Author/Authors :
Llope، نويسنده , , W.J. and Zhou، نويسنده , , J. and Nussbaum، نويسنده , , T. and Hoffmann، نويسنده , , G.W. and Asselta، نويسنده , , K. and Brandenburg، نويسنده , , J.D. and Butterworth، نويسنده , , J. and Camarda، نويسنده , , T. and Christie، نويسنده , , W. and Crawford، نويسنده , , H.J. and Dong، نويسنده , , X. and Engelage، نويسنده , , Mitchell J. and Eppley، نويسنده , , G. and Geurts، نويسنده , , F. and Hammond، نويسنده , , J. and Judd، نويسنده , , E. and McDonald، نويسنده , , D.L. and Perkins، نويسنده , , C. and Ruan، نويسنده , , L. and Scheblein، نويسنده , , J. and Schambach، نويسنده , , J.J. and Soja، نويسنده , , R. and Xin، نويسنده , , K. and Yang، نويسنده , , C.، نويسنده ,
Abstract :
The 2×3 channel pseudo Vertex Position Detector (pVPD) in the STAR experiment at RHIC has been upgraded to a 2×19 channel detector in the same acceptance, called the Vertex Position Detector (VPD). This detector is fully integrated into the STAR trigger system and provides the primary input to the minimum-bias trigger in Au+Au collisions. The information from the detector is used both in the STAR Level-0 trigger and offline to measure the location of the primary collision vertex along the beam pipe and the event “start time” needed by other fast-timing detectors in STAR. The offline timing resolution of single detector channels in full-energy Au+Au collisions is ~100 ps, resulting in a start time resolution of a few tens of picoseconds and a resolution on the primary vertex location of ~1 cm.
Keywords :
Vertex Position Detector , STAR experiment , RHIC , Fast timing , Time resolution
