HPC-Europa 3 aims to foster the transnational cooperation between scientists of EU countries (especially junior researchers) who deal with HPC-related topics such as applications, tools, and middleware. Therefore, grants for travelling and residing in one of the eight participating HPC centers will be offered on the application-basis. As one of the participating HPC centers, HLRS is planning to host up to 150 young scientists, providing them with access to HPC resources on its flagship supercomputer in a dimension of 4.2 million compute hours.