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Surface profiling of X-ray mirrors for shaping focused beams

DOI: 10.1364/OE.23.001576 DOI Help

Authors: David Laundy (Diamond Light Source) , Lucia Alianelli (Diamond Light Source) , John Sutter (Diamond Light Source) , Gwyndaf Evans (Diamond Light Source) , Kawal Sawhney (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Optics Express , VOL 23

State: Published (Approved)
Published: January 2015

Open Access Open Access

Abstract: Grazing incidence mirrors are a standard optic for focusing Xrays. Active mirrors, whose surface profile can be finely adjusted, allow control of beam shape and size at the sample. However, progress towards their routine use for beam shaping has been hampered by the strong striations in reflected beams away from the focal plane. Re-entrant (partly concave and partly convex) surface modifications are proposed for shaping X-ray beams to a top-hat in the focal plane while reducing the striations caused by unavoidable polishing errors. A method for constructing such surfaces with continuous height and slope (but only piecewise continuous curvature) will be provided. Ray tracing and wave propagation calculations confirm its effectiveness. A mirror system is proposed allowing vertical beam sizes in the range 0.5 to 10 micrometers. A prototype will be fabricated and is expected to have applications on many synchrotron X-ray beamlines

Subject Areas: Technique Development, Engineering

Technical Areas: Optics