Detailed reproduction of the neutron emission from the compact DT neutron generator used as an in-situ 14 MeV calibration neutron source at JET
| Autor: | Marco Tardocchi, Luca Giacomelli, A. Milocco, D. Rigamonti, Igor Lengar, Aljaž Čufar, Sergey Popovichev, Z. Ghani, Marica Rebai, Luka Snoj, Mario Pillon, Stefano Loreti, Paola Batistoni |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Neutron transport Neutron emission dt neutron generator neutron detectors QC1-999 Astrophysics::High Energy Astrophysical Phenomena Nuclear Theory calibration 01 natural sciences 010305 fluids & plasmas Computational physics Neutron spectroscopy 010309 optics Neutron generator 0103 physical sciences Calibration Neutron source Neutron detection neutron source characterization Neutron Nuclear Experiment |
| Zdroj: | EPJ Web of Conferences, Vol 225, p 02005 (2020) 6th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), pp. 02005-1–02005-6, Portoroz, Slovenia, 17-21 Jun 2019 info:cnr-pdr/source/autori:Cufar, Aljaz; Batistoni, Paola; Ghani, Zamir; Giacomelli, Luca; Lengar, Igor; Loreti, Stefano; Milocco, Alberto; Popovichev, Sergey; Pillon, Mario; Rigamonti, Davide; Rebai, Marica; Tardocchi, Marco; Snoj, Luka/congresso_nome:6th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA)/congresso_luogo:Portoroz, Slovenia/congresso_data:17-21 Jun 2019/anno:2020/pagina_da:02005-1/pagina_a:02005-6/intervallo_pagine:02005-1–02005-6 EPJ Web of Conferences |
| ISSN: | 2100-014X |
| Popis: | A compact DT neutron generator (NG) based on the mixed-beam operation was used as a calibration neutron source in the latest in-situ calibration of neutron detectors at the Joint European Torus (JET). In order to meet the requirement for the total uncertainty of the neutron detector calibration below ±10 %, the neutron emission properties had to be experimentally characterized and reproduced through detailed modelling of the neutron source characteristics and geometry of the neutron generator. The detailed neutronics simulations were an essential part of both NG characterization and JET neutron detector calibration. The complex neutron emission properties of the NG were reproduced through a combination of simulations and highresolution neutron spectroscopy measurements. This meant that six different DT neutron source components resulting from NG's mixed beam operation were explicitly simulated and their relative intensities scaled based on experimentally obtained neutron spectrum measurements. Furthermore, the detailed model of the NG's geometry was produced based on information from the supplier of the NG and images from a computer tomography (CT) scan. Finally, the positioning of the neutron source inside the JET tokamak during in-situ calibration was reproduced based on the information from the remote handling system (RHS) at JET, the system responsible for the positioning of the source during the calibration experiment. The extensive effort presented in the paper significantly contributed to the total uncertainties of the calibration factors well within the target value of ±10 %. |
| Databáze: | OpenAIRE |
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