Record Details

Title:
Polarization control in an X-ray free-electron laser
Topic:
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. 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.
Imprint:
London [u.a.], Nature Publ. Group, 2016
Journal Information:
Nat. Photonics, 10, 7, 468 - 472 (2016)
ISSN:
1749-4885
1749-4893
External related publications:
Language(s):
English


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 Record created 2016-10-11, last modified 2017-08-31

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