Estimation of 14 MeV neutron rate from triton burn-up in future W7-X deuterium plasma campaigns

Koschinsky, J. P.; Äkäslompolo, S.; Biedermann, C.; Bozhenkov, S. A.; Isobe, M.; Kontula, J.; Ogawa, K.; Schneider, W.; Warmer, F.; Wurden, G. A.; Wolf, R. C.

doi:10.1002/ctpp.201900186

Estimation of 14 MeV neutron rate from triton burn-up in future W7-X deuterium plasma campaigns

Journal Article · Tue Feb 11 00:00:00 EST 2020 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201900186· OSTI ID:1650629

Koschinsky, J. P. ^[1]; Äkäslompolo, S. ^[1]; Biedermann, C. ^[1]; Bozhenkov, S. A. ^[1]; Isobe, M. ^[2]; Kontula, J. ^[3]; Ogawa, K. ^[2]; Schneider, W. ^[1]; Warmer, F. ^[1]; Wurden, G. A. ^[4]; Wolf, R. C. ^[1]

Max Planck Inst. for Plasma Physics, Greifswald (Germany)
National Inst. of Natural Sciences, Toki (Japan). National Inst. for Fusion Science; Graduate Univ. for Advanced Studies (SOKENDAI), Toki (Japan)
Aalto Univ., Espoo (Finland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Fast ion confinement is of major importance for the ignition of a burning fusion plasma. In future deuterium plasma campaigns of the Wendelstein 7-X stellarator, W7-X, the amount of triton burn-up is one possible measure for fast ion confinement. A well-established technique to observe triton burn-up is the 14 MeV neutron rate. In this paper, it is estimated whether an existing scintillating fibre neutron detector is also suited to measure triton burn-up in W7-X with sufficient accuracy. In this work, an estimation is presented, which can be applied to any tokamak or stellarator design and is one-dimensional in the minor radius. The inputs are profiles of density, temperature, and differential volume element as well as the triton slowing-down time. The estimation calculates the thermal deuteron fusion rate and the associated deuteron-triton fusion rate; thus, the triton burn-up generated 14 MeV neutron rate. It neither takes triton diffusion nor explicit losses into account. This thermally generated fusion rate is compared to the neutral beam injection heating induced beam-plasma fusion rate.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: EUROfusion Consortium; USDOE Office of Science (SC). Fusion Energy Sciences (FES)

Contributing Organization:: W7-X Team

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1650629

Alternate ID(s):: OSTI ID: 22976110

Report Number(s):: LA-UR--19-31604

Journal Information:: Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 8 Vol. 60; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Deuterium plasmas
Fast ion physics
Magnetic fusion energy
Neutron diagnostics
Triton burn-up
14 MeV neutrons
Scintillating fiber
Wendelstein 7-X

Estimation of 14 MeV neutron rate from triton burn-up in future W7-X deuterium plasma campaigns

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