Solmeyer Neal, Zhu Kunyan, Weiss David S
104 Davey Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Rev Sci Instrum. 2011 Jun;82(6):066105. doi: 10.1063/1.3606437.
We have developed a way to mount ultra-high vacuum windows onto standard ConFlat(®) vacuum systems with very low stress-induced birefringence. Each window is sealed to a stainless steel flange with a compressed indium wire, and that flange is connected to a vacuum chamber with another indium seal. We find that deformation of a standard ConFlat flange during indium sealing dominates the stress on the window, so an extra-rigid flange is needed for minimal birefringence. With this mounting scheme, the typical residual birefringence is Δn = 2.3 × 10(-7) and is unchanged by a 120 °C bake.
我们已经开发出一种方法，能够将超高真空窗口安装到标准的ConFlat（®）真空系统上，且应力诱导双折射极低。每个窗口都通过一根压缩铟丝密封到一个不锈钢法兰上，而该法兰又通过另一个铟密封连接到真空腔室。我们发现，铟密封过程中标准ConFlat法兰的变形主导了窗口上的应力，因此需要一个超刚性法兰以实现最小双折射。采用这种安装方案，典型的残余双折射为Δn = 2.3×10⁻⁷，并且在120°C烘烤后保持不变。
