Speaker
Description
To further reduce thermal noise in future detectors, and depending on progress in the development of improved coating materials, it will be important to adapt the optical design of the Fabry–Perot arm cavities to optimize the beam size. However, in current gravitational-wave detectors, the geometry of the central interferometer is constrained by the available space and stability requirements. For the design of future detectors, it is therefore interesting to explore the allowed geometries of the Fabry–Perot arm cavities while keeping the beam size at the input test masses constant. In this poster, we present a method to evaluate the criticality of the optical design of the arm cavities in terms of alignment and sensitivity to thermal effects, while keeping the impact on the central interferometer minimal.