7 research outputs found

    ATLAS detector and physics performance: Technical Design Report, 1

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    The tagging detector of the CP-violation experiment NA48 at CERN

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    The CP-violation experiment NA48 at CERN aims at measuring direct CP-violation in the decays of neutral kaons into #### and ####. The experiment uses simultaneous, almost collinear beams of neutral K# # and K# # mesons, which are produced on two di#erent targets. K# # events are "tagged" by measuring the times of the protons that fly towards the K# # production target. In order to sustain the high rate of 10# protons/s in this beam without su#ering from too many pile-up events, the detector consists of 24 separate scintillators (12 horizontal and 12 vertical), each of which sees only a small fraction of the beam. Their signals are digitized by specially developed 1 GHz FADCs. The exact time of a pulse is established o#ine by a fit procedure. The detector and its electronics have been successfully used during test beams in 1994---1996 and during the first physics run of NA48 in 1997. The ine#ciency of the detector has been measured to 2#10##. Sources of background have been identified to allow for o#-line correction. The mechanical setup of the detector, the 1 GHzFADC and results from the test and data runs are presented. # 1998 Elsevier Science B.V. All rights reserved. 1

    ATLAS detector and physics performance: Technical Design Report, 2

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    The beam and detector for the NA48 neutral kaon CP violation experiment at CERN

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