3-sep-2010 CERN Massimiliano Ferro-Luzzi

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IR8 crossing , view from top, an exampleIR8 crossing , view from top, an example

inside of LHC

outside of LHC

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trom

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bum

p

fixedext /2 = -100 urad

int /2 = -270 urad

net /2 = (-270-100) urad = -370 uradBspect points downPC = positiveSometimes called the “good” polarity

Bspect points downPC = positiveSometimes called the “good” polarity

int /2 = +270 urad

net /2 = (270-100) urad = +170 urad

Bspect points upPC = negativeSometimes called the “bad” polarity

Bspect points upPC = negativeSometimes called the “bad” polarity

beam1beam1

LHCb Bspect