Drift chambers with delay line readout operated in the limited streamer mode

Abstract

This report presents the performance of drift chambers operated in the limited streamer mode with 9.4 cm maximum drift distance and position sensing along the 4.35 m long anode wire through delay line timing. Using only three timing channels a position resolution of 1×3 mm 2 is obtained over a detector surface of 19×435 cm 2. In this contribution, the emphasis is mainly put on the performance of the delay line and on the drift behaviour in streamer mode using safe gas mixtures.