BELLE

  

Figure 5: Schematic of the BELLE detector at the KEK B factory.

The BELLE detector [6] is the experimental apparatus being designed for the KEK B factory. A schematic of the detector is shown in figure 5. The detector consist of a silicon vertex detector (SVD) situated just outside the beampipe. Surrounding that there is a cylindrical wire drift chamber (CDC) that measures charged tracks which extends to a radius of 90 cm. Particle identification is provided by dE/dx measurements in the CDC, and aerogel Cerenkov counter and time of flight (TOF) arrays situated radially around the CDC. Inside the superconducting solenoid is a electromagnetic calorimeter manufactured from ${\rm CsI(T}l)$ crystals. The iron return yoke of the 1.5 Tesla solenoid is interspersed with arrays of detectors for measuring muons and K⁰_L mesons. The design of the equivalent detector, BaBar, at the SLAC B factory is discussed in ref. [7].