Novel instruments for ultra-soft X-ray emission spectroscopy

Agåker, Marcus; Andersson, Joakim; Englund, Carl-Johan; Olsson, Anders; Ström, Magnus; Nordgren, Joseph

doi:10.1016/j.nima.2008.12.227

Cited by 24 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This type of high resolution spectroscopy has been reported elsewhere using different wavelengths. 30,31 For the spatial coherence, we measure l coh % 12% in the horizontal and l coh % 15% in the vertical direction which is well within previously reported values. Following recent computational studies, the spatial coherence is reduced for high electron bunch currents (in this work >2 kA), which are typically present if high pulse energies are requested.…”

supporting

confidence: 84%

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer

Hilbert

Rödel

Brenner

et al. 2014

Applied Physics Letters

View full text Add to dashboard Cite

A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5 nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and about 12% in horizontal direction. The feasibility of measuring spatio-temporal coherence properties of XUV FEL radiation using interferometric techniques advances machine operation and experimental studies significantly.

show abstract

supporting

confidence: 84%

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer

Hilbert

Rödel

Brenner

et al. 2014

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…3 Recently, designs employing a RLS-PG and two parabolic mirrors have been described which also rely on a MCP detector. 4,5 Ways have been found around the CCD-Rowland geometry mismatch. One is to use a MCP in combination with an image intensifier-converter coupled to a CCD.…”

Section: A Optical Schemesmentioning

confidence: 99%

Design and performance of AERHA, a high acceptance high resolution soft x-ray spectrometer

Chiuzbăian

Hague

Avila

et al. 2014

Review of Scientific Instruments

View full text Add to dashboard Cite

A soft x-ray spectrometer based on the use of an elliptical focusing mirror and a plane varied line spacing grating is described. It achieves both high resolution and high overall efficiency while remaining relatively compact. The instrument is dedicated to resonant inelastic x-ray scattering studies. We set out how this optical arrangement was judged best able to guarantee performance for the 50 - 1000 eV range within achievable fabrication targets. The AERHA (adjustable energy resolution high acceptance) spectrometer operates with an effective angular acceptance between 100 and 250 μsr (energy dependent) and a resolving power well in excess of 5000 according to the Rayleigh criterion. The high angular acceptance is obtained by means of a collecting pre-mirror. Three scattering geometries are available to enable momentum dependent measurements with 135°, 90°, and 50° scattering angles. The instrument operates on the Synchrotron SOLEIL SEXTANTS beamline which serves as a high photon flux 2 × 200 μm(2) focal spot source with full polarization control.

show abstract

“…The optical design of the SXE spectrometer is based on previously developed grazing incident flat field spectrometers using a varied line spacing (VLS) grating that compromises high energy resolution and high detection efficiency. 7,21 Their features are summarized in Fig. 2.…”

Section: Optimization Of Optical Geometry and Grating Parameters Omentioning

confidence: 99%

“…25 An image processing technique called super-resolution reconstruction is applied to the detector. 7,26 Cylindrical gratings are used instead of spherical gratings in order to reduce spherical aberration that may cause severe distortion of the focal line which broadens the line image at both sides of the detector resulting from subtle misalignment of the detector. Thus the distortion inevitably lowers the energy resolution even when the line curvature of the signal is corrected for by calculation.…”

Section: Optimization Of Optical Geometry and Grating Parameters Omentioning

confidence: 99%

“…(a) Realizing an extremely small spot size for the incident beam at the sample position. (b) Using short entrance and long exit arms for the grazing incidence flat field type optical mount spectrometer 7,21 which achieves high detection efficiency and high energy resolution. (c) Applying the simplified coma-free operation mode proposed by Strocov et al 22 In this paper, we describe the design concepts, numerical optimization of the optical parameters and preliminary SXE results demonstrated for N 1s edge (402.1 eV) of hBN and Mn 2p edge (641.8 eV) of MnO.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrahigh resolution soft x-ray emission spectrometer at BL07LSU in SPring-8

Harada

Kobayashi

Niwa

et al. 2012

Review of Scientific Instruments

102

View full text Add to dashboard Cite

An extremely high resolution flat field type slit less soft x-ray emission spectrometer has been designed and constructed for the long undulator beamline BL07LSU in SPring-8. By optimizing the ruling parameters of two cylindrical gratings, a high energy resolution ΔE < 100 meV and/or an E∕ΔE ~ 10 000 are expected for the energy range of 350 eV - 750 eV taking into account the broadening by the spatial resolution (25 μm) of a CCD detector. A coma-free operation mode proposed by Strocov et al., is also applied to eliminate both defocus and coma aberrations. The spectrometer demonstrated experimentally that E/ΔE = 10 050 and 8046 for N 1s (402.1 eV) and Mn 2p (641.8 eV) edges, respectively.

show abstract

Novel instruments for ultra-soft X-ray emission spectroscopy

Cited by 24 publications

References 8 publications

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer

Design and performance of AERHA, a high acceptance high resolution soft x-ray spectrometer

Ultrahigh resolution soft x-ray emission spectrometer at BL07LSU in SPring-8

Contact Info

Product

Resources

About