Evaluation and reduction of ion back-flow in multi-GEM detectors |
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| Affiliation: | 1. INFN Sezione di Roma, Italy;2. Museo Storico della Fisica e Centro Studi e Ricerche “E. Fermi”, Roma, Italy;3. Laboratori Nazionali di Frascati dell?INFN, Frascati, Italy;4. Dipartimento di Scienze di Base e Applicate per Ingegneria, Sapienza Università di Roma, Italy;1. Nanotec-PSU Center of Excellence for Drug Delivery Systems, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, 90112, Thailand;2. Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, 90112 , Thailand;3. Division of Chemistry, School of Science, Walailak University, Nakhon Si Thammarat, 80161, Thailand;4. School of Pharmacy, Walailak University, Nakhon Si Thammarat, 80161, Thailand;5. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;1. School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, India;2. Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata 700064, India |
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| Abstract: | In gaseous photomultipliers, avalanche generated ions back-flowing to the photocathode can drastically limit the detector operation and lifetime. This is especially the case for photocathodes with low electron emission threshold, where impinging ions induce ion feedback effects by secondary electron emission.We present ways of reducing ion-backflow to the photocathode, and thus suppress ion-feedback effects in multi-stage Gas Electron Multiplier detectors. We studied the effect of the various electric fields on the ion transport in the detector and present our results on active ion gating with a dedicated gating electrode. |
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