Use of Entrance Hodoscope for Particle Identification in Very-High-Energy Blbble Chamber Experiments

At energies of 10 Bev and higher, it is not easy to obtain physically separated beams of π and k mesons. We have constructed a hodoscope system which will register the identity of each of 20 particles entering a bubble chamber over a 100 microsecond time interval. Particles are localized by a scintillator hodoscope with matrix elements 1 cm square. Particle identity is determined with Cerenkov counters. The combined information is displayed on an oscilloscope and photographed at each bubble chamber expansion.