Large tracking volume (K Long decay length= 340 cm)
Diameter = 4 m, Lenght = 3.3 m
High and uniform reconstruction efficiency
(due to the K Long decays distribution)
Uniform cells structure with spatial resolution
r-phi resolution = 0.2 mm and z resolution = 2 mm
Good momentum resolution @ 0.6 T (for
kinematical rejection of the background for CP events)
Relative momentum resolution = 0.5%
Transparency to reduce regeneration, multiple scattering
and conversion of low energy photons
Light mechanical structure: C-fiber composite
Light drift medium: 90%He-10%iC4H10
80 µm Al(Ag) field wires, 25 µm W(Au) sense wires
Drift Chamber Page