Design and tests of the z-coordinate drift chamber system for the opal central detector at LEP |
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| Affiliation: | 1. Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan;2. International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan;3. Saskatoon Cancer Centre and College of Medicine, University of Saskatchewan, Saskatoon, Canada;1. European Organization for Nuclear Research (CERN), Esplanade des Particules 1, 1211 Genéve 23, Switzerland;2. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada;3. University of British Columbia, Department of Chemistry, Vancouver, British Columbia V6T 1Z1, Canada;4. SCK·CEN, B-2400 Mol, Belgium;5. INFN, Laboratori Nazionali di Legnaro, viale dell’Universitá 2, 35020 Legnaro (PD), Italy;6. Ludwig-Maximilians-Universität Munich Faculty of Physics, Schellingstrasse 4, 80799 Munich, Germany;1. Drug Delivery and Disposition, KU Leuven Department of Pharmaceutical and Pharmacological Sciences, Belgium;2. University Hospitals Leuven, Department of Gastroenterology, Belgium;1. Center for Experimental Nuclear Physics and Astrophysics, Department of Physics, University of Washington, Seattle, WA 98195, USA;2. Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;4. Institute of Physics, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany;5. Laboratory of Optoelectronics and Devices, University of Setif, UFA Setif, Setif 19000, Algeria;6. Department of Physics, University of North Carolina, Chapel Hill, NC 27599, USA;7. Triangle Universities Nuclear Laboratory, Durham, NC 27708, USA;8. Institute for Experimental Nuclear Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;9. Wigner Research Center for Physics, P.O. Box 49, 1525 Budapest, Hungary;10. Institute for Nuclear Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;11. ASTeC Vacuum Science Group, STFC Daresbury Laboratory, Warrington, Cheshire WA4 4AD, UK;12. Institute of Nuclear Physics, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany;13. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. School of Environment, The University of Auckland, Auckland, New Zealand;2. Instituto de Ecología Regional (IER), Universidad Nacional de Tucumán (UNT)- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Tucumán, Argentina;3. Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán (UNT), Tucumán, Argentina |
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| Abstract: | A system of drift chambers has been designed to make high resolution measurements of the z-coordinates of charged tracks at the outer radius of the OPAL central detector at LEP. The unit module of this detector is a 25 cm drift length bidirectional cell with six sense wires in a thin 50 cm wide by 29 mm high drift slot. Tests indicate that the chamber has a wide and stable electric field operating range and its performance is unaffected by small misalignments between the drift electric field and an external magnetic field. The drift cell was found to have uniform acceptance up to its geometrical boundaries, and the z-resolution for beam tracks normal to the chamber was measured to be in the range of 40–175 μm. |
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