This is one of the several conning towers that served as the feed-through for a corrector magnet in the Tevatron. The red silicone protected the electrical connections from corrosion, which could lead to electrical shorts. An ice ball was usually present around the whole tower when the magnet was in use.

Dipole magnets produce the dominant magnetic field that bends the particles traveling through the Main Ring. This particular dipole magnet sits skewed and bends both vertically and horizontally — deliberately so! — just ahead of the DZero collision hall.

From Silicon Republic, April 8, 2016: Researchers in the United States, including Fermilab researchers, and CERN have teamed up to produce 20 new accelerator magnets, which, when put together into the next LHC in 2026, will up its power by a factor of ten.