Speaker
Description
The slice energy spread is a critical parameter in free-electron laser (FEL) facilities. A high-brightness injector is typically characterized by a low slice energy spread, which can induce micro-bunching instability and consequently degrade the FEL lasing process. Conventional mitigation involves controlling the slice energy spread using a laser heater, making its precise measurement essential.
Approaches has been proposed based on polynomial fitting after scanning the beam size at different energies or dispersions. However, these approaches are time consuming.
We have developed a simpler method for measuring slice energy spread by employing two screens in dispersion stage. With a proper set of parameters, we can locate the beam waist at the middle of two screens, and get the slice energy spread quickly. This method has been performed at SHINE injector. The measurement was completed in less than one hour, and the result turned out to be 2.3keV, which fits with the simulated value.
This method can greatly improve the efficiency of energy spread measurement, saving time and effort for beam diagnostics.
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