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The ATLAS beam conditions monitor (BCM) was developed as a stand-alone device allowing separation of LHC p-p collisions from background events induced on beam gas or by beam accidents. This separation can be achieved by timing coincidences between two detector rings placed symmetrically around the interaction point at z=plusmn184 cm and r=55 mm (eta~4.2). The expected LHC lifetime dose at this position...
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