摘要
针对上海光源U27波荡器光源,用ANSYS有限元软件对晶体单色器第一晶体液氮间接冷却进行数值模拟,给出晶体表面倾斜误差与热负载、冷却条件和布喇格角范围等因素的关系,为晶体单色器的设计与制造提供热缓释依据．晶体距光源中心24m时最大垂直入射功率密度约为60W／mm2,在布喇格角调节范围小于30°时,晶体厚度大于30mm,晶体吸收总功率上限可到240W,即可满足SSRF储存环电子束流升级到400mA的需求,采用正常液氮(78K)冷却晶体,晶体表面热变形倾斜误差可控制在3arcsec以下．
The simulation result of thermal distortion of DCM crystal indirectly cooled by liquid nitrogen（LN2） at Shanghai synchrotron radiation facility （SSRF） has been reported. The source is U27 undulator. The maximum of power density at 24m is 60W/mm^2. We give the correlation of the slope error of crystal surface vs. Bragg angle, the convection film coefficient, the bulk temperature of LN2 and total power absorbed by the first crystal, respectively. The slope error is less than 3 arcsec when the Bragg angle is less than 30°, the thickness of crystal is larger than 30mm, the current of storage ring is up to 400mA and cooled by 78K LN2.
出处
《高能物理与核物理》
EI
CSCD
北大核心
2006年第8期802-805,共4页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金(10205024)资助~~
关键词
晶体单色器
液氮冷却
有限元分析
double crystal monochromator（DCM）, cooled by liquid nitrogen, finite element analysis
