High-throughput asymmetric double-crystal monochromator of the SAXS beamline at ELETTRA
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 i...
| Veröffentlicht in: | Journal of synchrotron radiation. - 1994. - 5(1998), Pt 4 vom: 01. Juli, Seite 1215-21 |
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| Weitere Verfasser: | , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
1998
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| Zugriff auf das übergeordnete Werk: | Journal of synchrotron radiation |
| Schlagworte: | Journal Article |
| Zusammenfassung: | 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(-2) and 700 W under normal incidence, for 400 mA), grazing angles of 2 degrees 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 x 10(12) photons s(-1) are available at the sample (at 8 keV and 250 mA), as predicted |
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| Beschreibung: | Date Completed 24.04.2008 Date Revised 11.05.2006 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 0909-0495 |