Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET

Leena Aho-Mantila, G. Conway, H.W. Müller, S. Potzel, D. Coster, M. Wischmeier, A. Meigs, M. Stamp

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Numerical simulations of divertor power and particle fluxes in L-mode exhaust scenarios are presented, in comparison to experiments in the full-metal devices ASDEX Upgrade and JET. The simulations are performed using the plasma fluid – Monte Carlo neutrals code package SOLPS5.0, with cross-field drift terms activated. We present a validation of the simulation results against dedicated benchmark experiments with and without nitrogen seeding and discuss the effect of drifts on the modelled divertor asymmetries. At low power dissipation levels, asymmetric divertor conditions are obtained in the simulations as a result of E × B drifts, and the modelled volume distributions of particles and energy are largely confirmed by the multiple experimental measurements in both devices. In high-recycling conditions close to the roll-over of the ion fluxes at the target plates, the measured ion fluxes exceed the simulated levels by up to a factor of 6. The discrepancy between the modelled and measured target ion flux evolution is stronger when the divertor conditions are controlled by increasing the deuterium fuelling, in comparison to increasing the impurity-seeding level at constant line-averaged density.
Original languageEnglish
Title of host publication25th IAEA Fusion Energy Conference
Subtitle of host publicationProgramme, Book of Abstracts, and Linked Contributions
PublisherInternational Atomic Energy Agency IAEA
PagesTH/3-3
Number of pages8
Publication statusPublished - 2015
MoE publication typeB3 Non-refereed article in conference proceedings
Event25th Fusion Energy Conference, IAEA FEC 2014 - St.Petersburg, Russian Federation
Duration: 13 Oct 201418 Oct 2014
http://www-naweb.iaea.org/napc/physics/FEC/FEC2014/fec_sourcebook_online.pdf (Full proceedings)

Conference

Conference25th Fusion Energy Conference, IAEA FEC 2014
Abbreviated titleIAEA FEC 2014
CountryRussian Federation
CitySt.Petersburg
Period13/10/1418/10/14
Internet address

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inoculation
simulation
ions
refueling
recycling
flux (rate)
deuterium
dissipation
asymmetry
nitrogen
impurities
fluids
metals
energy

Cite this

Aho-Mantila, L., Conway, G., Müller, H. W., Potzel, S., Coster, D., Wischmeier, M., ... Stamp, M. (2015). Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET. In 25th IAEA Fusion Energy Conference: Programme, Book of Abstracts, and Linked Contributions (pp. TH/3-3). International Atomic Energy Agency IAEA.
Aho-Mantila, Leena ; Conway, G. ; Müller, H.W. ; Potzel, S. ; Coster, D. ; Wischmeier, M. ; Meigs, A. ; Stamp, M. / Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET. 25th IAEA Fusion Energy Conference: Programme, Book of Abstracts, and Linked Contributions. International Atomic Energy Agency IAEA, 2015. pp. TH/3-3
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title = "Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET",
abstract = "Numerical simulations of divertor power and particle fluxes in L-mode exhaust scenarios are presented, in comparison to experiments in the full-metal devices ASDEX Upgrade and JET. The simulations are performed using the plasma fluid – Monte Carlo neutrals code package SOLPS5.0, with cross-field drift terms activated. We present a validation of the simulation results against dedicated benchmark experiments with and without nitrogen seeding and discuss the effect of drifts on the modelled divertor asymmetries. At low power dissipation levels, asymmetric divertor conditions are obtained in the simulations as a result of E × B drifts, and the modelled volume distributions of particles and energy are largely confirmed by the multiple experimental measurements in both devices. In high-recycling conditions close to the roll-over of the ion fluxes at the target plates, the measured ion fluxes exceed the simulated levels by up to a factor of 6. The discrepancy between the modelled and measured target ion flux evolution is stronger when the divertor conditions are controlled by increasing the deuterium fuelling, in comparison to increasing the impurity-seeding level at constant line-averaged density.",
author = "Leena Aho-Mantila and G. Conway and H.W. M{\"u}ller and S. Potzel and D. Coster and M. Wischmeier and A. Meigs and M. Stamp",
note = "HUO: Poster presentation, abstracts reviewed",
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language = "English",
pages = "TH/3--3",
booktitle = "25th IAEA Fusion Energy Conference",
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Aho-Mantila, L, Conway, G, Müller, HW, Potzel, S, Coster, D, Wischmeier, M, Meigs, A & Stamp, M 2015, Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET. in 25th IAEA Fusion Energy Conference: Programme, Book of Abstracts, and Linked Contributions. International Atomic Energy Agency IAEA, pp. TH/3-3, 25th Fusion Energy Conference, IAEA FEC 2014, St.Petersburg, Russian Federation, 13/10/14.

Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET. / Aho-Mantila, Leena; Conway, G.; Müller, H.W.; Potzel, S.; Coster, D.; Wischmeier, M.; Meigs, A.; Stamp, M.

25th IAEA Fusion Energy Conference: Programme, Book of Abstracts, and Linked Contributions. International Atomic Energy Agency IAEA, 2015. p. TH/3-3.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET

AU - Aho-Mantila, Leena

AU - Conway, G.

AU - Müller, H.W.

AU - Potzel, S.

AU - Coster, D.

AU - Wischmeier, M.

AU - Meigs, A.

AU - Stamp, M.

N1 - HUO: Poster presentation, abstracts reviewed

PY - 2015

Y1 - 2015

N2 - Numerical simulations of divertor power and particle fluxes in L-mode exhaust scenarios are presented, in comparison to experiments in the full-metal devices ASDEX Upgrade and JET. The simulations are performed using the plasma fluid – Monte Carlo neutrals code package SOLPS5.0, with cross-field drift terms activated. We present a validation of the simulation results against dedicated benchmark experiments with and without nitrogen seeding and discuss the effect of drifts on the modelled divertor asymmetries. At low power dissipation levels, asymmetric divertor conditions are obtained in the simulations as a result of E × B drifts, and the modelled volume distributions of particles and energy are largely confirmed by the multiple experimental measurements in both devices. In high-recycling conditions close to the roll-over of the ion fluxes at the target plates, the measured ion fluxes exceed the simulated levels by up to a factor of 6. The discrepancy between the modelled and measured target ion flux evolution is stronger when the divertor conditions are controlled by increasing the deuterium fuelling, in comparison to increasing the impurity-seeding level at constant line-averaged density.

AB - Numerical simulations of divertor power and particle fluxes in L-mode exhaust scenarios are presented, in comparison to experiments in the full-metal devices ASDEX Upgrade and JET. The simulations are performed using the plasma fluid – Monte Carlo neutrals code package SOLPS5.0, with cross-field drift terms activated. We present a validation of the simulation results against dedicated benchmark experiments with and without nitrogen seeding and discuss the effect of drifts on the modelled divertor asymmetries. At low power dissipation levels, asymmetric divertor conditions are obtained in the simulations as a result of E × B drifts, and the modelled volume distributions of particles and energy are largely confirmed by the multiple experimental measurements in both devices. In high-recycling conditions close to the roll-over of the ion fluxes at the target plates, the measured ion fluxes exceed the simulated levels by up to a factor of 6. The discrepancy between the modelled and measured target ion flux evolution is stronger when the divertor conditions are controlled by increasing the deuterium fuelling, in comparison to increasing the impurity-seeding level at constant line-averaged density.

M3 - Conference article in proceedings

SP - TH/3-3

BT - 25th IAEA Fusion Energy Conference

PB - International Atomic Energy Agency IAEA

ER -

Aho-Mantila L, Conway G, Müller HW, Potzel S, Coster D, Wischmeier M et al. Assessment of scrape-off layer simulations with drifts against L-mode experiments in ASDEX upgrade and JET. In 25th IAEA Fusion Energy Conference: Programme, Book of Abstracts, and Linked Contributions. International Atomic Energy Agency IAEA. 2015. p. TH/3-3