Complete polarization analysis of an APPLE II undulator using a soft X-ray polarimeter

Wang, Hongchang; Benčok, P.; Steadman, P.; Longhi, Emily; Zhu, Jingtao; Wang, Zhanshan

doi:10.1107/s0909049512034851

Cited by 31 publications

(22 citation statements)

References 26 publications

(31 reference statements)

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“…At higher photon energies ranging up to hard x rays, variable polarization undulators have been utilized in synchrotron light sources to provide circularly polarized light [9][10][11][12][13], albeit at time scales that are typically much longer (i.e., tens of ps or longer) and at peak brightnesses much below those provided in linear polarization by the new generation of soft and hard x-ray free-electron lasers (FELs) [14] such as FLASH [15], LCLS [16], and SACLA [17]. These machines were designed and currently operate with linearly polarized undulators for multiple reasons, including the desire for high magnetic fields at short undulator periods to maximize the FEL gain and lower construction cost.…”

Section: Introductionmentioning

confidence: 99%

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Allaria¹,

Diviacco²,

Callegari³

et al. 2014

Phys. Rev. X

111

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International audienceThe two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments

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Section: Introductionmentioning

confidence: 99%

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Allaria¹,

Diviacco²,

Callegari³

et al. 2014

Phys. Rev. X

111

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“…Circularly polarized X-rays with 100% degree of polarization 23 were used in normal incidence with respect to the sample plane and parallel with the applied magnetic field, in order to minimize the nonmagnetic asymmetries, as shown in Fig. 4.…”

Section: Xmcd Measurementmentioning

confidence: 99%

X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO(100)

Liu

Song

Maltby

et al. 2015

Journal of Applied Physics

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Abstract:The spin and orbital magnetic moments of the Fe 3 O 4 epitaxial ultrathin film synthesized by plasma assisted simultaneous oxidization on MgO(100) have been studied with X-ray magnetic circular dichroism (XMCD). The ultrathin film retains a rather large total magnetic moment, i.e. (2.73±0.15)μ B /f.u., which is ~ 70% of that for the bulk-like Fe 3 O 4 . A significant unquenched orbital moment up to (0.54±0.05) μ B /f.u. was observed, which could come from the symmetry breaking at the Fe 3 O 4 /MgO interface. Such sizable orbital moment will add capacities to the Fe 3 O 4 -based spintronics devices in the magnetization reversal by the electric field.

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“…F (1) is a constant provided the incident wavelength is unchanged. The incident x-rays are set to be σ polarized by the soft x-ray APPLE II undulator (the polarization is close to 100% 24 ), and the crosstalk from the polarization analyzer multilayer was measured on the direct beam to be smaller than 1%. Since all of the magnetic structures propagate along the c direction, θ -2θ scans were made along (0,0,l) at various temperatures and magnetic fields.…”

Section: Methodsmentioning

confidence: 99%

Magnetic fan structures in Ba0.5Sr1.5Zn2Fe
Hearmon
¹
,
Johnson
²
,
Beale
³

et al. 2013
Phys. Rev. B

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. (2013) 'Magnetic fan structures in Ba0.5Sr1.5Zn2Fe12O22 hexaferrite revealed by resonant soft x-ray diraction. ', Physical review B., 88 (17). p. 174413.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevB.88.174413Publisher's copyright statement:Reprinted with permission from the American Physical Society: Phys. Rev. B 88, 174413 c (2013) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The hexaferrites are known to exhibit a wide range of magnetic structures, some of which are connected to important technological applications and display magnetoelectric properties. We present data on the low magnetic field structures stabilized in a Y-type hexaferrite as observed by resonant soft x-ray diffraction. The helical spin block arrangement that is present in zero applied magnetic field becomes fanlike as a field is applied in plane. The propagation vectors associated with each fan structure are studied as a function of magnetic field, and a new magnetic phase is reported. Mean field calculations indicate this phase should stabilize close to the boundary of the previously reported phases.

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Complete polarization analysis of an APPLE II undulator using a soft X-ray polarimeter

Cited by 31 publications

References 26 publications

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO(100)

Magnetic fan structures in Ba0.5Sr1.5Zn2Fe
Hearmon
¹
,
Johnson
²
,
Beale
³

et al. 2013
Phys. Rev. B

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Complete polarization analysis of an APPLE II undulator using a soft X-ray polarimeter

Cited by 31 publications

References 26 publications

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron Laser

X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO(100)

Magnetic fan structures in Ba0.5Sr1.5Zn2FeHearmon1, Johnson2, Beale3 et al. 2013Phys. Rev. B

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Magnetic fan structures in Ba0.5Sr1.5Zn2Fe
Hearmon
¹
,
Johnson
²
,
Beale
³

et al. 2013
Phys. Rev. B