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Deformation mechanism of the Cryostat in the CADS Injector II

机译：CADS注射器II中低温恒温器的变形机制II

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摘要

Thermal contraction and expansion of the Cryostat will affect its reliability and stability. To optimize and upgrade the Cryostat, we analyzed the heat transfer in a cryo-vacuum environment from the theoretical point first. The simulation of cryo-vacuum deformation based on a finite element method was implemented respectively. The completed measurement based on a Laser Tracker and a Micro Alignment Telescope was conducted to verify its correctness. The monitored deformations were consistent with the simulated ones. After the predictable deformations in vertical direction have been compensated, the superconducting solenoids and Half Wave Resonator cavities approached the ideal “zero” position under liquid helium conditions. These guaranteed the success of 25?MeV@170?uA continuous wave protons of Chinese accelerator driven subcritical system Injector II. By correlating the vacuum and cryo-deformation, we have demonstrated that the complete deformation was the superposition effect of the atmospheric pressure, gravity and thermal stress during both the process of cooling down and warming up. The results will benefit to an optimization for future Cryostat’s design.
机译：低温恒温器的热收缩和膨胀将影响其可靠性和稳定性。为了优化和升级低温恒温器，我们首先分析了远离理论点的冷冻真空环境中的传热。基于有限元法的冷冻真空变形模拟分别实施。进行了基于激光跟踪器和微校准望远镜的完成测量以验证其正确性。被监测的变形与模拟的变形一致。在已经补偿垂直方向上可预测变形之后，超导螺线管和半波谐振器腔在液氦条件下接近理想的“零”位置。这些保证了25架MEV @ 170的成功吗？UA中华加速器驱动亚临界系统注射器II的连续波形质子。通过与真空和冷冻变形相关，我们已经证明了完全变形是在冷却和预热过程中的气氛压力，重力和热应力的叠加效果。结果将有利于未来低温仪设计的优化。

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