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The 1 m long and 1 m outer diameter KEDR drift chamber consists of 42 layers. The chamber is based on a jet type cell. In addition to drift time measurements, pulse height measurements will provide particle separation by d E dx . The measurements of the spatial resolution and the effects of the end plates on resolution and aging tests were performed using prototypes filled with DME gas. The resolution averaged over the drift distance has a value of 40 μm. The relative gain drop is equal to 45 %/(C/cm).

The design features of the KEDR drift chamber are described. The 1 m long and 1 m outer diameter cylindrical chamber consists of seven radial super layers. The multiwire drift cell contains six sense wires with a distance of 4.5 mm. The maximum drift distance is 30 mm. Measurements of spatial resolution and aging tests were performed using DME gas with a prototype. The resolution averaged over drift distance has a value of 40 μm. The relative gain drop is equal to 45%/(C/cm). This would correspond to 2% pulse height decrease per year at a gas gain of 105 and flux of the charged particles of 1 kHz/cm2.

The 1 m long and 1 m outer diameter chamber consists of 42 layers. The chamber is based on a cell of the jet type with drift distance of 30 mm. The measurements of the spatial resolution and the aging tests were performed with DME gas on prototypes. The resolution averaged over the drift distance has a value of 45 μ m. The relative gain drop is equal to 45%/(C/cm). The design and construction of the chamber, the gas system, the laser calibration system and first results of the cosmic-ray test are discussed.