Femtosecond X-ray pulse length characterization at the LCLS free electron laser

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Title: Femtosecond X-ray pulse length characterization at the LCLS free electron laser
Authors: Düsterer, S.
Radcliffe, P.
Bostedt, C.
Bozek, J.
Cavalieri, A.L.
Coffee, R.
Costello, John T.
Cubaynes, D.
DiMauro, L.F.
Ding, Y.
Doumy, G.
Helml, W.
Schweinberger, W.
Kienberger, R.
Maier, A.R.
Grüner, F.
Messerschmidt, M.
Richardson, V.
Roedig, C.
Tschentscher, T.
Meyer, M.
Permanent link: http://hdl.handle.net/10197/3555
Date: Sep-2011
Abstract: Two-color, single-shot time-of-flight electron spectroscopy of atomic neon was employed at the Linear Coherent Light Source (LCLS) to measure the laser-assisted Auger decay in the X-ray regime. This X-ray-optical cross correlation technique provides a straightforward, non-invasive and on-line means of determining the duration of femtosecond (> 40 fs) X-ray pulses. In combination with a theoretical model of the process based on the soft-photon approximation, we were able to obtain the LCLS pulse duration and to extract a mean value of the temporal jitter between the optical pulses from a synchronized Ti-Sapphire laser and X-ray pulses from the LCLS. We find that the experimentally determined values are systematically smaller than the length of the electron bunches. Nominal electron pulse durations of 175 and 75 fs yield X-ray pulse shapes of 120 ± 20 fs FWHM and an upper limit of 40 ± 20 fs FWHM, respectively. Simulations of the SASE process using the GENESIS code agree well with the experimental results.
Funding Details: Science Foundation Ireland
Higher Education Authority
Type of material: Journal Article
Publisher: Deutsche Physikalische Gesellschaft & Institute of Physics (IOP Science)
Journal: New Journal of Physics
Volume: 13
Issue: 9
Start page: 093024-1
End page: 093024-11
Copyright (published version): 2011 Deutsche Physikalische Gesellschaft & IOP Science
Keywords: Light source
Subject LCSH: Light sources
Free electron lasers
Picosecond pulses
DOI: 10.1088/1367-2630/13/9/093024
Other versions: http://dx.doi.org/10.1088/1367-2630/13/9/093024
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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