On the feasibility of employing gradient crystals for high resolution synchrotron optics
On the feasibility of employing gradient crystals for high resolution synchrotron optics
复制标题
梯度晶体用于高分辨率同步加速器光学的可行性
DOI：
10.1016/0168-9002(96)00199-4
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发表时间：
1996
影响因子：
1.4
通讯作者：
W. Schröder
中科院分区：
文献类型：
--
作者：
A. Erko;F. Schäfers;W. Gudat;N.V Abrosimov;S. Rossolenko;V. Alex;S. Groth;W. Schröder
我们提出了一种用于x射线区域同步辐射应用的新型光学元件的第一个实验数据：即基于Si1−xx合金的横向梯度非周期晶体。在Si1−xgx晶体中含有最多一定量原子%的梯度晶体，其晶格参数沿衍射平面呈近似线性变化。因此，发散入射光在晶体上的布拉格角的变化可以得到补偿。这开辟了在全垂直发散下，在2 keV以上的整个能量范围内，在几乎晶体有限分辨率下操作晶体单色仪而无需准直前镜的可能性。同时，与传统的硅晶单色器相比，反射光谱强度可以大大增加。
We present first experimental data on a novel type of optical element for synchrotron radiation applications in the X-ray region: namely laterally-graded aperiodic crystals on the basis of Si1−xGexalloys. The lattice parameter of such gradient crystals containing up to some atomic % in Si1−xGxcrystal changes nearly linearly along the plane of diffraction. Thus the variation of the Bragg angle of divergent incident light on the crystal can be compensated for. This opens up the possibility to operate a crystal monochromator in nearly crystal limited resolution in the whole energy range above 2 keV at the full vertical divergence without a collimating premirror. Simultaneously the reflected spectral intensity can be increased considerably as compared with a conventional Si-crystal monochromator.