Abstract
We have developed a scintillation counter hodoscope to measure the vertical position of a high energy charged particle with associated identity information. It may be used to tag beam tracks seen in detectors with poorer time resolution, such as bubble or spark chambers. The hodoscope consists of six overlapping planes of plastic scintillator strips 1 16 in. thick, 3 in. wide, and varying height and vertical spacing. The vertical resolution is 3 32 in. over a 6 in. height. Each plane is connected to a single photomultiplier tube. The output from the six tubes forms the Gray code + of the vertical position of a track passing perpendicularly through the planes. This and three bits of tagging information form a nine bit word associated with each track. Up to 16 such words are stored in an ECL buffer capable of accepting a new track every 20 ns. The buffer is interfaced to a DGC Supernova computer through CAMAC. The construction and performance of the device are discussed.
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