J. Walsh
University of Wisconsin-Madison
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Featured researches published by J. Walsh.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1998
D. Creanza; M. De Palma; G. Maggi; G. Selvaggi; Lucia Silvestris; G. Raso; P. Tempesta; M. Burns; P. Coyle; Markus Frank; L. Moneta; G. Rizzo; M. Wachnik; A. Wagner; E. Focardi; G. Parrini; E. Scarlini; A.W. Halley; V. O’Shea; C. Raine; G. Barber; W. Cameron; P.J. Dornan; D. Gentry; N. Konstantinidis; A. Moutoussi; J. Nash; D. Price; A.M. Stacey; L.W. Toudup
The ALEPH collaboration, in view of the importance of effective vertex detection for the Higgs boson search at LEP 2, decided to upgrade the previous vertex detector. Main changes were an increased length (+/- 20 cm), a higher granularity for r phi view (50 mu m), a new preamplifier (MX7 rad hard chip), a polymide (upilex) fan-out on z side to carry the signals from the strips to the front-end electronics outside the fiducial region reducing consequently the passive material in the central region by a factor of two. The detector, the running experience and its performance will be described
arXiv: Instrumentation and Detectors | 1999
G. Sguazzoni; D. Creanza; M. De Palma; G. Maggi; G. Raso; G. Selvaggi; L. Silvestris; P. Tempesta; M. Burns; M. Frank; P. Maley; M. Morel; A Wagner; E. Focardi; G. Parrini; E. Scarlini; A.W. Halley; V. O'Shea; C. Raine; G. Barber; W. Cameron; P.J. Dornan; D. Gentry; A. Moutoussi; J. A. Nash; D. Price; A.M. Stacey; L.W. Toudup; M.I. Williams; M. Billault
Abstract The ALEPH Silicon Vertex Detector features an optical fibre laser system to monitor its mechanical stability. The operating principle and the general performance of the laser system are described. The experience obtained during 1997 and 1998 operations confirms the important role that such a system can have with respect to the detector alignment requirements. In particular, the laser system has been used to monitor short-term temperature-related effects and long-term movements. These results and a description of the laser-based alignment correction applied to the 1998 data are presented.
