Speaker
Description
Next-generation detectors plan to have circulating powers in the MW range. In particular, the high-frequency Einstein telescope (ET-HF) is expected to operate at 3 MW circulating power to enhance sensitivity at high frequencies. Meanwhile, current detectors are operating at optical powers far below the design values. Major challenges with high power operation come from thermal deformations and long thermal transients, increased optical losses and parametric instabilities.
ET-OPT, a 10 m Fabry–Perot cavity at UCLouvain, is being developed to investigate optical configurations at ET-HF–relevant power densities, targeting parametric instability control, coating thermal noise mitigation, and thermal transient characterization.
This work presents the optical design and simulation of ET-OPT with a focus on thermal deformations and thermal compensation schemes. A wavefront sensing scheme using the phase camera and possible thermal actuation degrees of freedom for ET-OPT will be discussed.