R. W. Springer
University of Maryland, College Park
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Featured researches published by R. W. Springer.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1992
M. Arignon; A. H. Ball; K. W. Bell; M. Bramhall; A. Braun; A. A. Carter; J. R. Carter; D. G. Charlton; M. Dittmar; P. Farthouat; J. Feyt; H. Gao; J.W. Gary; J. D. Gillies; C. Greiner; R. Hammarstroem; J. C. Hart; R. D. Heuer; J. C. Hill; S. J. Hillier; T. Hilse; R. Humbert; S. Jaroslawski; D. Joos; P. Jovanovic; T. Kawamoto; R. G. Kellogg; T. Kobayashi; P. Le Du; L. J. Levinson
Abstract A pretrigger system is described for running the OPAL detector at the LEP e + e − collider with more bunches than originally foreseen. A large number of low threshold pretrigger signals are formed by several independent components of the detector, and combined by a custom-built VME-based central pretrigger logic. Flexibility, high efficiency and high redundancy in all physics channels are all achieved with low additional deadtime, without any compromise to the trigger performance.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1993
John Baines; F. Beck; H. Burckhart; D. G. Charlton; R. Cranfield; G. Crone; P. A. Elcombe; P. Farthouat; C. Fukunaga; N. I. Geddes; C. N. P. Gee; F.X. Gentit; W. Gorn; J. C. Hart; J. C. Hill; S. J. Hillier; B. Holl; R. E. Hughes-Jones; R. Humbert; M. Jimack; R. W. L. Jones; C. Kleinwort; F. Lamarche; P. Le Du; D. Lellouch; Lorne Levinson; A. Martin; J. P. Martin; F. Meijers; R. P. Middleton
Abstract This report describes the 1991 implementation of the data acquisition system of the OPAL detector at LEP including the additional services and infrastructure necessary for its correct and reliable operation. The various tasks in this “on-line” environment are distributed amongst many VME subsystems, workstations and minicomputers which communicate over general purpose local area networks and special purpose buses. The tasks include data acquisition, control, monitoring, calibration and event reconstruction. The modularity of both hardware and software facilitates the upgrading of the system to meet new requirements.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
G. Artusi; L. Biffoni; S. Bimbi; P. Capiluppi; L. Degli Esposti; M.M. Deninno; F. Fabbri; M. Ferrari; G. Giacomelli; S. Marcellini; L. Marradi; F. Massera; A. Montanari; F. Odorici; O. Polgrossi; F. Rimondi; A. M. Rossi; G. Sanzani; S. Tuffanelli; R. Lorenzi; A. H. Ball; R. Bard; D. Bensen; C. Cates; J.D. Colmer; P. Floros; P.R. Goldey; Richard G Kellogg; J.R. Lee; W.W. Miller
Abstract This paper describes the manufacture of multicell plastic limited streamer chambers for use in the hadron calorimeter of the OPAL detector at LEP. The chambers are of the PVC coverless type with highly resistive cathodes. We discuss the assembly procedure with particular emphasis on the crucial cathode preparation process. A summary of test results is also presented.
IEEE Transactions on Nuclear Science | 1990
A. H. Ball; R. Bard; D. Bensen; C. Cates; J.D. Colmer; P. Floros; D.J. Fritz; P.R. Goldey; W.W. Miller; D.T. Norkin; P. Rapp; P.S. Rozmarynowski; J.R. Lee; M. San Sebastian; J. Schultz; A. Skuja; R. W. Springer; J. Subramanyam; T. Zawistowski; G.T. Zorn
The manufacture and testing of multicell limited streamer chambers for use in the hadron calorimeter of the OPAL detector and LEP (Large Electron Positron Collider) are described. All operations, from chamber cathode coating to the testing of completed subassemblies, have been performed under the same roof. With reasonable care and quality control, the established technology produced chambers several meters long with an overall success rate of about 90%. Treatment of the carbon coating with Breox B-35 was effective in eliminating uncertainties in the cathode performance. >
