Systematic fluctuations in the pulse–pulse intensity profile of a MHz X-ray free-electron laser (FEL) source have been observed that are not described by fundamental FEL theory. The sensitivity of these… Click to show full abstract
Systematic fluctuations in the pulse–pulse intensity profile of a MHz X-ray free-electron laser (FEL) source have been observed that are not described by fundamental FEL theory. The sensitivity of these fluctuations to modifications of the electron-beam orbit in the accelerator is demonstrated as a potential route to beam optimization.
               
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