Performance of a gas avalanche pixel detector of 50 /spl mu/m pitch
| Autor: | H.S. Cho, S.H. Han, W.S. Hong, Victor Perez-Mendez, J. A. Kadyk, F. Retiere |
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| Rok vydání: | 2000 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics::Instrumentation and Detectors business.industry Microdot Detector Computer Science::Software Engineering Square (algebra) Avalanche multiplication Surface coating Nonlinear Sciences::Adaptation and Self-Organizing Systems Optics Nuclear Energy and Engineering Gas gain Maximum gain Electrical and Electronic Engineering business Pixel detector |
| Zdroj: | IEEE Transactions on Nuclear Science. 47:2065-2069 |
| ISSN: | 1558-1578 0018-9499 |
| DOI: | 10.1109/23.903848 |
| Popis: | We describe the performance of a square micro-dot (MDOT) detector of 50 /spl mu/m pitch, in terms of the defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 /spl mu/m pitch MDOT. Initial charge build-up on the detector surface was also minimized when the small lateral dimension was combined with a surface coating. The maximum gas gain was limited to /spl sim/1200 due to the small distance available for avalanche multiplication. We also developed a two-level microdot, namely a closed-end gas electron multiplication (CEGEM) chamber. A CEGEM detector having a pitch of 200 /spl mu/m, holes of 40 /spl mu/m width and a spacer layer of 18.5 /spl mu/m thickness showed a maximum gain of /spl sim/400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size. |
| Databáze: | OpenAIRE |
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