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Femtosecond X-ray pulse length characterization at the LCLS free electron laser
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File | Description | Size | Format | |
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Duesterer_NewJPhys_2011.pdf | 363.81 KB |
Date Issued
September 2011
Date Available
10T14:25:22Z April 2012
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.
Sponsorship
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
Subject – LCSH
Light sources
Free electron lasers
Picosecond pulses
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
1367-2630 (Online)
This item is made available under a Creative Commons License
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