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IR8 crossing , view from top, an example. beam1. outside of LHC. fixed ext /2 = -100 urad. inside of LHC. zoom on spectrometer bump. net /2 = (-270-100) urad = -370 urad. B spect points down PC = positive Sometimes called the “good” polarity. int /2 = -270 urad.
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IR8 crossing , viewfrom top, an example beam1 outside of LHC fixed ext /2 = -100 urad inside of LHC zoom on spectrometer bump net /2 = (-270-100) urad = -370 urad Bspect points down PC = positive Sometimes called the “good” polarity int /2 = -270 urad LHCb Bspect Bspect points up PC = negative Sometimes called the “bad” polarity int /2 = +270 urad net /2 = (270-100) urad = +170 urad