大型低温重力波望遠鏡KAGRAのための圧搾真空源の開発、導入及び検証

从2022年4月起，Eisenmann博士参与了滤波腔（FC）光学损耗的表征和改进，以及将在未来运行中在KAGRA中实施的频率相关压缩设置的设计。为了满足KAGRA的要求，他进行了几次模拟以优化FC的反射镜特性，并在中间光学器件的设计中做出了重要贡献，这对于在FC中以及从FC到干涉仪的频率无关压缩注入至关重要。他也是蓝宝石衬底表征和新技术开发的关键成员，不仅这不仅可以更快、更准确地表征蓝宝石的双折射，还可以减轻KAGRA自动对准系统中这种双折射的影响。在新型表征系统的开发方面，他首先优化了现有的线性偏振仪，然后自主开发了基于液晶技术的新技术。通过这种设置，目前正在NAOJ进行测试，将在一天内对像KAGRA mirrros这样大的样品进行表征，与当前方法相比，不会损失任何精度。值得注意的是，当前的设置需要一周以上的时间来进行表征，未来当测试质量的大小增加时，这可能会成为一个问题。

From April 2022, Dr. Eisenmann participated to the characterization and improvement of the Filter Cavity (FC) optical losses and design of the frequency dependent squeezing setup to be implemented in KAGRA in future runs. He performed several simulations on to optimize the FC's mirror properties in order to fit the KAGRA's requirement and also contributed in a major way in the design of the intermediate optics that will be crucial for the injection of frequency independent squeezing in the FC and from the FC to the interferometer.He also was a key member for the characterization of sapphire substrates and in the development of novel techniques to not only perform faster and more accurate characterization of the birefringence of sapphire but also to mitigate the effect of such birefringence in the automatic alignment system of KAGRA. On the development of novel characterization system, he in the first place optimized the already existing linear polarimeter, and then autonomously developed a novel technique based on liquid crystal technology. With such setup, currently under testing at NAOJ, samples as large as KAGRA mirrros will be characterized within one day, without loosing any precision compared to the current method. It is to be noted that current setup requires more than one week to perform the characterization, and this could become a problem in the future when the size of the test masses will be increased.