On the requirements to the instrumentation for the new generation of the synchrotron radiation sources. Beryllium windows

Snigirev, A.; Snigireva, I.; Kohn, V. G.; Kuznetsov, Serguei

doi:10.1016/0168-9002(95)00849-7

Cited by 53 publications

(29 citation statements)

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“…Roughness on the beryllium surface seemed to be the primary cause for degradation (Snigirev et al, 1996). Although we initially used a polished beryllium window for the 1 km beamline, we could not suppress speckles.…”

Section: Be Windowsmentioning

confidence: 99%

Optics for coherent X-ray applications

Yabashi

Tono

Mimura

et al. 2014

J Synchrotron Radiat

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Developments of X-ray optics for full utilization of diffraction-limited storage rings (DLSRs) are presented. The expected performance of DLSRs is introduced using the design parameters of SPring-8 II. To develop optical elements applicable to manipulation of coherent X-rays, advanced technologies on precise processing and metrology were invented. With propagation-based coherent X-rays at the 1 km beamline of SPring-8, a beryllium window fabricated with the physical-vapour-deposition method was found to have ideal speckle-free properties. The elastic emission machining method was utilized for developing reflective mirrors without distortion of the wavefronts. The method was further applied to production of diffraction-limited focusing mirrors generating the smallest spot size in the sub-10 nm regime. To enable production of ultra-intense nanobeams at DLSRs, a low-vibration cooling system for a highheat-load monochromator and advanced diagnostic systems to characterize X-ray beam properties precisely were developed. Finally, new experimental schemes for combinative nano-analysis and spectroscopy realised with novel X-ray optics are discussed.

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Section: Be Windowsmentioning

confidence: 99%

Optics for coherent X-ray applications

Yabashi

Tono

Mimura

et al. 2014

J Synchrotron Radiat

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“…On the characterization of spatial coherence, classical techniques with two-wave interference cannot work well in the high photon energy region due to the high transmissivity of X-rays (Snigirev, 1996). Therefore, we would like to use a simple holographic technique, in-line holography, where a single ®bre (such as a boron ®bre) is employed, on account that holographic interference patterns are closely related to the spatial coherence of the X-ray beam.…”

Section: Approach For Spatial Coherence Evaluationmentioning

confidence: 99%

“…Some experimental results have been obtained at ESRF (Snigirev, 1996;Snigirev et al, 1996). However, it is useful if a critical value of the surface roughness is predicted, below which the effect of roughness on the spatial coherence of the X-ray beam is acceptable.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on the spatial coherence of X-ray beams from third-generation synchrotron radiation sources

Wang

Xiao

2000

J Synchrotron Radiat

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The effect of the surface roughness of optical elements, such as Be windows and re¯ection mirrors, in synchrotron radiation beamlines on the spatial coherence of the X-ray beam is investigated systematically by means of digital simulation, in which a new model for X-ray re¯ection from a rough surface is proposed. A universal factor is employed to evaluate the spatial coherence quantitatively, based on which critical values for surface roughness are reached. The results from simulation are consistent with those from experiments.

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“…Some authors have called this degradation of beam quality a "reduction of coherence" 27,28 . Actually this is not precise 29 , as the speckle-like field produced by a random deflection from a rough surface (or refraction from a rough window) is still capable of producing interference fringes in a Young experiment if the original wave was spatially coherent.…”

Section: Effects Of Quality Of Optical Elementsmentioning

confidence: 99%