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Title: Polarization control in an X-ray free-electron laser

Abstract

X-ray free-electron lasers are unique sources of high-brightness coherent radiation. However, existing devices supply only linearly polarized light, precluding studies of chiral dynamics. A device called the Delta undulator has been installed at the Linac Coherent Light Source (LCLS) to provide tunable polarization. With a reverse tapered planar undulator line to pre-microbunch the beam and the novel technique of beam diverting, hundreds of microjoules of circularly polarized X-ray pulses are produced at 500–1,200 eV. These X-ray pulses are tens of femtoseconds long, have a degree of circular polarization of 0.98–0.04+0.02 at 707 eV and may be scanned in energy. We also present a new two-colour X-ray pump–X-ray probe operating mode for the LCLS. As a result, energy differences of ΔE/E = 2.4% are supported, and the second pulse can be adjusted to any elliptical polarization. In this mode, the pointing, timing, intensity and wavelength of the two pulses can be modified.

Authors:
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  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); European XFEL GmbH, Hamburg (Germany)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Gothenburg, Gothenburg (Sweden)
  4. European XFEL GmbH, Hamburg (Germany)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Bern, Bern (Switzerland)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1332904
Report Number(s):
SLAC-PUB-16827
Journal ID: ISSN 1749-4885
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Photonics
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1749-4885
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCPHY; XFEL; applied optics; circular dichroism; free-electron lasers; optical physics

Citation Formats

Lutman, Alberto A., MacArthur, James P., Ilchen, Markus, Lindahl, Anton O., Buck, Jens, Coffee, Ryan N., Dakovski, Georgi L., Dammann, Lars, Ding, Yuantao, Durr, Hermann A., Glaser, Leif, Grunert, Jan, Hartmann, Gregor, Hartmann, Nick, Higley, Daniel, Hirsch, Konstantin, Levashov, Yurii I., Marinelli, Agostino, Maxwell, Tim, Mitra, Ankush, Moeller, Stefan, Osipov, Timur, Peters, Franz, Planas, Marc, Shevchuk, Ivan, Schlotter, William F., Scholz, Frank, Seltmann, Jorn, Viefhaus, Jens, Walter, Peter, Wolf, Zachary R., Huang, Zhirong, and Nuhn, Heinz-Dieter. Polarization control in an X-ray free-electron laser. United States: N. p., 2016. Web. doi:10.1038/nphoton.2016.79.
Lutman, Alberto A., MacArthur, James P., Ilchen, Markus, Lindahl, Anton O., Buck, Jens, Coffee, Ryan N., Dakovski, Georgi L., Dammann, Lars, Ding, Yuantao, Durr, Hermann A., Glaser, Leif, Grunert, Jan, Hartmann, Gregor, Hartmann, Nick, Higley, Daniel, Hirsch, Konstantin, Levashov, Yurii I., Marinelli, Agostino, Maxwell, Tim, Mitra, Ankush, Moeller, Stefan, Osipov, Timur, Peters, Franz, Planas, Marc, Shevchuk, Ivan, Schlotter, William F., Scholz, Frank, Seltmann, Jorn, Viefhaus, Jens, Walter, Peter, Wolf, Zachary R., Huang, Zhirong, & Nuhn, Heinz-Dieter. Polarization control in an X-ray free-electron laser. United States. doi:10.1038/nphoton.2016.79.
Lutman, Alberto A., MacArthur, James P., Ilchen, Markus, Lindahl, Anton O., Buck, Jens, Coffee, Ryan N., Dakovski, Georgi L., Dammann, Lars, Ding, Yuantao, Durr, Hermann A., Glaser, Leif, Grunert, Jan, Hartmann, Gregor, Hartmann, Nick, Higley, Daniel, Hirsch, Konstantin, Levashov, Yurii I., Marinelli, Agostino, Maxwell, Tim, Mitra, Ankush, Moeller, Stefan, Osipov, Timur, Peters, Franz, Planas, Marc, Shevchuk, Ivan, Schlotter, William F., Scholz, Frank, Seltmann, Jorn, Viefhaus, Jens, Walter, Peter, Wolf, Zachary R., Huang, Zhirong, and Nuhn, Heinz-Dieter. Mon . "Polarization control in an X-ray free-electron laser". United States. doi:10.1038/nphoton.2016.79. https://www.osti.gov/servlets/purl/1332904.
@article{osti_1332904,
title = {Polarization control in an X-ray free-electron laser},
author = {Lutman, Alberto A. and MacArthur, James P. and Ilchen, Markus and Lindahl, Anton O. and Buck, Jens and Coffee, Ryan N. and Dakovski, Georgi L. and Dammann, Lars and Ding, Yuantao and Durr, Hermann A. and Glaser, Leif and Grunert, Jan and Hartmann, Gregor and Hartmann, Nick and Higley, Daniel and Hirsch, Konstantin and Levashov, Yurii I. and Marinelli, Agostino and Maxwell, Tim and Mitra, Ankush and Moeller, Stefan and Osipov, Timur and Peters, Franz and Planas, Marc and Shevchuk, Ivan and Schlotter, William F. and Scholz, Frank and Seltmann, Jorn and Viefhaus, Jens and Walter, Peter and Wolf, Zachary R. and Huang, Zhirong and Nuhn, Heinz-Dieter},
abstractNote = {X-ray free-electron lasers are unique sources of high-brightness coherent radiation. However, existing devices supply only linearly polarized light, precluding studies of chiral dynamics. A device called the Delta undulator has been installed at the Linac Coherent Light Source (LCLS) to provide tunable polarization. With a reverse tapered planar undulator line to pre-microbunch the beam and the novel technique of beam diverting, hundreds of microjoules of circularly polarized X-ray pulses are produced at 500–1,200 eV. These X-ray pulses are tens of femtoseconds long, have a degree of circular polarization of 0.98–0.04+0.02 at 707 eV and may be scanned in energy. We also present a new two-colour X-ray pump–X-ray probe operating mode for the LCLS. As a result, energy differences of ΔE/E = 2.4% are supported, and the second pulse can be adjusted to any elliptical polarization. In this mode, the pointing, timing, intensity and wavelength of the two pulses can be modified.},
doi = {10.1038/nphoton.2016.79},
journal = {Nature Photonics},
number = 7,
volume = 10,
place = {United States},
year = {2016},
month = {5}
}

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