Time of flight counter (TOF) and electronics system
contains the barrel part and the end part. The barrel part is composed of
48 plastic scintillators with each being 2.8 m long, optic fibers,
photo-multipliers and electronics circuits whereas the end part is
composed of 2×24
trapezoidal scintillators, optic fibers, photo-multipliers, electronics
circuits, etc. It operates to measure the speed of the charged particles.
Shower counter and electronics system
barrel part of the shower counter comprises 24 layers of counter units
(13,430 in total) with each layer being 3.85 m long, and 6,721 channels of
electronics circuits. The shower counter is intended for the measurement
of the energy of charged particles or neutral particles.
MDC in stringing
µ Identifier and electronics system
µ identifier is composed of 3 layers of square aluminum proportional
chambers totaling 1500 with each being 4 m long and related electronics
circuits. It can record the muons that have very strong penetrating
ability and determine the position of bombardment.
solenoid with an outer diameter of 4 m, 3 layers of octagonal yokes and
the power supplies constitute the spectrometer system that can provide a
uniform magnetic field of 4000 gauss.
is used to monitor the luminosity of the BEPC.
Trigger, online data acquisition and analysis, offline data
fast electronics circuits are used to store large amount of data coming
from the detector, and for trigger digitalization treatment.
Institute of High Energy Physics 17/07/02