Large-square coordinate detector based on streamer tubes

The KMD-2 and KEDR muon detector system for experiments at VEPP storage rings is described. The KMD-2 muon system includes two layers of streamer tubes separated by the magnet yoke iron. Each layer consists of 8 octant-units. The tubes inside the unit are seriesly connected into batches of 4 for inner units (tube diameter is 20 mm) and into batches of 8 for outer units (tube diameter is 40 mm). The total tube number constitute 656, the chammel number being 128. The KEDR muon sytem for the VEPP-4 stirage ring will consist of 5 thousands of streamer tubes 40 mm in-dameter and 4-5 m long connected into batches of 4 tubes. Flowsheet of electronic channel is presented. One time channel permits to get 12x20 mm spatial resolution at detector square of 40x20000 mm. 3 refs.; 1 fig