High-Throughput Asymmetric Double-Crystal Monochromator of the SAXS Beamline at ELETTRA
書誌事項
- 公開日
- 1998-07-01
- 権利情報
-
- http://journals.iucr.org/services/copyrightpolicy.html
- http://journals.iucr.org/services/copyrightpolicy.html#TDM
- DOI
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- 10.1107/s0909049597019110
- 公開者
- International Union of Crystallography (IUCr)
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説明
<jats:p>A new high-flux wiggler beamline for fast time-resolved small-angle X-ray scattering (SAXS) based on double-focusing optics has recently commenced operation at the 2 GeV third-generation storage ring ELETTRA at Trieste, Italy. Its non-dispersive double-crystal monochromator contains three pairs of interchangeable asymmetrically cut flat Si(111)-crystal pairs, each of which is optimized for high throughput at one of the three fixed energies 5.4, 8 and 16 keV. To cope with the severe thermal power load produced by a 57-pole wiggler on the first crystal of each pair (up to 5.4 W mm<jats:sup>−2</jats:sup> and 700 W under normal incidence, for 400 mA), grazing angles of 2° and optimized back-cooling have been chosen. This solution allows simultaneously a gain of 2.5–3.0 in throughput and, accordingly, in flux density. Finite-element analysis as well as commissioning tests showed that the cooling layout functions very satisfactorily, and that up to 5 × 10<jats:sup>12</jats:sup> photons s<jats:sup>−1</jats:sup> are available at the sample (at 8 keV and 250 mA), as predicted.</jats:p>
収録刊行物
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- Journal of Synchrotron Radiation
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Journal of Synchrotron Radiation 5 (4), 1215-1221, 1998-07-01
International Union of Crystallography (IUCr)
