The CPLEAR detector at CERN

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 1996-09, Vol.379 (1), p.76-100
• Main Authors: Adler, R., Albrecht, W., Alhalel, T., Angelopoulos, A., Aslanides, E., Backenstoss, G., Barraca, D., Behnke, O., Bennet, J., Bertin, V., Bloch, P., Bonnet, M., Calzas, A., Cawley, E., Charalambous, S., Chardin, G., Chertok, M.B., Cody, A., Daniel, R., Dechelette, P., Dedieu, M., Dedoussis, S., Dejardin, M., Derre, J., Dijksman, A., Dodgson, M., Ealet, A., Eleftheriadis, C., Engster, C., Evangelou, I., Faravel, L., Fassnacht, P., Faure, J.L., Felder, C., Ferreira-Marques, R., Fetscher, W., Fidecaro, M., Filipčič, A., Fuglesang, C., Gabathuler, E., Gally, Y., Gamet, R., Geiss, D., Gerber, H.-J., Go, A., Gumplinger, P., Harrison, P., Harrison, P.F., Hayman, P.J., Hazen, E., Heyes, W.G., Hollander, R.W., Hubert, E., Jansson, K., Jon-And, K., Karkour, N., Kern, J., Kettle, P.-R., Klados, T., Kochowski, C., Kontek, K., Lawry, T., Lecouturier, D., Le Gac, R., Leimgruber, F., Liolios, A., Mall, U., Marel, G., Miller, J., Nakada, T., Nanni, F., Pagels, B., Papadopoulos, I., Pelucchi, F., Philippoussis, K., Pinto da Cunha, J., Policarpo, A., Postma, H., Rheme, Ch, Rickenbach, R., Rozaki, E., Ruf, T., Sakeliou, L., Sanders, P., Schaller, L.A., Schopper, A., Schune, P., Steinacher, M., Tauscher, L., Triantis, F., Tsamouranis, I., Tschopp, H., van Eijk, C.W.E., van Koningsveld, B., Varner, G., Verweij, H., Warner, D., Watson, E., Weber, P., Wolter, M.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/0168-9002(96)00542-6

The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using K 0 and K 0 produced by the annihilation of p 's in a hydrogen gas target. The K 0 and K 0 are identified by their companion products of the annihilation K ± π ∓ which are tracked 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 scintillators which allow the measurement of time of flight and energy loss. Photons 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 information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full on-line reconstruction and selection of events. The design, operating parameters and performance of the subdetectors are described.