The picture shows a cavity resonator, on which the detectors planned by GravNet are based.

Links
- https://www.physik-astro.uni-bonn.de/en/news/uni-bonn-an-zwei-erc-synergy-grants-beteiligt/hochraumresonator.jpg/image_view_fullscreen
- https://www.physik-astro.uni-bonn.de/en/news/uni-bonn-an-zwei-erc-synergy-grants-beteiligt/hochraumresonator.jpg/@@download/image/Hochraumresonator.jpg