The time-of-flight detector of the DIRAC experiment

B Adeva,M.V Gallas,F Gómez,A López-Agüera,T Núñez-Pardo,M Pló,A.M Rodrı́guez,X.M Rodrı́guez,J.J Saborido,C Santamarina,M.J Tobar,P Vázquez

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2002）

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Abstract

The construction and performance of a large area time-of-flight detector for the DIRAC experiment at CERN is reported. With an average time resolution of 123ps per counter at rates up to 1MHz, it allows excellent separation of pπ− from π+π− pairs up to 4.6GeV/c momentum, as well as of Coulomb-correlated pion pairs from accidentals. The optimization of scintillator material, photomultiplier performance and readout electronics is described.

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29.40.Mc,85.60.Ha,29.90.Tr

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