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Electromagnetic calorimeters

In order to measure the energy of the outgoing electrons and photons, a number of calorimeters are positioned around the tracking detectors. The particles collide with the massive detectors to generate particle showers that are contained in the detector and the energy sum is measured. In the barrel region the High density Projection Chamber (HPC) [7] is positioned between 208 and 260 cm. The detector has a resolution of about 1^o in $\phi$ and about 4 mm in z, and the energy can be determined to a precision of about 25%/$\sqrt{E}$+7%. To close the barrel region of the HPC, two diskshaped calorimeters are placed in the forward region. This is the FEMC (Forward Electromagnetic Calorimeter) [8] that is 5 meters in diameter and has and angular precision about 1^o and a energy resolution of about 4% at 45 GeV.