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ISSN - 01689002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992, vol. 323, p. 178-183

Z-chamber and the trigger of the CMD-2 detector

Anashkin E. V., Aulchenko V. M., Federenko V. E., Fedotovich G. V., Khazin B. I., Maximov A. V., Piskunov G. S., Snopkov I. G., Solodov E. P., Titov V. M., Zavarzin V. G., Yudin Yu V.

A double layer cylindrical MWPC (Z-chamber) is part of the CMD-2 detector. It serves both for precise measurements of track coordinates along the beam axis and for the first level trigger. The construction and performance of the Z-chamber are described. A fast gas mixture of 90% CF4 + 10% i-C4H10 was used to obtain a better time resolution. The measured time spread of the anode signals is σ = 4.1 ns. The first level trigger and a tracking processor are also discussed. © 1992.