From IEEE Spectrum, Jan. 30, 2019: If realized, the Future Circular Collider will produce magnetic fields nearly twice as strong as the LHC and accelerate particles to unprecedented energies of 100 teraelectron volts, compared to the Large Hadron Collider’s energies of 13 TeV. Whereas the magnetic system at the LHC can achieve strengths of 8.3 teslas, the FCC system would be able to achieve 16 T.
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.