The computational investigation of perfect and bent crystals both cylindrically and sagittaly, have led to the development of sets of optimized parameters to be used for the high energy wiggler beamline monochromator being built at the CLS. Using both Si and Ge in Bragg and Laue geometries, the developed algorithms examine parameter space for most photon flux at the crystal. Using programs in XOP, the calculation analysis for a single incident beam revealed that for symmetric flat crystals the reflection (1,1,1) in the Bragg geometry is most preferable for producing the most throughput at energies below 24keV. For cylindrically bent crystals at energies higher than 24keV, a Laue geometry is more preferred as a result of an increase in the rocking curve width and throughput. Development of a program that calculates the diffracted intensity and energy resolution of a saddle bent crystal with varying asymmetry angles are presented here.

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Dans cette thèse, nous avons étudié plusieurs combinaisons de matériaux et quelques méthodes d’ingénierie des interfaces : introduction de barrières de Zr dans les multicouches Co/Mg ; pulvérisation réactive des multicouches Co/Ti ; incorporation de B et C dans les multicouches Cr/Ti and remplacement de Mo par Mo2C dans le système Mo/B4C. Les propriétés des interfaces enterrées ont pu être étudiées en combinant XRR, XPS, TEM, etc. De plus, un modèle pour analyser les empilements a été développé en se basant sur la fluorescence X induite par ondes stationnaires. Pour les multicouches à base de Co, nous avons effectué des mesures RMN pour comprendre le comportement des atomes de cobalt dans les empilements. Ces méthodes se révèle des outils puissants pour analyser les multicouches sans dommages. / In this thesis, we study several material combinations and some interface engineering methods...