The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade: Letter

J. Miettunen (Corresponding Author), T. Kurki-Suonio, T. Makkonen, M. Groth, Antti Hakola, E. Hirvijoki, K. Krieger, Jari Likonen, S. Äkäslompolo, ASDEX Upgrade Team

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Abstract

We present the first results of 3D simulations of global 13C transport in ASDEX Upgrade (AUG) indicating that the deposition profile of 13C exhibits toroidal asymmetry in the main chamber. In 2007, the migration of carbon in AUG was studied with a methane (13CH4) injection experiment (A. Hakola et al and the ASDEX Upgrade Team 2010 Plasma Phys. Control. Fusion 52 065006). The total amount of deposited 13C was estimated by assuming toroidally symmetric deposition. Remarkably, the total number of deposited atoms was observed to be less than 10% of the number of injected atoms. The experiment has been simulated with the 3D orbit-following Monte Carlo code ASCOT using both a realistic 3D wall geometry of AUG and a 3D magnetic field with toroidal ripple. The simulations indicate that the non-axisymmetric wall geometry causes notable toroidal asymmetry in the deposition profile in the outer (low-field side) midplane region which can provide a partial explanation for the missing carbon inferred from post-mortem analysis of 13C deposition.

Original languageEnglish
Article number032001
Number of pages6
JournalNuclear Fusion
Volume52
Issue number3
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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geometry
asymmetry
carbon
profiles
ripples
atoms
methane
simulation
fusion
chambers
injection
orbits
causes
magnetic fields

Cite this

Miettunen, J., Kurki-Suonio, T., Makkonen, T., Groth, M., Hakola, A., Hirvijoki, E., ... ASDEX Upgrade Team (2012). The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade: Letter. Nuclear Fusion, 52(3), [032001]. https://doi.org/10.1088/0029-5515/52/3/032001
Miettunen, J. ; Kurki-Suonio, T. ; Makkonen, T. ; Groth, M. ; Hakola, Antti ; Hirvijoki, E. ; Krieger, K. ; Likonen, Jari ; Äkäslompolo, S. ; ASDEX Upgrade Team. / The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade : Letter. In: Nuclear Fusion. 2012 ; Vol. 52, No. 3.
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abstract = "We present the first results of 3D simulations of global 13C transport in ASDEX Upgrade (AUG) indicating that the deposition profile of 13C exhibits toroidal asymmetry in the main chamber. In 2007, the migration of carbon in AUG was studied with a methane (13CH4) injection experiment (A. Hakola et al and the ASDEX Upgrade Team 2010 Plasma Phys. Control. Fusion 52 065006). The total amount of deposited 13C was estimated by assuming toroidally symmetric deposition. Remarkably, the total number of deposited atoms was observed to be less than 10{\%} of the number of injected atoms. The experiment has been simulated with the 3D orbit-following Monte Carlo code ASCOT using both a realistic 3D wall geometry of AUG and a 3D magnetic field with toroidal ripple. The simulations indicate that the non-axisymmetric wall geometry causes notable toroidal asymmetry in the deposition profile in the outer (low-field side) midplane region which can provide a partial explanation for the missing carbon inferred from post-mortem analysis of 13C deposition.",
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Miettunen, J, Kurki-Suonio, T, Makkonen, T, Groth, M, Hakola, A, Hirvijoki, E, Krieger, K, Likonen, J, Äkäslompolo, S & ASDEX Upgrade Team 2012, 'The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade: Letter', Nuclear Fusion, vol. 52, no. 3, 032001. https://doi.org/10.1088/0029-5515/52/3/032001

The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade : Letter. / Miettunen, J. (Corresponding Author); Kurki-Suonio, T.; Makkonen, T.; Groth, M.; Hakola, Antti; Hirvijoki, E.; Krieger, K.; Likonen, Jari; Äkäslompolo, S.; ASDEX Upgrade Team.

In: Nuclear Fusion, Vol. 52, No. 3, 032001, 2012.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - The effect of non-axisymmetric wall geometry on 13C transport in ASDEX Upgrade

T2 - Letter

AU - Miettunen, J.

AU - Kurki-Suonio, T.

AU - Makkonen, T.

AU - Groth, M.

AU - Hakola, Antti

AU - Hirvijoki, E.

AU - Krieger, K.

AU - Likonen, Jari

AU - Äkäslompolo, S.

AU - ASDEX Upgrade Team

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AB - We present the first results of 3D simulations of global 13C transport in ASDEX Upgrade (AUG) indicating that the deposition profile of 13C exhibits toroidal asymmetry in the main chamber. In 2007, the migration of carbon in AUG was studied with a methane (13CH4) injection experiment (A. Hakola et al and the ASDEX Upgrade Team 2010 Plasma Phys. Control. Fusion 52 065006). The total amount of deposited 13C was estimated by assuming toroidally symmetric deposition. Remarkably, the total number of deposited atoms was observed to be less than 10% of the number of injected atoms. The experiment has been simulated with the 3D orbit-following Monte Carlo code ASCOT using both a realistic 3D wall geometry of AUG and a 3D magnetic field with toroidal ripple. The simulations indicate that the non-axisymmetric wall geometry causes notable toroidal asymmetry in the deposition profile in the outer (low-field side) midplane region which can provide a partial explanation for the missing carbon inferred from post-mortem analysis of 13C deposition.

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