A dedicated small-angle X-ray scattering beamline with a superconducting wiggler source at the NSRRC

A dedicated small-angle X-ray scattering beamline with a superconducting wiggler source at the NSRRC

At the National Synchrotron Radiation Research Center (NSRRC), which operates a 1.5 GeV storage ring, a dedicated small-angle X-ray scattering (SAXS) beamline has been installed with an in-achromat superconducting wiggler insertion device of peak magnetic field 3.1 T. The vertical beam divergence fr...

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Veröffentlicht in:Journal of synchrotron radiation. - 1994. - 16(2009), Pt 1 vom: 13. Jan., Seite 97-104
1. Verfasser: Liu, Din Goa (VerfasserIn)
Weitere Verfasser: Chang, Chien Hung, Liu, Chin Yen, Chang, Shih Hung, Juang, Jwei Ming, Song, Yen Fang, Yu, Kuan Li, Liao, Kuei Fen, Hwang, Ching Shiang, Fung, Hok Sum, Tseng, Ping Chung, Huang, Chi Yi, Huang, Liang Jen, Chung, Shih Chun, Tang, Mau Tsu, Tsang, King Long, Huang, Yu Shan, Kuan, Chien Kuang, Liu, Yi Chih, Liang, Keng S, Jeng, U Ser
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2009
Zugriff auf das übergeordnete Werk:Journal of synchrotron radiation
Schlagworte:Journal Article
Beschreibung
Zusammenfassung:At the National Synchrotron Radiation Research Center (NSRRC), which operates a 1.5 GeV storage ring, a dedicated small-angle X-ray scattering (SAXS) beamline has been installed with an in-achromat superconducting wiggler insertion device of peak magnetic field 3.1 T. The vertical beam divergence from the X-ray source is reduced significantly by a collimating mirror. Subsequently the beam is selectively monochromated by a double Si(111) crystal monochromator with high energy resolution (DeltaE/E approximately 2 x 10(-4)) in the energy range 5-23 keV, or by a double Mo/B4C multilayer monochromator for 10-30 times higher flux ( approximately 10(11) photons s(-1)) in the 6-15 keV range. These two monochromators are incorporated into one rotating cradle for fast exchange. The monochromated beam is focused by a toroidal mirror with 1:1 focusing for a small beam divergence and a beam size of approximately 0.9 mm x 0.3 mm (horizontal x vertical) at the focus point located 26.5 m from the radiation source. A plane mirror installed after the toroidal mirror is selectively used to deflect the beam downwards for grazing-incidence SAXS (GISAXS) from liquid surfaces. Two online beam-position monitors separated by 8 m provide an efficient feedback control for an overall beam-position stability in the 10 microm range. The beam features measured, including the flux density, energy resolution, size and divergence, are consistent with those calculated using the ray-tracing program SHADOW. With the deflectable beam of relatively high energy resolution and high flux, the new beamline meets the requirements for a wide range of SAXS applications, including anomalous SAXS for multiphase nanoparticles (e.g. semiconductor core-shell quantum dots) and GISAXS from liquid surfaces
Beschreibung:Date Completed 25.02.2009
Date Revised 19.12.2008
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1600-5775
DOI:10.1107/S0909049508034134