R. Adler et al., THE CPLEAR DETECTOR AT CERN, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 379(1), 1996, pp. 76-100
The CPLEAR collaboration has constructed a detector at CERN for an ext
ensive programme of CP-, T- and CPT-symmetry studies using K-0 and <(K
)over bar (0)> produced by the annihilation of <(p)over bar 's> in a h
ydrogen gas target. The K-0 and <(K)over bar (0)> are identified by th
eir companion products of the annihilation K(+/-)pi(-/+) which are tra
cked with multiwire proportional chambers, drift chambers and streamer
tubes. Particle identification is carried out with a liquid Cherenkov
detector for fast separation of pions and kaons and with scintillator
s which allow the measurement of time of flight and energy loss. Photo
ns are measured with a lead/gas sampling electromagnetic calorimeter.
The required antiproton annihilation modes are selected by fast online
processors using the tracking chamber and particle identification inf
ormation. All the detectors are mounted in a 0.44 T uniform field of a
n axial solenoid of diameter 2 m and length 3.6 m to form a magnetic s
pectrometer capable of full on-line reconstruction and selection of ev
ents. The design, operating parameters and performance of the subdetec
tors are described.