Experimental validation of an integrated modelling approach to neutron emission studies at JET
Abstract
An integrated modelling methodology for the calculation of realistic plasma neutron sources for the JET tokamak has been developed. The computational chain comprises TRANSP plasma transport and DRESS neutron spectrum calculations, and their coupling to the MCNP neutron transport code, bridging plasma physics and neutronics. Here, we apply the developed methodology to the analysis of neutron emission properties of deuterium and helium plasmas at JET, and validate individual modelling steps against neutron diagnostic measurements. Two types of JET discharges are modelled—baseline-like and three-ion radio-frequency scenarios—due to their diversity in plasma heating, characteristics of the induced fast ion population, and the imprint of these on neutron emission properties. The neutron emission modelling results are quantitatively compared to the total neutron yield from fission chambers, neutron emissivity profiles from the neutron camera, neutron spectra from the time-of-flight spectrometer, and neutron activation measurements. The agreement between measured and calculated quantities is found to be satisfactory for all four diagnostic systems within the estimated experimental and computational uncertainties. Additionally, the effect of neutrons not originating from the dominating D(D, n)3He reactions is studied through modelling of triton burnup DT neutrons, and, in mixed D-3He plasmas, neutrons produced in the 9Be(D, nγ)10B reaction on impurities.more »
- Authors:
-
[1];
[3];
[7];
[2];
[2];
[9];
[2];
- Jozef Stefan Inst. (IJS), Ljubljana (Slovenia); United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)
- United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)
- Uppsala Univ. (Sweden)
- Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
- Royal Military Academy (ERM) (Belgium). Laboratory for Plasma Physics (LPP)
- National Institute for Laser, Plasma and Radiation Physics (Romania)
- Univ. di Milano-Bicocca (Italy)
- Univ. of Helsinki (Finland)
- Kharkiv Institute of Physics and Technology (Ukraine)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; European Atomic Energy Community; Slovenian Research Agency
- Contributing Org.:
- JET Contributors
- OSTI Identifier:
- 1885795
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 12; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma neutron source; neutron diagnostics; fast ions; neutron activation; integrated modelling; JET; TRANSP
Citation Formats
Štancar, Ž., Ghani, Z., Eriksson, J., Žohar, A., Conroy, S., Kazakov, Ye O., Craciunescu, T., Kirov, K., Nocente, M., Garzotti, L., Radulović, V., Sirén, P., Kiptily, V., Baranov, Y., Szepesi, G., Dreval, M., Gorelenkova, M., Weisen, H., Militello-Asp, E., and Snoj, L. Experimental validation of an integrated modelling approach to neutron emission studies at JET. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/ac3021.
Štancar, Ž., Ghani, Z., Eriksson, J., Žohar, A., Conroy, S., Kazakov, Ye O., Craciunescu, T., Kirov, K., Nocente, M., Garzotti, L., Radulović, V., Sirén, P., Kiptily, V., Baranov, Y., Szepesi, G., Dreval, M., Gorelenkova, M., Weisen, H., Militello-Asp, E., & Snoj, L. Experimental validation of an integrated modelling approach to neutron emission studies at JET. United States. https://doi.org/10.1088/1741-4326/ac3021
Štancar, Ž., Ghani, Z., Eriksson, J., Žohar, A., Conroy, S., Kazakov, Ye O., Craciunescu, T., Kirov, K., Nocente, M., Garzotti, L., Radulović, V., Sirén, P., Kiptily, V., Baranov, Y., Szepesi, G., Dreval, M., Gorelenkova, M., Weisen, H., Militello-Asp, E., and Snoj, L. Wed .
"Experimental validation of an integrated modelling approach to neutron emission studies at JET". United States. https://doi.org/10.1088/1741-4326/ac3021. https://www.osti.gov/servlets/purl/1885795.
@article{osti_1885795,
title = {Experimental validation of an integrated modelling approach to neutron emission studies at JET},
author = {Štancar, Ž. and Ghani, Z. and Eriksson, J. and Žohar, A. and Conroy, S. and Kazakov, Ye O. and Craciunescu, T. and Kirov, K. and Nocente, M. and Garzotti, L. and Radulović, V. and Sirén, P. and Kiptily, V. and Baranov, Y. and Szepesi, G. and Dreval, M. and Gorelenkova, M. and Weisen, H. and Militello-Asp, E. and Snoj, L.},
abstractNote = {An integrated modelling methodology for the calculation of realistic plasma neutron sources for the JET tokamak has been developed. The computational chain comprises TRANSP plasma transport and DRESS neutron spectrum calculations, and their coupling to the MCNP neutron transport code, bridging plasma physics and neutronics. Here, we apply the developed methodology to the analysis of neutron emission properties of deuterium and helium plasmas at JET, and validate individual modelling steps against neutron diagnostic measurements. Two types of JET discharges are modelled—baseline-like and three-ion radio-frequency scenarios—due to their diversity in plasma heating, characteristics of the induced fast ion population, and the imprint of these on neutron emission properties. The neutron emission modelling results are quantitatively compared to the total neutron yield from fission chambers, neutron emissivity profiles from the neutron camera, neutron spectra from the time-of-flight spectrometer, and neutron activation measurements. The agreement between measured and calculated quantities is found to be satisfactory for all four diagnostic systems within the estimated experimental and computational uncertainties. Additionally, the effect of neutrons not originating from the dominating D(D, n)3He reactions is studied through modelling of triton burnup DT neutrons, and, in mixed D-3He plasmas, neutrons produced in the 9Be(D, nγ)10B reaction on impurities. It is found that these reactions can contribute up to several percent to the total neutron yield and dominate the neutron activation of samples. Finally, the effect of MeV-range fast ions on the neutron activation of 115In and 27Al samples is measured and computationally validated.},
doi = {10.1088/1741-4326/ac3021},
journal = {Nuclear Fusion},
number = 12,
volume = 61,
place = {United States},
year = {Wed Nov 03 00:00:00 EDT 2021},
month = {Wed Nov 03 00:00:00 EDT 2021}
}
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