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https://hdl.handle.net/10316/4448| Title: | Avalanche-ion back-flow reduction in gaseous electron multipliers based on GEM/MHSP | Authors: | Maia, J. M. Mörmann, D. Breskin, A. Chechik, R. Veloso, J. F. C. A. Santos, J. M. F. dos |
Keywords: | Gas avalanche electron multipliers; Gaseous photomultipliers; Ion back-flow | Issue Date: | 2004 | Citation: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 523:3 (2004) 334-344 | Abstract: | We report on avalanche-ion back-flow measurements in the novel Micro-Hole and Strip-Plate (MHSP) multiplier and in gaseous photomultipliers comprising Gas Electron Multipliers (GEMs) followed by an MHSP. In a 3-GEMs/MHSP photomultiplier with reflective photocathode, avalanche-ion back-flow fraction of ~7% and ~2% were recorded for respective effective gains of 107 and 106, in Ar/CH4 (95/5) at 760 Torr. This is about one order of magnitude reduction in ion back-flow compared to the best values measured in 4-GEMs photomultiplier at the same gain. We describe the mode of operation of the MHSP and explain its ion back-flow reduction features. | URI: | https://hdl.handle.net/10316/4448 | DOI: | 10.1016/j.nima.2003.12.017 | Rights: | openAccess |
| Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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| filef3105ae6ac3841b1bef4c4e5736e51f4.pdf | 417.06 kB | Adobe PDF | View/Open |
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