So the tunnel the LHC is in has a circumference of 26.7 km. But the LHC has two parallel beam lines running in opposite directions. I assume that’s where the

So the tunnel the LHC is in has a circumference of 26.7 km. But the LHC has two parallel beam lines running in opposite directions. I assume that’s where the discrepancy between our numbers came from. But both beam lines are in the same vacuum vessel.