The Paul Scherrer Institute (PSI) in Villingen, near Zurich, is responsible for
the mechanical/thermal structure of the RGS Focal Camera (RFC),
including the cooling system in the form of a passive radiator.
The Engineering-Qualification Model of the RFC and the passive radiator are shown below (courtesy of PSI and Oerlikon-Contraves).
For further pictures and information on the PSI involvement in
Paul Scherrer Institute XMM-Newton page