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Would this be a different loop, but connected to LHC or is this a new standalone loop where they would need to find a locale to build it underground?

Completely new tunnel, but it will be connected to LHC, as they will use LHC to pre accelerate the particles.

Almost all accelerators built at CERN are still active and are a chain of pre-accelerator for LHC now:

wow. Amazing map. Just imagine Half Life map with it... :)

That seems like insane engineering

This will be a completely new tunnel loop. The LHC tunnel will be used by LHC at the same time the new tunnel loop is being constructed.

Thanks for clarifying, much appreciated.