Secondary avalanches in gas mixtures
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Date
2013-08-01
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Elsevier
Abstract
Avalanche development in gas-based detectors relies not only on direct ionisation but also on excitation of noble gas atoms. Some quencher molecules can be ionised when they collide with excited atoms, a process on which we reported earlier In Alternatively, excited atoms can decay by photon emission. If these photons are insufficiently absorbed by the quencher, yet capable of ionising, then they may escape from the avalanche region and start secondary avalanches. This process, called photon feedback, leads to an over-exponential increase of the gas gain which limits the working range. In this paper, we derive photon feedback parameters from published gain measurements for several gas mixtures and fit these parameters in a model which describes their dependence on the quencher concentration and the pressure.
Description
Bu çalışma, 20-26 Mayıs 2012 tarihleri arasında İtalya’da düzenlenen 12. Pisa Meeting on Advanced Detectors’da bildiri olarak sunulmuştur.
Keywords
Instruments & instrumentation, Nuclear science & technology, Physics, Excited states, Gas gain, Photon feedback, Proportional-counters, Excited states, Excited atoms, Gases, Atoms, Gas mixtures, Inert gases, Ionization, Photons, Gas gain, Exponential increase, Feedback parameters, Noble gas atoms, Photon emissions, Quencher concentration, Secondary avalanche
Citation
Şahin, Ö. vd. (2013). "Secondary avalanches in gas mixtures". Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 718, 432-433.