater shaping has been proposed. In this presentation, we will report the experimental results of the current horn suppression via laser heater shaping and its effects for FEL generation.
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