Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade

O. Linder, J. Citrin, G.M.D. (Dick) Hogeweij, C. Angioni, Clarisse Bourdelle, Francis J. Casson, E. Fable, A. Ho, Florian Koechl, M. Sertoli

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Neoclassical and turbulent heavy impurity transport in tokamak core plasmas are determined by main ion temperature, density and toroidal rotation profiles. Thus, in order to understand and prevent experimental behaviour of W accumulation, flux-driven integrated modelling of main ion heat and particle transport over multiple confinement times is a vital prerequisite. For the first time, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO. Neoclassical contributions are calculated by NCLASS; auxiliary heat and particle deposition profiles due to NBI and ECRH are prescribed from previous analysis with TRANSP. Turbulent and neoclassical contributions are insufficient in explaining main ion heat and particle transport inside the q  =  1 surface, necessitating the prescription of further transport coefficients to mimic the impact of MHD activity on central transport. The ion to electron temperature ratio at the simulation boundary at stabilizes ion scale modes while destabilizing ETG modes when significantly exceeding unity. Careful analysis of experimental measurements using Gaussian process regression techniques is carried out to explore reasonable uncertainties. In following trace W impurity transport simulations performed with additionally NEO, neoclassical transport under consideration of poloidal asymmetries alone is found to be insufficient to establish hollow central W density profiles. Reproduction of these conditions measured experimentally is found possible only when assuming the direct impact of a saturated MHD mode on heavy impurity transport.
Original languageEnglish
Article number016003
Number of pages25
JournalNuclear Fusion
Volume59
Issue number1
DOIs
Publication statusPublished - 12 Nov 2018

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tungsten
profiles
heat
impurities
ions
near Earth objects
temperature ratio
ion temperature
regression analysis
unity
hollow
simulation
transport properties
turbulence
asymmetry
electron energy
kinetics
predictions

Cite this

Linder, O., Citrin, J., Hogeweij, G. M. D. D., Angioni, C., Bourdelle, C., Casson, F. J., ... Sertoli, M. (2018). Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade. Nuclear Fusion, 59(1), [016003]. https://doi.org/10.1088/1741-4326/aae875
Linder, O. ; Citrin, J. ; Hogeweij, G.M.D. (Dick) ; Angioni, C. ; Bourdelle, Clarisse ; Casson, Francis J. ; Fable, E. ; Ho, A. ; Koechl, Florian ; Sertoli, M. / Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade. In: Nuclear Fusion. 2018 ; Vol. 59, No. 1.
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abstract = "Neoclassical and turbulent heavy impurity transport in tokamak core plasmas are determined by main ion temperature, density and toroidal rotation profiles. Thus, in order to understand and prevent experimental behaviour of W accumulation, flux-driven integrated modelling of main ion heat and particle transport over multiple confinement times is a vital prerequisite. For the first time, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO. Neoclassical contributions are calculated by NCLASS; auxiliary heat and particle deposition profiles due to NBI and ECRH are prescribed from previous analysis with TRANSP. Turbulent and neoclassical contributions are insufficient in explaining main ion heat and particle transport inside the q  =  1 surface, necessitating the prescription of further transport coefficients to mimic the impact of MHD activity on central transport. The ion to electron temperature ratio at the simulation boundary at stabilizes ion scale modes while destabilizing ETG modes when significantly exceeding unity. Careful analysis of experimental measurements using Gaussian process regression techniques is carried out to explore reasonable uncertainties. In following trace W impurity transport simulations performed with additionally NEO, neoclassical transport under consideration of poloidal asymmetries alone is found to be insufficient to establish hollow central W density profiles. Reproduction of these conditions measured experimentally is found possible only when assuming the direct impact of a saturated MHD mode on heavy impurity transport.",
author = "O. Linder and J. Citrin and Hogeweij, {G.M.D. (Dick)} and C. Angioni and Clarisse Bourdelle and Casson, {Francis J.} and E. Fable and A. Ho and Florian Koechl and M. Sertoli",
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Linder, O, Citrin, J, Hogeweij, GMDD, Angioni, C, Bourdelle, C, Casson, FJ, Fable, E, Ho, A, Koechl, F & Sertoli, M 2018, 'Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade', Nuclear Fusion, vol. 59, no. 1, 016003. https://doi.org/10.1088/1741-4326/aae875

Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade. / Linder, O.; Citrin, J.; Hogeweij, G.M.D. (Dick); Angioni, C.; Bourdelle, Clarisse; Casson, Francis J.; Fable, E.; Ho, A.; Koechl, Florian; Sertoli, M.

In: Nuclear Fusion, Vol. 59, No. 1, 016003, 12.11.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Flux-driven integrated modelling of main ion pressure and trace tungsten transport in ASDEX Upgrade

AU - Linder, O.

AU - Citrin, J.

AU - Hogeweij, G.M.D. (Dick)

AU - Angioni, C.

AU - Bourdelle, Clarisse

AU - Casson, Francis J.

AU - Fable, E.

AU - Ho, A.

AU - Koechl, Florian

AU - Sertoli, M.

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N2 - Neoclassical and turbulent heavy impurity transport in tokamak core plasmas are determined by main ion temperature, density and toroidal rotation profiles. Thus, in order to understand and prevent experimental behaviour of W accumulation, flux-driven integrated modelling of main ion heat and particle transport over multiple confinement times is a vital prerequisite. For the first time, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO. Neoclassical contributions are calculated by NCLASS; auxiliary heat and particle deposition profiles due to NBI and ECRH are prescribed from previous analysis with TRANSP. Turbulent and neoclassical contributions are insufficient in explaining main ion heat and particle transport inside the q  =  1 surface, necessitating the prescription of further transport coefficients to mimic the impact of MHD activity on central transport. The ion to electron temperature ratio at the simulation boundary at stabilizes ion scale modes while destabilizing ETG modes when significantly exceeding unity. Careful analysis of experimental measurements using Gaussian process regression techniques is carried out to explore reasonable uncertainties. In following trace W impurity transport simulations performed with additionally NEO, neoclassical transport under consideration of poloidal asymmetries alone is found to be insufficient to establish hollow central W density profiles. Reproduction of these conditions measured experimentally is found possible only when assuming the direct impact of a saturated MHD mode on heavy impurity transport.

AB - Neoclassical and turbulent heavy impurity transport in tokamak core plasmas are determined by main ion temperature, density and toroidal rotation profiles. Thus, in order to understand and prevent experimental behaviour of W accumulation, flux-driven integrated modelling of main ion heat and particle transport over multiple confinement times is a vital prerequisite. For the first time, the quasilinear gyrokinetic code QuaLiKiz is applied for successful predictions of core kinetic profiles in an ASDEX Upgrade H-mode discharge in the turbulence dominated region within the integrated modelling suite JETTO. Neoclassical contributions are calculated by NCLASS; auxiliary heat and particle deposition profiles due to NBI and ECRH are prescribed from previous analysis with TRANSP. Turbulent and neoclassical contributions are insufficient in explaining main ion heat and particle transport inside the q  =  1 surface, necessitating the prescription of further transport coefficients to mimic the impact of MHD activity on central transport. The ion to electron temperature ratio at the simulation boundary at stabilizes ion scale modes while destabilizing ETG modes when significantly exceeding unity. Careful analysis of experimental measurements using Gaussian process regression techniques is carried out to explore reasonable uncertainties. In following trace W impurity transport simulations performed with additionally NEO, neoclassical transport under consideration of poloidal asymmetries alone is found to be insufficient to establish hollow central W density profiles. Reproduction of these conditions measured experimentally is found possible only when assuming the direct impact of a saturated MHD mode on heavy impurity transport.

U2 - 10.1088/1741-4326/aae875

DO - 10.1088/1741-4326/aae875

M3 - Article

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 1

M1 - 016003

ER -