低温恒温器变形的仿真与监测分析

SIMULATION MONITORING AND ANALYSIS FOR THE DEFORMATION OF CRYOMODULE

为保证加速器驱动嬗变研究装置的稳定运行,需要快速高精度安装低温恒温器并监测其低温位移和变形。从理论上分别计算了低温恒温器真空、低温变形,且进行了实测验证其正确性。通过有限元模拟计算玻璃纤维(G11)作为准直监测目标,有效控制监测目标自身的低温变形(≤0.1 mm)。采用双跟踪仪联机准直的新方法,使恒温器安装效率提高了70%。通过对恒温器降温循环中受力分析,表明其变形既包含真空又有低温变形,且和结构密切相关。这些措施有效地提高了准直安装效率和低温监测精度,保证了25 Me V连续质子束的成功引出,且有益于未来恒温器的优化设计和升级。

This paper presented the alignment and monitoring of cryomodule,calculated and verified the vacuum andcry- deformation and displacement firstly. As the heat conduction and expansion coefficient are both smaller,fiber glass（G11）was chosen as cry-monitoring target after the finite element simulation. And fiber glass（G11）can control its owncry-deformation within 0.1 mm. The novel solution adopted was collaborative alignment based on multi-laser tracker orportable coordinate measurement machine. The solution improved the installation efficiency by 70%,and doubled the installationprecision of existing cryomodule. As the deformation and displacement is beyond the telescope range（±1.2 mm）,the dial indicator was used to reduce the uncertainty error to 0.01 mm. The above results greatly improve the efficiency ofinstallation and the accuracy of monitoring in low temperature,guarantee the success of 25 MeV CW proton beam.