THE KLOE DRIFT CHAMBER

The KLOE drift chamber is a cylinder of similar to 2 m radius and simi lar to 3.3 m long, providing an adequate path for K-L decays. The trac king volume is surrounded by a 15 X(o) em calorimeter and a supercondu cting coil providing a 0.6 T field. Spherical end walls hold the tensi on of similar to 50 000 wires, with good transparency, less than or eq ual to 0.1 X(o), to photons from pi(o) decays. Alternating stereo wire s only, with constant radial displacement at the center, provide a uni form filling with approximately square cells. A He-iC(4)H(10) gas mixt ure and Al field wires are used to minimize multiple scattering. The c hamber point resolution in r, phi is significantly better than 200 mu m resulting in a K-L --> pi(+) pi(-) vertex accuracy of sigma(x,y(z)) less than or equal to 0.5(1-2)mm. The K-o mass resolution is sigma(M) similar to 1 MeV/c(2).