Improved mu-metal in 0L region
I used today's MD to improve mu-metal wraps in the 0L region between the booster and cryomodule. Mu-metal is there to reduce the earth's field by factor of 2-3 times over a long span where the beam energy is low. Still, bet if it's applied uniformly and concentrically with the beampipe. This is b/c the Earth's field doesn't disappear, it's just rerouted (div.B=0).
I doubt anyone will notice, but if a tiny bit of steering is required, this could be the reason.










