Sub-fs precision measurement of relative x-ray arrival time for FELs

by Dr Nick Hartmann

Monday 13 Jan 2014, 16:00 → 17:00 Europe/Zurich

WBGB 019

Today’s brightest coherent x-ray sources, x-ray free electron lasers (XFELs), produce ultrafast x-ray pulses with measured FWHM durations as short as 4 fs. There has been a marked increase in the popularity of such short pulses now that optical timing techniques have begun to report x-ray/optical delay below ∼10fs RMS errors. As a result, sub-10 fs optical pulses are now being implemented at the Linac Coherent Light Source (LCLS) x-ray beam-lines, thus warranting a push to reduce the error in x-ray/optical delay measurements to the 1 fs level. The talk will focus on a new spectrogram-based technique to measure the relative x-ray/optical delay and the involved x-ray induced carrier dynamics. This single-shot relative delay measurement surpasses previous techniques by an order of magnitude and opens new horizons in time-resolved x-ray measurements thanks to the sub-1 fs temporal resolution

abstract Flyer_GFA_XFEl_Accelerator_-_Hartmann.pdf