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Most applications of x-ray multilayers at modern synchrotron sources require a precise control of the d-spacing over
large areas. The grazing incidence geometry causes a long beam footprint. Curved multilayer optics may need steep
thickness gradients in order to reflect the full beam at constant photon energy. The tolerable thickness error is far below
the intrinsic energy resolution of the multilayer Bragg peak, which is of the order of 1% or less.
The recently commissioned ESRF multilayer deposition system can coat surfaces of up to 1000mm long and 150mm
wide with a precise thickness distribution. The local particle flux is controlled by both linear motion of the substrates and
masking of the particle sources. The thickness profiles are estimated using a numerical model. Corrections can be
applied to suppress minor errors.
Recent results illustrate both the potential and the limitations of the available deposition technology. A description of
present and future applications at 3rd generation synchrotron sources complements this work.
Ch. Morawe andJ.-Ch. Peffen
"Thickness control of large area x-ray multilayers", Proc. SPIE 7448, Advances in X-Ray/EUV Optics and Components IV, 74480H (8 September 2009); https://doi.org/10.1117/12.826121
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Ch. Morawe, J.-Ch. Peffen, "Thickness control of large area x-ray multilayers," Proc. SPIE 7448, Advances in X-Ray/EUV Optics and Components IV, 74480H (8 September 2009); https://doi.org/10.1117/12.826121