Laundy David, Alianelli Lucia, Sutter John, Evans Gwyndaf, Sawhney Kawal
Opt Express. 2015 Jan 26;23(2):1576-84. doi: 10.1364/OE.23.001576.
Grazing incidence mirrors are a standard optic for focusing X-rays. 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 10μm. A prototype will be fabricated and is expected to have applications on many synchrotron X-ray beamlines.
掠入射镜是聚焦X射线的标准光学元件。有源镜的表面轮廓可以精细调节，能够控制样品处光束的形状和尺寸。然而，由于远离焦平面的反射光束中存在强烈条纹，其在光束整形方面的常规应用进展受到阻碍。本文提出了凹面-凸面（部分凹面和部分凸面）表面修饰方法，用于在焦平面将X射线光束整形为平顶光束，同时减少由不可避免的抛光误差引起的条纹。将提供一种构建具有连续高度和斜率（但仅是分段连续曲率）此类表面的方法。光线追踪和波传播计算证实了其有效性。提出了一种镜系统，可使垂直光束尺寸在0.5至10μm范围内。将制造一个原型，预计其将应用于许多同步加速器X射线光束线。
