What question did this study set out to answer?

To describe the KLOE drift chamber's design and its effectiveness in tracking KL decays.

March 5, 2026Open Access

The KLOE Drift Chamber

Key Points

To describe the KLOE drift chamber's design and its effectiveness in tracking KL decays.
Constructed a cylinder-shaped drift chamber, ~2m radius and ~3.3m long.
Implemented a 15X0 em calorimeter for energy measurement.
Used a He-iC4H10 gas mixture and Al field wires to optimize performance.
Arranged alternating stereo wires for uniform cell filling.
Achieved point resolution in r, f better than 200mm.
Attained KL→p+p- vertex accuracy of sx,y(z)Š0.5(1-2)mm.
Obtained K0 mass resolution of sM~1MeV/c2.

Abstract

The KLOE drift chamber is a cylinder of ~2m radius and ~3.3m long, providing an adequate path for KL decays. The tracking volume is surrounded by a 15X0 em calorimeter and a superconducting coil providing a 0.6T field. Spherical end walls hold the tension of ~50000 wires, with good trasparency, Š0.1X0, to photons from p0 decays. Alternating stereo wires only, with constant radial displacement at the center, provide a uniform filling with approximately square cells. A He-iC4H10 gas mixture and Al field wires are used to minimize multiple scattering. The chamber point resolution in r, f is significantly better than 200mm resulting in a KL�p+p- vertex accuracy of sx,y(z)Š0.5(1-2)mm. The K0 mass resolution is sM~1MeV/c2.

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