Zhang Qiuyuan, Polikarpov Maxim, Klimova Nataliya, Larsen Helge B, Mathiesen Ragnvald, Emerich Hermann, Thorkildsen Gunnar, Snigireva Irina, Snigirev Anatoly
Department of Mathematics and Physics, University of Stavanger, 4036 Stavanger, Norway.
European Molecular Biology Laboratory, Hamburg Unit, Building 25a, Notkestrasse 85, Hamburg, Germany.
J Synchrotron Radiat. 2019 Jan 1;26(Pt 1):109-118. doi: 10.1107/S1600577518014856.
Single-crystal diamond stands out among all the candidate materials that could be exploited to fabricate compound refractive lenses (CRLs) owing to its extremely stable properties. Among all related experimental features, beam divergence, χ-angles relative to the incoming beam in Eulerian geometry and different positions of the X-ray beam relative to the lens geometry may influence the transmission energy spectrum of CRLs. In addition, the orientation of the single-crystal diamond sample may also affect the glitches significantly. To verify these initial assumptions, two experiments, an energy scan and an ω-scan, were set up by employing a polished diamond plate consisting of five biconcave lenses. The results show that beam divergence does not affect the spectrum, nor do χ-angles when ω is set to zero. Nevertheless, different incident positions have an appreciable effect on the transmission spectrum, in particular the strengths' of the glitches. This is attributed to absorption. The ω-scan setup is capable of determining the so-called orientation matrix, which may be used to predict both energy positions' and `strengths' of the glitches.
在所有可用于制造复合折射透镜（CRL）的候选材料中，单晶金刚石因其极其稳定的特性而脱颖而出。在所有相关实验特征中，光束发散、在欧拉几何中相对于入射光束的χ角以及X射线光束相对于透镜几何的不同位置可能会影响CRL的传输能谱。此外，单晶金刚石样品的取向也可能对毛刺有显著影响。为了验证这些初步假设，通过使用由五个双凹透镜组成的抛光金刚石板进行了两个实验，即能量扫描和ω扫描。结果表明，当ω设置为零时，光束发散不影响光谱，χ角也不影响。然而，不同的入射位置对透射光谱有明显影响，特别是毛刺的“强度”。这归因于吸收。ω扫描装置能够确定所谓的取向矩阵，该矩阵可用于预测毛刺的“能量位置”和“强度”。
