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Description
Accelerator operators and beamline users can highly benefit from accurate and efficient measurements of FEL (free-electron laser) pulse profiles. The use of machine learning to predict such profiles is an area of rapid development in the field. This work presents recent measurements and tests at the FLASH FEL at DESY of an image-based machine learning application developed to facilitate online FEL pulse profile reconstruction. The reconstruction has been performed using machine learning predictions of the longitudinal phase-space (LPS) of electron beams unaffected by the FEL process, originally measured using a transverse deflecting structure. The predictions were used in combination with longitudinal measurements of the LPS of the electron beam after lasing, which does not interfere with delivery to users, to reconstruct the FEL pulse. The results of the reconstruction process have been validated using correlations with well calibrated FEL power diagnostics.
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