These are the cryogenically cooled superconducting accelerator units used in the LCLS-II beam currently being upgraded at SLAC. Many people assume the big pipe is the core, but that's just the helium gas return line. The sealed pipe with the pink cover is the beam. These sections are built elsewhere and delivered for integration into the beamline. The helium comes in at 2K as a liquid and returns as a low pressure gas. The whole thing is in a vacuum, there's MLI around the inside of the pressure vessel followed my a medal shield and then the rest of the hardware is suspended inside minimizing the amount of support material that would conduct heat in from the surface.