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 journalArticleScientificpeer-review

3 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 languageEnglish
Article number095029
JournalPlasma Physics and Controlled Fusion
Volume56
Issue number9
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

tracers
Methane
methane
dissociation
Impurities
Nitrogen
Plasmas
nitrogen
impurities
Molecules
molecules
injection
Plasma heating
Plasma confinement
plasma layers
plasma heating
Plasma density
Ions
plasma density
ions

Keywords

  • fusion energy
  • plasma physics
  • impurities
  • methane
  • nitrogen
  • dissociation
  • deposition

Cite this

Miettunen, J. ; Airila, Markus ; Makkonen, T. ; Groth, M. ; Lindholm, V. ; Björkas, C. ; Hakola, Antti ; Müller, H.W. ; Team, ASDEX Upgrade. / Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma. In: Plasma Physics and Controlled Fusion. 2014 ; Vol. 56, No. 9.
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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.",
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Dissociation of methane and nitrogen molecules and global transport of tracer impurities in an ASDEX Upgrade L-mode plasma. / Miettunen, J. (Corresponding Author); Airila, Markus; Makkonen, T.; Groth, M.; Lindholm, V.; Björkas, C.; Hakola, Antti; Müller, H.W.; Team, ASDEX Upgrade.

In: Plasma Physics and Controlled Fusion, Vol. 56, No. 9, 095029, 2014.

Research output: Contribution to journalArticleScientificpeer-review

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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 - Team, ASDEX Upgrade

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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.

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KW - plasma physics

KW - impurities

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KW - nitrogen

KW - dissociation

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

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