Mexiko Apr - Jul 2021 at U Heidelberg Marialuisa Aliotta, University of Edinburgh, UK Sep 2020 - Jul 2021 at U Frankfurt and GSI Martino Trassinelli, SNRS and Sorbonne University Mar - Apr 2021 at GSI Gerd [...] Sinyukov, BITP Kiev, Ukraine Apr 25 - Aug 26, 2022, at GSI 2021 György Wolf, Wigner Research Center for Physics Budapest, Hungary 6 months within 2021 and 2022 at U Frankfurt Axel Weber, Institute for Physics [...] and 2022 at GSI György Wolf, Wigner Research Center for Physics Budapest, Hungary 6 months within 2021 and 2022 at U Frankfurt Davide Proment, School of Mathematics, University of East Anglia, U.K. 6 weeks