skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multiphysics approach to plasma neutron source modelling at the JET tokamak

Abstract

A novel multiphysics methodology for the computation of realistic plasma neutron sources has been developed. The approach is based on state-of-the-art plasma transport and neutron spectrum calculations, coupled with a Monte Carlo neutron transport code, bridging the gap between plasma physics and neutronics. In the paper two JET neutronics tokamak models are used to show the application of the developed plasma neutron sources and validate them. Diagnostic data for the record JET D discharge 92436 are used as input for the TRANSP code, modelling neutron emission in two external plasma heating scenarios, namely using only neutral beam injection and a combination of the latter and ion cyclotron resonance heating. Neutron spectra, based on plasma transport results, are computed using the DRESS code. The developed PLANET code package is employed to generate plasma neutron source descriptions and couple them with the MCNP code. The effects of using the developed sources in neutron transport calculations on the response of JET neutron diagnostic systems is studied and compared to the results obtained with a generic plasma neutron source. It is shown that, although there are significant differences in the emissivity profiles, spectra shape and anisotropy between the neutron sources, the integral response ofmore » the time-resolved ex-vessel neutron detectors is largely insensitive to source changes, with major relative deviations of up to several percent. However it is calculated that, because of the broadening of neutron spectra as a consequence of external plasma heating, larger differences may occur in activation of materials which have threshold reactions located at DD neutron peak energies. The PLANET plasma neutron source computational methodology is demonstrated to be suitable for detailed neutron source effect studies on JET during DT experiments and can be applied to ITER analyses.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [6];  [1]
  1. Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Uppsala Univ. (Sweden)
  4. Univ. Nacional de Educacin a Distancia, Madrid (Spain)
  5. United Kingdom Atomic Energy Authority, Abingdon (United Kingdom)
  6. Ecole Polytechnique Federale Lausanne (EPFL) (Switzlerland)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; EUROfusion Consortium
Contributing Org.:
JET Contributors
OSTI Identifier:
1543456
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 9; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Štancar, Žiga, Gorelenkova, Marina, Conroy, Sean, Sauvan, Patrick, Buchanan, James, Weisen, Henri, and Snoj, Luka. Multiphysics approach to plasma neutron source modelling at the JET tokamak. United States: N. p., 2019. Web. https://doi.org/10.1088/1741-4326/ab2c8b.
Štancar, Žiga, Gorelenkova, Marina, Conroy, Sean, Sauvan, Patrick, Buchanan, James, Weisen, Henri, & Snoj, Luka. Multiphysics approach to plasma neutron source modelling at the JET tokamak. United States. https://doi.org/10.1088/1741-4326/ab2c8b
Štancar, Žiga, Gorelenkova, Marina, Conroy, Sean, Sauvan, Patrick, Buchanan, James, Weisen, Henri, and Snoj, Luka. Tue . "Multiphysics approach to plasma neutron source modelling at the JET tokamak". United States. https://doi.org/10.1088/1741-4326/ab2c8b. https://www.osti.gov/servlets/purl/1543456.
@article{osti_1543456,
title = {Multiphysics approach to plasma neutron source modelling at the JET tokamak},
author = {Štancar, Žiga and Gorelenkova, Marina and Conroy, Sean and Sauvan, Patrick and Buchanan, James and Weisen, Henri and Snoj, Luka},
abstractNote = {A novel multiphysics methodology for the computation of realistic plasma neutron sources has been developed. The approach is based on state-of-the-art plasma transport and neutron spectrum calculations, coupled with a Monte Carlo neutron transport code, bridging the gap between plasma physics and neutronics. In the paper two JET neutronics tokamak models are used to show the application of the developed plasma neutron sources and validate them. Diagnostic data for the record JET D discharge 92436 are used as input for the TRANSP code, modelling neutron emission in two external plasma heating scenarios, namely using only neutral beam injection and a combination of the latter and ion cyclotron resonance heating. Neutron spectra, based on plasma transport results, are computed using the DRESS code. The developed PLANET code package is employed to generate plasma neutron source descriptions and couple them with the MCNP code. The effects of using the developed sources in neutron transport calculations on the response of JET neutron diagnostic systems is studied and compared to the results obtained with a generic plasma neutron source. It is shown that, although there are significant differences in the emissivity profiles, spectra shape and anisotropy between the neutron sources, the integral response of the time-resolved ex-vessel neutron detectors is largely insensitive to source changes, with major relative deviations of up to several percent. However it is calculated that, because of the broadening of neutron spectra as a consequence of external plasma heating, larger differences may occur in activation of materials which have threshold reactions located at DD neutron peak energies. The PLANET plasma neutron source computational methodology is demonstrated to be suitable for detailed neutron source effect studies on JET during DT experiments and can be applied to ITER analyses.},
doi = {10.1088/1741-4326/ab2c8b},
journal = {Nuclear Fusion},
number = 9,
volume = 59,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Neutron measurement techniques for tokamak plasmas
journal, February 1994


Fusion yield measurements on JET and their calibration
journal, November 2014


Calibration of neutron detectors on the Joint European Torus
journal, October 2017

  • Batistoni, Paola; Popovichev, S.; Conroy, S.
  • Review of Scientific Instruments, Vol. 88, Issue 10
  • DOI: 10.1063/1.4991780

The calibration of the MAST neutron yield monitors
journal, June 2006

  • Stammers, Keith; Loughlin, M. J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 562, Issue 1
  • DOI: 10.1016/j.nima.2006.03.012

Tokamak plasma diagnostics based on measured neutron signals
journal, May 1999


Direct tritium production measurement in irradiated lithium
journal, March 1973


Neutron spectroscopy results of JET high-performance plasmas and extrapolations to DT performance
journal, October 2010

  • Hellesen, C.; Andersson Sundén, E.; Conroy, S.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3502326

Diagnosis of physical parameters of fast particles in high power fusion plasmas with high resolution neutron and gamma-ray spectroscopy
journal, June 2013


Calculations to support JET neutron yield calibration: Contributions to the external neutron monitor responses
journal, May 2012


Calculations to support JET neutron yield calibration: Neutron scattering in source holder
journal, November 2012


Calculations to support JET neutron yield calibration: Modelling of the JET remote handling system
journal, August 2013


Neutronics requirements for a DEMO fusion power plant
journal, October 2015


Radiation damage and nuclear heating studies in selected functional materials during the JET DT campaign
journal, November 2016


Tokamak D-T neutron source models for different plasma physics confinement modes
journal, August 2012


Calculations to Support In Situ Neutron Yield Calibrations at the Joint European Torus
journal, August 2018


Energetic particle physics in fusion research in preparation for burning plasma experiments
journal, November 2014


Analysis of neutron energy spectra from neutral beam heated plasmas in the JET tokamak
journal, February 1993


Neutron spectroscopy measurements and modeling of neutral beam heating fast ion dynamics
journal, July 2010


Generation of a plasma neutron source for Monte Carlo neutron transport calculations in the tokamak JET
journal, November 2018


Numerical Transport Codes
journal, February 2012

  • Ongena, J. P. H. E.; Voitsekhovitch, I.; Evrard, M.
  • Fusion Science and Technology, Vol. 61, Issue 2T
  • DOI: 10.13182/FST12-A13505

New techniques for calculating heat and particle source rates due to neutral beam injection in axisymmetric tokamaks
journal, September 1981


The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
journal, June 2004

  • Pankin, Alexei; McCune, Douglas; Andre, Robert
  • Computer Physics Communications, Vol. 159, Issue 3
  • DOI: 10.1016/j.cpc.2003.11.002

Numerical simulation of ion cyclotron waves in tokamak plasmas
journal, January 1999


Calculating fusion neutron energy spectra from arbitrary reactant distributions
journal, February 2016


On the absolute calibration of neutron measurements in fusion reactors
journal, April 2016


TRANSP modelling of total and local neutron emission on MAST
journal, January 2015


The Analysis of the External Neutron Monitor Responses in a Simplified JET-Like Tokamak Using ADVANTG
journal, February 2017

  • Čufar, Aljaž; Kos, Bor; Kodeli, Ivan Aleksander
  • Fusion Science and Technology, Vol. 71, Issue 2
  • DOI: 10.13182/FST16-113

Use of Activation Technique for the Measurement of Neutron Yields from Deuterium Plasmas at the Joint European Torus
journal, November 1991

  • Jarvis, Owen N.; Clipsham, Edward W.; Hone, Malcolm A.
  • Fusion Technology, Vol. 20, Issue 3
  • DOI: 10.13182/FST91-A29668

Equilibrium analysis of iron core tokamaks using a full domain method
journal, August 1992


Finite Larmor radii effects in fast ion measurements with neutron emission spectrometry
journal, December 2012


Neutron spectroscopy measurements of 14 MeV neutrons at unprecedented energy resolution and implications for deuterium–tritium fusion plasma diagnostics
journal, March 2018

  • Rigamonti, D.; Giacomelli, L.; Gorini, G.
  • Measurement Science and Technology, Vol. 29, Issue 4
  • DOI: 10.1088/1361-6501/aaa675

Modelling and TOFOR measurements of scattered neutrons at JET
journal, June 2010


Activation of ITER materials in JET: nuclear characterisation experiments for the long-term irradiation station
journal, July 2018


Synthetic neutron camera and spectrometer in JET based on AFSI-ASCOT simulations
journal, September 2017


The ‘neutron deficit’ in the JET tokamak
journal, June 2017


Versatile fusion source integrator AFSI for fast ion and neutron studies in fusion devices
journal, November 2017


Absolute calibration of microfission chamber in JT-60U
journal, October 2008

  • Hayashi, Takao; Nishitani, Takeo; Sukegawa, Atsuhiko M.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2968709

Diagnostic neutron activation system for KSTAR
journal, May 2012


Initial result of neutron energy spectrum reconstruction using multi-foil activation method in KSTAR
journal, November 2018