Abstract
The KLOE drift chamber is a cylinder of ∼2 m radius and ∼3.3 m long, providing an adequate path for K L decays. The tracking volume is surrounded by a 15 X 0 em calorimeter and a superconducting coil providing a 0.6T field. Spherical end walls hold the tension of ∼50000 wires, with good transparency, ≤0.1 X 0, to photons from π 0 decays. Alternating stereo wires only, with constant radial displacement at the center, provide a uniform filling with approximately square cells. A HeiC 4H 10 gas mixture and Al field wires are used to minimize multiple scattering. The chamber point resolution in r, φ is significantly better than 200 μm resulting in a K L → π + π − vertex accuracy of σ x, y( z) ≤ 0.5(1–2) mm. The K 0 mass resolution is σ M ∼ 1 MeV/ c 2.
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