P. Besson
French Alternative Energies and Atomic Energy Commission
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Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1997
R. Aleksan; L. Amerman; D. Aston; M. Benkebil; P. Besson; G. R. Bonneaud; P. Bourgeois; D. N. Brown; J. Chauveau; A. Ciocio; R. Cizeron; A. de Lesquen; L. Del Buono; S. Emery; A. Gaidot; L. Gosset; Daniel E. Hale; G. Hamel de Monchenault; O. Hamon; C. Hearty; A Jouenne; J. Kadyk; H. Kawahara; H. Krueger; G. W. London; M. Long; A. Lu; A. M. Lutz; G. Lynch; D. McShurley
Abstract The principles of the DiRC ring imaging Cherenkov technique are briefly explained and its choice for the B a B ar detector particle identification system is motivated. A large scale prototype of the DIRC for the B a B ar experiment is then described. Details of the design of this prototype and its test in a hadronic particle beam at the CERN-PS are presented, and results from various prototype and test configurations are given. For example, after correcting for geometrical acceptance and estimated collection effects, the number of photoelectrons was measured to be 146 ± 1.8 ± 9 cm −1 , for a track angle of 20° at zero photon transmission distance. The effective attenuation loss was measured to be 4.1 ± 0.7% per meter of bar length, and the observed single photon resolution was 10.0 ± 0.2 mrad. This performance is consistent with what was expected from earlier tests and Monte Carlo simulations, and will be fully adequate for the physics demands of the B a B ar experiment.
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University of Texas Health Science Center at San Antonio
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