Diffractive–refractive optics in the Laue case: first experiment

Hrdý, J.; Mocella, Vito; Oberta, P.; Peverini, Luca; Potlovskiy, K.

doi:10.1107/s0909049506021431

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…This change of exit beam path can be used for sagittal focusing, as was demonstrated by Hrdý & Siddons (1999) and Hrdý (1998). Focusing based on diffractive-refractive optics was also studied and experimentally proved in the Laue regime (Hrdý et al, 2006). It was found that sagittal focusing occurs with the correct crystal surface shape: a longitudinal parabolic groove.…”

Section: Introductionmentioning

confidence: 84%

Diffractive–refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces

Oberta

Mikulı́k

Kittler

et al. 2009

J Synchrotron Radiat

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Based on analytical formulae calculations and ray-tracing simulations a low-aberration focal spot with a high demagnification ratio was predicted for a diffractive-refractive crystal optics device with parabolic surfaces. Two Si(111) crystals with two precise parabolic-shaped grooves have been prepared and arranged in a dispersive position (+,-,-,+) with high asymmetry. Experimental testing of the device at beamline BM05 at the ESRF provided a focal spot size of 38.25 microm at a focal distance of 1.4 m for 7.31 keV. This is the first experiment with a parabolic-shaped groove; all previous experiments were performed with circular grooves which introduced extreme aberration broadening of the focal spot. The calculated and simulated focal size was 10.8 microm at a distance of 1.1 m at 7.31 keV. It is assumed that the difference between the measured and calculated/simulated focal spot size and focal distance is due to insufficient surface quality and to alignment imperfection.

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Section: Introductionmentioning

confidence: 84%

Diffractive–refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces

Oberta

Mikulı́k

Kittler

et al. 2009

J Synchrotron Radiat

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“…The first experiment with a highly asymmetric focusing Laue crystal was performed at the ESRF (beamline BM05) and published in [10]. To summarize the experiment: a Laue crystal, Fig.…”

Section: First Experiment: Laue-braggmentioning

confidence: 99%

Highly asymmetric Laue focusing monochromator

Oberta¹,

Mikulı́k²,

Hrdý³

et al. 2010

AIP Conference Proceedings

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By using two highly asymmetric Laue crystals in a dispersive arrangement with a circular profile (∅ 8 mm) we have created a sagittaly focusing Laue system for the first time. The crystallographic planes (111) of the two Si crystals formed an angle of 7.95° with the entrance surface. The crystals dimensions were 40 mm × 20 mm and the diffracting surface was a 0.5 mm thick neck between the two circular profiles. The 15.35 keV diffracted beam formed an angle of 0.55° with the exit surface. The calculated focusing distance of the Laue-Laue focusing system was 14 m.

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“…Beam shaping based on diffractive-refractive optics has been previously studied and demonstrated by our group at the Institute of Physics of the Academy of Sciences of the Czech Republic. Both Bragg (Hrdý, 1998) and Laue (Hrdý et al, 2006) diffraction approaches have been demonstrated. Based on theoretical calculations (Hrdý & Oberta, 2008) and raytracing simulations (Artemiev et al, 2004), various applications for diffractive-refractive optics were proposed and tested at synchrotron facilities.…”

Section: Introductionmentioning

confidence: 99%

X-ray collimation by crystals with precise parabolic holes based on diffractive–refractive optics

Oberta

Mikulik

Kittler

et al. 2011

J Synchrotron Radiat

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Two crystals with precise parabolic holes were used to demonstrate sagittal beam collimation by means of a diffractive-refractive double-crystal monochromator. A new approach is introduced and beam collimation is demonstrated. Two Si(333) crystals with an asymmetry angle of α = 15° were prepared and arranged in a dispersive position (+,-,-,+). Based on theoretical calculations, this double-crystal set-up should provide tunable beam collimation within an energy range of 6.3-18.8 keV (Θ(B) = 71-18.4°). An experiment study was performed on BM05 at ESRF. Using 8.97 keV energy, the beam profile at various distances was measured. The experimental results are in good agreement with theoretical predictions. Owing to insufficient harmonic suppression, the collimated (333) beam was overlapped by horizontally diverging (444) and (555) beams.

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Diffractive–refractive optics in the Laue case: first experiment

Cited by 7 publications

References 9 publications

Diffractive–refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces

Diffractive–refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces

Highly asymmetric Laue focusing monochromator

X-ray collimation by crystals with precise parabolic holes based on diffractive–refractive optics

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