Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

J. Miettunen; Markus Airila; T. Makkonen; M. Groth; V. Lindholm; C. Björkas; Antti Hakola; H.W. Müller; ASDEX Upgrade Team

doi:10.1088/0741-3335/56/9/095029

Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

J. Miettunen (Corresponding Author), Markus Airila, T. Makkonen, M. Groth, V. Lindholm, C. Björkas, Antti Hakola, H.W. Müller, ASDEX Upgrade Team

Research output: Contribution to journal › Article › Scientific › peer-review

4 Citations (Scopus)

Abstract

We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.

Original language	English
Article number	095029
Journal	Plasma Physics and Controlled Fusion
Volume	56
Issue number	9
DOIs	https://doi.org/10.1088/0741-3335/56/9/095029
Publication status	Published - 2014
MoE publication type	A1 Journal article-refereed

Keywords

fusion energy
plasma physics
impurities
methane
nitrogen
dissociation
deposition

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/0741-3335/56/9/095029

Cite this

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title = "Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma",

abstract = "We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.",

keywords = "fusion energy, plasma physics, impurities, methane, nitrogen, dissociation, deposition",

author = "J. Miettunen and Markus Airila and T. Makkonen and M. Groth and V. Lindholm and C. Bj{\"o}rkas and Antti Hakola and H.W. M{\"u}ller and {ASDEX Upgrade Team}",

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T1 - Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

AU - Miettunen, J.

AU - Airila, Markus

AU - Makkonen, T.

AU - Groth, M.

AU - Lindholm, V.

AU - Björkas, C.

AU - Hakola, Antti

AU - Müller, H.W.

AU - ASDEX Upgrade Team

PY - 2014

Y1 - 2014

N2 - We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.

AB - We model the dissociation of injected methane (13CH4) and nitrogen (15N2) molecules and the subsequent transport of tracer ions in ASDEX Upgrade (AUG) low confinement (L-mode) plasma conditions resembling a tracer injection experiment conducted in 2011. Based on simulations with the ERO code, the dissociation is predicted to occur relatively close to the injection port in the far-scrape-off layer (far-SOL) plasma with the dissociation location moving closer to the injection location with increasing plasma density and heating power. Simulations of global transport of the tracer ions resulting from the dissociation using the ASCOT code predict that the decreasing penetration depth of the molecules (dissociation in the far-SOL) increases the ratio between main chamber and divertor deposition.

KW - fusion energy

KW - plasma physics

KW - impurities

KW - methane

KW - nitrogen

KW - dissociation

KW - deposition

U2 - 10.1088/0741-3335/56/9/095029

DO - 10.1088/0741-3335/56/9/095029

M3 - Article

SN - 0741-3335

VL - 56

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 9

M1 - 095029

ER -

Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma

Abstract

Keywords

UN SDGs

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