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- W3133849989 abstract "The experiment HERA - B is currently under construction at the Deutscnes Elektronen Synchrotron DESY in Hamburg and, upon completion, will investigate CP-violation in decays of B-mesons. The central challenges for this experiment are a high density of particle tracks in the detector (about 200 tracks per event) and an extremely small signal-to-background-ratio ($10^{-11}$ for the decay channel $B to J/psi K^0_s to l^+l^-pi^+pi^-$). Data from 540,000 channels must be processed an event rate of 10 MHz and a first level trigger rate of 50 kHz without dead time. A novel fast control system has been developed to dislribute time references, trigger information and test signals to the front end electronics of all detector components as well as for some first level trigger control functions. This thesis starts with an introduction to the experiment and a detailed description of the data acquisition system which leads to the requirements for the fast control system. The motivation is followed by a description of the fast control hard- and software. The time references and trigger signals, which are distributed by the system, are characterized. Successful synchronization of the detector components is shown by means of data from the 1998 HERA - B -operation. Finally some possibilities the system provides for investigating the first level trigger and potential biases the fast control system might give to HERA - B measurements are discussed." @default.
- W3133849989 created "2021-03-15" @default.
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- W3133849989 date "1999-06-16" @default.
- W3133849989 modified "2023-09-24" @default.
- W3133849989 title "Design, Implementation and Characterization of the Fast Control System for the HERA-B Experiment" @default.
- W3133849989 hasPublicationYear "1999" @default.
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