The OPAL vertex detector prototype
| Autor: | J.M. Roney, Stephen Lloyd, L. Godfrey, A. C. McPherson, J.L. Pinfold, R.K. Carnegie, A. A. Carter, P. A. Elcombe, J. C. Armitage, G.L. Giles, J. Waterhouse, C. K. Hargrove, R. J. Hemingway, John Hill, T.W. Pritchard, J. R. Carter |
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| Rok vydání: | 1989 |
| Předmět: |
Physics
Nuclear and High Energy Physics Argon Large Hadron Collider Physics::Instrumentation and Detectors Bar (music) Resolution (electron density) Detector chemistry.chemical_element Tracking (particle physics) Charged particle Nuclear physics chemistry Vertex (curve) High Energy Physics::Experiment Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 279:236-242 |
| ISSN: | 0168-9002 |
| Popis: | The prototype test results of a high resolution charged particle tracking detector are reported. The detector is designed to measure vertex topologies of particles produced in the e+e− collisions of the OPAL experiment at LEP. The OPAL vertex detector is a 1 m long, 0.46 m diameter cylindrical drift chamber consisting of an axial and stereo layer each of which is divided into 36 jet cells. A prototype chamber containing four axial and two stereo cells was studied using a pion test beam at CERN. The studies examined the prototype under a variety of operating conditions. An r−φ resolution of 60 μm was obtained when the chamber was operated with argon (50%)-ethane (50%) at 3.75 bar, and when CO2(80%)-isobutane (20%) at 2.5 bar was used a 25 μm resolution was achieved. A z measurement using end-to-end time difference has a resolution of 3.5 cm. The details of these prototype studies are discussed in this paper. |
| Databáze: | OpenAIRE |
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