Cerenkov counters

 

The detection of an electron-positron pair was defined in the DLS system as the measured coincidence of one pair member in each of the two spectrometer arms. The electron identification per arm was determined first of all from the responses registered from the two gas filled Cerenkov detector arrays. The front Cerenkov array (C1) consisted of three counter cells, segmented in the arm's x dimension. The rear bank of Cerenkov counters (C2) was constructed of twenty detector cells, divided into two rows of ten counters. Each charged particle's momentum was evaluated by reconstructing its trajectory on either side of the magnetic field supplied by the arm's dipole magnet. Both magnets provided a nearly uniform vertical (± y) fields of 1.5 kG in which the charge particle's trajectory was bent in relation to its momentum. <br><br>

 

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