Exploiting the potential of beam-compressing channel-cut monochromators for laboratory high-resolution small-angle X-ray scattering experiments

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00110922" target="_blank" >RIV/00216224:14310/19:00110922 - isvavai.cz</a>

Result on the web

<a href="http://scripts.iucr.org/cgi-bin/paper?vh5094" target="_blank" >http://scripts.iucr.org/cgi-bin/paper?vh5094</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1107/S1600576719003674" target="_blank" >10.1107/S1600576719003674</a>

Result language

angličtina

Original language name

Exploiting the potential of beam-compressing channel-cut monochromators for laboratory high-resolution small-angle X-ray scattering experiments

Original language description

A systematic study of beam-compressing monolithic channel-cut monochromators (CCMs) with a V-shaped channel was performed. The CCMs were optimized in terms of a chosen output beam parameter for exploitation in laboratory high-resolution small-angle X-ray scattering (SAXS) and grazing-incidence SAXS (GISAXS) experiments. Ray-tracing simulations provided maps of particular Ge(220) CCM output beam parameters over the complete set of asymmetry angles of the two CCM diffractions. This allowed the design and fabrication of two dedicated CCMs, one optimized for maximum photon flux per detector pixel and the other for K-2 suppression. The output beam quality was tested in SAXS/GISAXS experiments on a commercial setup with a liquid-metal-jet Ga microfocus X-ray source connected to 2D collimating Montel optics. The performance of the CCM optimized for maximum photon flux per detector pixel was limited by the quality of the inner channel walls owing to a strongly asymmetric design. However, the CCM optimized for K-2 suppression exhibited an excellent resolution of 314nm in real space. This was further enhanced up to 524nm by a parallel Ge(220) CCM in the dispersive configuration at a still applicable output flux of 3x10(6)photons(-1). The 314nm resolution outperforms by more than 2.5x the upper resolution limit of the same setup with a pinhole collimator instead of the CCM. Comparative SAXS measurements on the same setup with a Kratky block collimator as an alternative to the CCM showed that the CCM provided more than one order higher transmittance at a comparable resolution or twice higher resolution at a comparable transmittance. These results qualify CCMs for a new type of integrated reflective-diffractive optics consisting of Gobel mirrors and V-shaped CCMs for the next generation of high-performance microfocus laboratory X-ray sources.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Applied Crystallography

ISSN

0021-8898

e-ISSN

1600-5767

Volume of the periodical

52

Issue of the periodical within the volume

JUN 2019

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

498-506

UT code for WoS article

000470824800002

EID of the result in the Scopus database

2-s2.0-85064692480