双晶单色器水冷晶体的设计加工

简要介绍了弧矢聚焦双晶单色器的作用及结构原理，根据设计指标确定了水冷晶体衍射面及外形尺寸，分析了高热负载下水冷晶体的热变形，根据国外经验采用直接水冷却法进行高热负载的热缓释，设计了用于直接水冷却的刻槽晶体及冷却结构，根据设计完成了晶体的材料选择、定向切割、冷却水槽的刻制等加工工艺，最终完成了适用于弧矢聚焦双晶单色器的直接水冷分光晶体的加工，该晶体能承受大于0．5W/mm^2的热负载。

Design and fabrication of diffraction crystal for double-crystal monochromator

Firstly the role and structure of the sagittally focusing double-crystal monochromator are introduced briefly. Dimensions of the diffraction crystal are determined according to the design requirement. Different kinds of distortions of the diffraction crystal subject to high heat load from synchrotron radiation beam are analyzed. Direct water-cooling is adopted to release the high heat load. The grooved crystal and the cooling structure are designed. Then material choice, orientating and cutting, and grooving of the diffraction crystal are completed in succession. At last the directly water-cooled diffraction crystal applicable for the sagittally focusing double-crystal monochromator is produced which can bear heat load stand of more than 0.5W/mm2.