Speaker
Description
Transverse beam profile diagnostics constitute a critical component in free-electron laser (FEL) operation and optimization. As a standard diagnostic tool, optical transition radiation (OTR) has been widely adopted in FEL facilities. However, as the bunch longitudinal length below 500 fs, the OTR method becomes significantly affected by coherent effects. This paper presents a systematic approach employing fluorescent screens combined with spatial separation measurement methodology to effectively circumvent coherent optical transition radiation (COTR) interference while achieving high-precision measurements. Experimental results obtained at the SXFFL demonstrate the system's capability to resolve beam spikes smaller than 20 μm, with agreement observed in comparison with wire scanner measurements.
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