Surface Roughness of Stainless Steel Bender Mirrors for FocusingSoft X-rays

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We have used polished stainless steel as a mirror substrate to provide focusing of soft x-rays in grazing incidence reflection. The substrate is bent to an elliptical shape with large curvature and high stresses in the substrate require a strong elastic material. Conventional material choices of silicon or of glass will not withstand the stress required. The use of steel allows the substrates to be polished and installed flat, using screws in tapped holes. The ultra-high-vacuum bender mechanism is motorized and computer controlled. These mirrors are used to deliver focused beams of soft x-rays onto the surface of a sample ... continued below

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Yashchuk, Valeriy V.; Gullikson, Eric M.; Howells, Malcolm R.; Irick, Steve C.; MacDowell, Alastair A.; McKinney, Wayne R. et al. October 11, 2005.

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We have used polished stainless steel as a mirror substrate to provide focusing of soft x-rays in grazing incidence reflection. The substrate is bent to an elliptical shape with large curvature and high stresses in the substrate require a strong elastic material. Conventional material choices of silicon or of glass will not withstand the stress required. The use of steel allows the substrates to be polished and installed flat, using screws in tapped holes. The ultra-high-vacuum bender mechanism is motorized and computer controlled. These mirrors are used to deliver focused beams of soft x-rays onto the surface of a sample for experiments at the Advanced Light Source (ALS). They provide an illumination field that can be as small as the mirror demagnification allows, for localized study, and can be enlarged, under computer control,for survey measurements over areas of the surface up to several millimeters. The critical issue of the quality of the steel surface, polished and coated with gold, which limits the minimum achievable focused spot size is discussed in detail. Comparison is made to a polished, gold coated, electroless nickel surface, which provides a smoother finish. Surface measurements are presented as power spectral densities, as a function of spatial frequency. The surface height distributions measured with an interferometric microscope, and complemented by atomic force microscope measurements, are used to compute power spectral densities and then to evaluate the surface roughness. The effects of roughness in reducing the specular reflectivity are verified by soft x-ray measurements.

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  • Journal Name: Applied Optics; Journal Volume: 45; Journal Issue: 20; Related Information: Journal Publication Date: 07/10/2006

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  • Report No.: LBNL--59024
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 888771
  • Archival Resource Key: ark:/67531/metadc873186

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 11, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:33 p.m.

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Yashchuk, Valeriy V.; Gullikson, Eric M.; Howells, Malcolm R.; Irick, Steve C.; MacDowell, Alastair A.; McKinney, Wayne R. et al. Surface Roughness of Stainless Steel Bender Mirrors for FocusingSoft X-rays, article, October 11, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc873186/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.