Author/Authors :
Sharabian، نويسنده , , Y.G. and Battaglieri، نويسنده , , M. and Burkert، نويسنده , , V.D. and DeVita، نويسنده , , R. and Elouadrhiri، نويسنده , , L. and Guo، نويسنده , , L. and Kashy، نويسنده , , D. and Kubarovsky، نويسنده , , V. and Mutchler، نويسنده , , G.S. and Ostrick، نويسنده , , M. and Ripani، نويسنده , , M. and Rossi، نويسنده , , P. and Rottura، نويسنده , , A. and Pasyuk، نويسنده , , E. and Weygand، نويسنده , , D.، نويسنده ,
Abstract :
The design, construction and performance of a highly segmented Start Counter are described. The Start Counter is an integral part of the trigger used in photon beam running with CLAS in Hall B at the Thomas Jefferson National Accelerator Facility (TJNAF). The Start Counter is constructed of 24 2.2-mm-thick single-ended scintillation paddles, forming a hermetic hexagon around the target region. This device measures the interaction time of the incoming photon in the target by detecting the outgoing particles. The counter provides complex trigger topologies, shows good efficiency and achieved a time resolution of 350 ps.
Keywords :
CLAS , Plastic scintillator , trigger , Time-of-flight
