Groeten @djoerd, do you mean: a server for researchers in information retrieval? Or for researcher's information retrieval? (The about page makes a real effort not to reveal much.)
We maintain a list of fediverse servers in the real of research and would like to add this one with the right description. https://fediscience.org/server-list.html
Will add that the server is invitation only if that is the default state for a longer time.