Yaxian Mao
Peking University
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Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1992
B. Adeva; M. Aguilar-Benitez; J. Alcaraz; A. Aloisio; M.G. Alviggi; D. Antreasyan; U. Becker; J. Berdugo; G.J. Bobbink; E. Brambilla; J.D. Branson; A. Bujak; C. Burgos; J.D. Burger; G. Carlino; M. Cerrada; Y.H. Chang; G. Chiefari; N. Colino; E. Drago; P. Duinker; I. Duran; F. Erne; R. Fabbretti; M. Fabre; S.S. Gau; M. Gettner; E. Gonzalez; H. van der Graaf; D. Guesewell
Abstract The design and operation of precision drift chambers with multisampling as well as the concepts and methods for reaching an extraordinary degree of precision in mechanics and calibration are described. Specific instruments were developed for this purpose. The concept of reproducible positioning and the implementation to 30 μm accuracy, showing stability over three years, is given. Calibration and analysis with UV-laser and cosmic test measurements are outlined with the critical results. The experience of calibration and reliability of the large system in an actual L3 running experiment is analyzed. The resolution under “battle conditions” at LEP resulted in Δp p = (2.50±0.04)% at 45.6 GeV and will be presented in detail. The concept is well suited for future TeV energies.
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