I am trying to do a s-parameter simulation of a coax cable in a cryogenic system. I want to model two ends of cable at room temperature but middle of the cable being at a cryo temperature. Is it possible to do this ? Also i am really new to this thermal simulations in CST Studio Suite  . I am just confused on the right methods of setting up the simulations. I could not find a proper documentation for this EM-thermal coupling. Can someone direct me to some documentation or videos?