Speaker
Description
It has been known for decades that the intensity fluctuations of free-electron laser radiation conceal some information about the temporal characteristics of the light. In particular, by measuring the ensemble-averaged spectral intensity correlation function, one can reconstruct the average length of the x-ray pulse [1]. This method in its original form starts to break down once the electron beam has any energy chirp, which is often a feature during practical operating conditions. We recently extended the spectral intensity correlation method to linearly chirped electron beams, however this is still not completely representative of everyday beams [2]. We present here further analysis of nonlinearly chirped electron beams and their spectral statistics, and show that measurement of the spectral intensity correlation function provides non-trivial information about the nonlinear electron beam phase space and therefore the x-ray pulse phase space.
Funding Agency
Department of Energy, LDRD program at SLAC, contract DE-AC02-76SF00515. Also the Stanford Graduate Fellowship and the Stanford Siemann Fellowship.
Footnotes
[1] Lutman, A. A., et al. "Femtosecond x-ray free electron laser pulse duration measurement from spectral correlation function." Physical Review Special Topics-Accelerators and Beams 15.3 (2012): 030705.
[2] Robles, R.R., et al. "Reconstruction of x-ray free-electron laser pulse duration and energy chirp from spectral intensity fluctuations." Submitted to Physical Review Accelerators and Beams (2022).
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