A Start-Timing Detector for the Collider Experiment PHENIX at RHIC-BNL
  We describe a start-timing detector for the PHENIX experiment at the relativistic heavy-ion collider RHIC. The role of the detector is to detect a nuclear collision, provide precise time information with an accuracy of 50ps, and determine the collision point along the beam direction with a resolution of a few cm. Technical challenges are that the detector must be operational in a wide particle-multiplicity range in a high radiation environment and a strong magnetic field. We present the performance of the prototype and discuss the final design of the detector. 
K. Ikematsu, Y. Iwata, K. Kaimi, M. Kaneta, T. Kohama, N. Maeda, K.   Matsukado, H. Ohnishi, K. Ono, A. Sakaguchi, T. Sugita...