Abstract :
A new general spectrometer, BESIII, is under-construction for the Beijing Electron Positron Collider II (BEPCII) operated at a center of mass energy of 2-5 GeV with a designed highest luminosity of 1times1033cm-2s-1. The Time of Flight (TOF) and Electromagmetic Calorimeter (EMC), the two of four detectors of BESIII, are introduced. The main target of TOF is to identify the pion and kaon with its good times resolution of 90 ps, which is composed of plastic scintillator directly coupled with fine-mesh PMTs. The EMC can reach the energy resolution of 2.5% and space resolution of 0.6 cm for 1 GeV. It is made up of 6340 Csl crystals with reflectively wrapping and these crystals are directly suspended one by one without honeycomb-like support to decrease the dead area and increase properties. The presentation contains the detector design, space alignment, beam tests, PMT and photodiode tests, scintillator tests, wrapping material tests, preamp, FEE, quality control and project schedule.
Keywords :
colliding beam accelerators; electron accelerators; nuclear electronics; particle calorimetry; photodiodes; photomultipliers; position sensitive particle detectors; preamplifiers; quality control; solid scintillation detectors; storage rings; BEPCII; BESIII spectrometer; Beijing Electron Positron Collider II; CsI(Tl) crystals; EMC; TOF; beam tests; center of mass energy; electromagmetic calorimeter; fine-mesh PMT; kaon identification; photodiode tests; photomultiplier; pion identification; plastic scintillator; preamplifier; quality control; space alignment; time of flight detector; wrapping material tests; Crystals; Detectors; Electromagnetic compatibility; Electrons; Energy resolution; Mass spectroscopy; Materials testing; Mesons; Positrons; Wrapping;
