NOBUGS 2004 Conference

New Opportunities for Better User Group Software

October, 18-20, 2004 at PSI, Switzerland

Abstract Submitted for NOBUGS2004

WWW-accessed data analysis with X-ray Server

S. Stepanov

X-ray Server is a public project operational at the APS since 1997 with the goals to explore novel network technologies for providing wide scientific community with access to personal research results, establishing scientific collaborations, and refining scientific software. The Server provides Web-based access to a number of data analysis programs developed by the author in the field of X-ray diffraction and scattering. The software operates directly on the Server available for use without downloading. Currently seven programs are accessible that have been used more than 90,000 times. They provide: 1. Interpolating of dispersion corrections df', df" from discrete data sets in the x-ray range with the help of an original algorithm. 2. Finding Bragg planes in crystals under various conditions. 3. Calculating x-ray Bragg diffraction curves from strained crystals and multilayers for any Bragg-case geometry with scans around arbitrary axes and with account for specular reflection effects at grazing incidence. 4. Calculating x-ray specular reflection from multilayers with interface roughness and transition layers with the help of new recursive algorithm converging faster than the recursion by Parratt. 5. Calculating x-ray resonant specular reflection from magnetic multilayers with chemical and magnetic interface roughness and transition layers. 6. Calculating x-ray diffuse scattering from correlated interface roughness in multilayers with a number of different roughness models. 7. Calculating multiple Bragg diffraction of x-rays by crystals with the help of novel algorithm applicable to grazing incidence and/or exit. The report discusses the Server philosophy, provides an overview of the physical models and algorithms beneath the codes and demonstrates some applications of the programs. It is shown with examples and statistics how the Server goals are achieved. The plans for further X-ray Server development are outlined.

Abstract File: abstract00120.txt


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