scholarly journals Circular dichroism measurements at an x-ray free-electron laser with polarization control

2016 ◽  
Vol 87 (8) ◽  
pp. 083113 ◽  
Author(s):  
G. Hartmann ◽  
A. O. Lindahl ◽  
A. Knie ◽  
N. Hartmann ◽  
A. A. Lutman ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Polarization Control ◽  
Circular Dichroïsm

scholarly journals Femtosecond X-ray magnetic circular dichroism absorption spectroscopy at an X-ray free electron laser

2016 ◽  
Vol 87 (3) ◽  
pp. 033110 ◽  
Author(s):  
Daniel J. Higley ◽  
Konstantin Hirsch ◽  
Georgi L. Dakovski ◽  
Emmanuelle Jal ◽  
Edwin Yuan ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectroscopy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Circular Dichroïsm

scholarly journals Polarization control in an X-ray free-electron laser

2016 ◽  
Vol 10 (7) ◽  
pp. 468-472 ◽  
Author(s):  
Alberto A. Lutman ◽  
James P. MacArthur ◽  
Markus Ilchen ◽  
Anton O. Lindahl ◽  
Jens Buck ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Polarization Control

Polarization control of an X-ray free-electron laser with a diamond phase retarder

2014 ◽  
Vol 21 (3) ◽  
pp. 466-472 ◽  
Author(s):  
Motohiro Suzuki ◽  
Yuichi Inubushi ◽  
Makina Yabashi ◽  
Tetsuya Ishikawa
Keyword(s):  
Circular Polarization ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Rays ◽  
Horizontal Polarization ◽  
X Ray ◽  
Polarization Control ◽  
Diamond Phase ◽  
Thick Crystal ◽  
High Degree

A diamond phase retarder was applied to control the polarization states of a hard X-ray free-electron laser (XFEL) in the photon energy range 5–20 keV. The horizontal polarization of the XFEL beam generated from the planar undulators of the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) was converted into vertical or circular polarization of either helicity by adjusting the angular offset of the diamond crystal from the exact Bragg condition. Using a 1.5 mm-thick crystal, a high degree of circular polarization, 97%, was obtained for 11.56 keV monochromatic X-rays, whereas the degree of vertical polarization was 67%, both of which agreed with the estimations including the energy bandwidth of the Si 111 beamline monochromator.

Polarization Control of Shanghai Soft X-Ray Free-Electron Laser Facility

2020 ◽  
Vol 47 (5) ◽  
pp. 0500015
Author(s):  
高张峰 Gao Zhangfeng ◽  
邓海啸 Deng Haixiao ◽  
刘波 Liu Bo ◽  
王东 Wang Dong
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Polarization Control ◽  
Laser Facility

scholarly journals Proposal of X-ray absorption spectroscopy and magnetic circular dichroism using broadband free-electron lasers

2019 ◽  
Vol 26 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Bangjie Deng ◽  
Jiawei Yan ◽  
Qingmin Zhang ◽  
Yaodong Sang ◽  
Haixiao Deng
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectroscopy ◽  
Free Electron ◽  
Magnetic Circular Dichroism ◽  
Single Shot ◽  
Free Electron Lasers ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm

X-ray free-electron lasers (XFELs) have been widely used for applications such as X-ray crystallography and magnetic spin probes because of their unprecedented performance. Recently, time-resolved X-ray magnetic circular dichroism (XMCD) with ultrafast XFEL pulses have made it possible to achieve an instantaneous view of atomic de-excitation. However, owing to the narrow bandwidth and coherence of XFELs, X-ray absorption spectroscopy (XAS) and XMCD are time- and effort-consuming for both machine scientists and users of XFELs. In this work, an efficient scheme using a broadband XFEL pulse and single-shot X-ray spectrometer is proposed, in which the XAS and XMCD measurements can be accomplished with the same machine conditions. An evolutionary multi-objective optimization algorithm is used to maximize the XFEL bandwidth offered by the Shanghai Soft X-ray FEL user facility without additional hardware. A numerical example using MnO is demonstrated, showing that, by using approximately 1000 consecutive XFEL shots with a central photon energy of 650 eV and full bandwidth of 4.4%, precise spectral measurements for XAS and XMCD can be achieved. Additional considerations related to single-shot XAS and XMCD are discussed.

scholarly journals Polarization control with an X-ray phase retarder for high-time-resolution pump–probe experiments at SACLA

2019 ◽  
Vol 26 (4) ◽  
pp. 1139-1143 ◽  
Author(s):  
Y. Kubota ◽  
M. Suzuki ◽  
T. Katayama ◽  
K. Yamamoto ◽  
K. Tono ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Time Resolution ◽  
Free Electron ◽  
Free Electron Laser ◽  
Dynamical Theory ◽  
High Time Resolution ◽  
Pump Probe ◽  
X Ray ◽  
Polarization Control ◽  
High Degree

Control of the polarization of an X-ray free-electron laser (XFEL) has been performed using an X-ray phase retarder (XPR) in combination with an arrival timing diagnostic on BL3 of the SPring-8 Angstrom Compact free-electron LAser (SACLA). To combine with the timing diagnostic, a pink beam was incident on the XPR crystal and then monochromated in the vicinity of samples. A high degree of circular polarization of ∼97% was obtained experimentally at 11.567 keV, which agreed with calculations based on the dynamical theory of X-ray diffraction. This system enables pump–probe experiments to be operated using circular polarization with a time resolution of 40 fs to investigate ultrafast magnetic phenomena.

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