Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic.
J Synchrotron Radiat. 2010 Jan;17(1):129-31. doi: 10.1107/S090904950904240X. Epub 2009 Nov 17.
The possibility of splitting a thin (e.g. undulator) X-ray beam based on diffraction-refraction effects is discussed. The beam is diffracted from a crystal whose diffracting surface has the shape of a roof with the ridge lying in the plane of diffraction. The crystal is cut asymmetrically. One half of the beam impinges on the left-hand part of the roof and the other half impinges on the right-hand side of the roof. Owing to refraction the left part of the beam is deviated to the left whereas the right part is deviated to the right. The device proposed consists of two channel-cut crystals with roof-like diffraction surfaces; the crystals are set in a dispersive position. The separation of the beams after splitting is calculated at a distance of 10 m from the crystals for various asymmetry and inclination angles. It is shown that such a splitting may be utilized for long beamlines. Advantages and disadvantages of this method are discussed.
基于衍射折射效应分裂薄（如波荡器）X 射线束的可能性进行了讨论。光束从晶体衍射，晶体的衍射面形状为屋脊，脊线位于衍射平面内。晶体是不对称切割的。一半的光束撞击屋脊的左侧，另一半撞击屋脊的右侧。由于折射，光束的左半部分向左偏离，而右半部分向右偏离。所提出的装置由两个具有屋脊状衍射面的通道切割晶体组成；晶体设置在色散位置。在晶体 10 米远处计算了不同非对称和倾斜角度下分裂后的光束分离。结果表明，这种分裂方法可用于长光束线。讨论了该方法的优缺点。
