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

J. Miettunen; T. Kurki-Suonio; T. Makkonen; M. Groth; Antti Hakola; E. Hirvijoki; K. Krieger; Jari Likonen; S. Äkäslompolo; ASDEX Upgrade Team

doi:10.1088/0029-5515/52/3/032001

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 language	English
Article number	032001
Number of pages	6
Journal	Nuclear Fusion
Volume	52
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/52/3/032001
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

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@article{203391d0dead4053a1d173e9a51b1c2e,

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

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.",

author = "J. Miettunen and T. Kurki-Suonio and T. Makkonen and M. Groth and Antti Hakola and E. Hirvijoki and K. Krieger and Jari Likonen and S. {\"A}k{\"a}slompolo and {ASDEX Upgrade Team}",

year = "2012",

doi = "10.1088/0029-5515/52/3/032001",

language = "English",

volume = "52",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "Institute of Physics IOP",

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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

PY - 2012

Y1 - 2012

N2 - 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.

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.

U2 - 10.1088/0029-5515/52/3/032001

DO - 10.1088/0029-5515/52/3/032001

M3 - Article

SN - 0029-5515

VL - 52

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

M1 - 032001

ER -

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

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