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Liquid Scintillators Neutron Response Function: A Tutorial
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
2019 (English)In: Journal of fusion energy, ISSN 0164-0313, E-ISSN 1572-9591, Vol. 38, no 3-4, p. 356-375Article in journal (Refereed) Published
Abstract [en]

This tutorial is devoted to the understanding of the different components that are present in the neutron light output pulse height distribution of liquid scintillators in fusion relevant energy ranges. The basic mechanisms for the generation of the scintillation light are briefly discussed. The different elastic collision processed between the incident neutrons and the hydrogen and carbon atoms are described in terms of probability density functions and the overall response function as their convolution. The results from this analytical approach is then compared with those obtained from simplified and full Monte Carlo simulations. Edge effect, finite energy resolution, light output and transport and competing physical processes between neutron and carbon and hydrogen atoms and their impact on the response functions are discussed. Although the analytical treatment here presented allows only for a qualitative comparison with full Monte Carlo simulations it enables an understanding of the main features present in the response function and therefore provides the ground for the interpretation of more complex response functions such those measured in fusion plasmas. Although the main part of this tutorial is focused on the response function to mono-energetic 2.45 MeV neutrons a brief discussion is presented in case of broad neutron energy spectra and how these can be used to infer the underlying properties of fusion plasmas via the application of a forward modelling method.

Place, publisher, year, edition, pages
SPRINGER , 2019. Vol. 38, no 3-4, p. 356-375
Keywords [en]
Fusion reactions, Neutron, Liquid scintillator, Response function, Elastic scattering, Probability density function, Convolution, Energy resolution, Efficiency, Forward modelling
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-391293DOI: 10.1007/s10894-019-00212-wISI: 000476509600008OAI: oai:DiVA.org:uu-391293DiVA, id: diva2:1344812
Funder
Swedish Research Council, 2015-03869EU, Horizon 2020, 633053Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-08-22Bibliographically approved

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