Parallel impurity dynamics in the TJ-II stellarator

J. A. Alonso; J. L. Velasco; I. Calvo; T. Estrada; J. M. Fontdecaba; J. M. García-Regaña; J. Geiger; M. Landreman; K. J. McCarthy; F. Medina; B. Ph Van Milligen; M. A. Ochando; F. I. Parra

doi:10.1088/0741-3335/58/7/074009

Parallel impurity dynamics in the TJ-II stellarator

J. A. Alonso, J. L. Velasco, I. Calvo, T. Estrada, J. M. Fontdecaba, J. M. García-Regaña, J. Geiger, M. Landreman, K. J. McCarthy, F. Medina, B. Ph Van Milligen, M. A. Ochando, F. I. Parra

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

12 Scopus citations

Abstract

We review in a tutorial fashion some of the causes of impurity density variations along field lines and radial impurity transport in the moment approach framework. An explicit and compact form of the parallel inertia force valid for arbitrary toroidal geometry and magnetic coordinates is derived and shown to be non-negligible for typical TJ-II plasma conditions. In the second part of the article, we apply the fluid model including main ion-impurity friction and inertia to observations of asymmetric emissivity patterns in neutral beam heated plasmas of the TJ-II stellarator. The model is able to explain qualitatively several features of the radiation asymmetry, both in stationary and transient conditions, based on the calculated in-surface variations of the impurity density.

Original language	English (US)
Article number	074009
Journal	Plasma Physics and Controlled Fusion
Volume	58
Issue number	7
DOIs	https://doi.org/10.1088/0741-3335/58/7/074009
State	Published - Jun 10 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

Keywords

impurity dynamics
magnetic confinement fusion
plasma fluid dynamics
stellarators

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10.1088/0741-3335/58/7/074009

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Alonso, J. A., Velasco, J. L., Calvo, I., Estrada, T., Fontdecaba, J. M., García-Regaña, J. M., Geiger, J., Landreman, M., McCarthy, K. J., Medina, F., Van Milligen, B. P., Ochando, M. A., & Parra, F. I. (2016). Parallel impurity dynamics in the TJ-II stellarator. Plasma Physics and Controlled Fusion, 58(7), Article 074009. https://doi.org/10.1088/0741-3335/58/7/074009

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title = "Parallel impurity dynamics in the TJ-II stellarator",

abstract = "We review in a tutorial fashion some of the causes of impurity density variations along field lines and radial impurity transport in the moment approach framework. An explicit and compact form of the parallel inertia force valid for arbitrary toroidal geometry and magnetic coordinates is derived and shown to be non-negligible for typical TJ-II plasma conditions. In the second part of the article, we apply the fluid model including main ion-impurity friction and inertia to observations of asymmetric emissivity patterns in neutral beam heated plasmas of the TJ-II stellarator. The model is able to explain qualitatively several features of the radiation asymmetry, both in stationary and transient conditions, based on the calculated in-surface variations of the impurity density.",

keywords = "impurity dynamics, magnetic confinement fusion, plasma fluid dynamics, stellarators",

author = "Alonso, {J. A.} and Velasco, {J. L.} and I. Calvo and T. Estrada and Fontdecaba, {J. M.} and Garc{\'i}a-Rega{\~n}a, {J. M.} and J. Geiger and M. Landreman and McCarthy, {K. J.} and F. Medina and {Van Milligen}, {B. Ph} and Ochando, {M. A.} and Parra, {F. I.}",

note = "Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

year = "2016",

month = jun,

day = "10",

doi = "10.1088/0741-3335/58/7/074009",

language = "English (US)",

volume = "58",

journal = "Plasma Physics and Controlled Fusion",

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TY - JOUR

T1 - Parallel impurity dynamics in the TJ-II stellarator

AU - Alonso, J. A.

AU - Velasco, J. L.

AU - Calvo, I.

AU - Estrada, T.

AU - Fontdecaba, J. M.

AU - García-Regaña, J. M.

AU - Geiger, J.

AU - Landreman, M.

AU - McCarthy, K. J.

AU - Medina, F.

AU - Van Milligen, B. Ph

AU - Ochando, M. A.

AU - Parra, F. I.

PY - 2016/6/10

Y1 - 2016/6/10

N2 - We review in a tutorial fashion some of the causes of impurity density variations along field lines and radial impurity transport in the moment approach framework. An explicit and compact form of the parallel inertia force valid for arbitrary toroidal geometry and magnetic coordinates is derived and shown to be non-negligible for typical TJ-II plasma conditions. In the second part of the article, we apply the fluid model including main ion-impurity friction and inertia to observations of asymmetric emissivity patterns in neutral beam heated plasmas of the TJ-II stellarator. The model is able to explain qualitatively several features of the radiation asymmetry, both in stationary and transient conditions, based on the calculated in-surface variations of the impurity density.

AB - We review in a tutorial fashion some of the causes of impurity density variations along field lines and radial impurity transport in the moment approach framework. An explicit and compact form of the parallel inertia force valid for arbitrary toroidal geometry and magnetic coordinates is derived and shown to be non-negligible for typical TJ-II plasma conditions. In the second part of the article, we apply the fluid model including main ion-impurity friction and inertia to observations of asymmetric emissivity patterns in neutral beam heated plasmas of the TJ-II stellarator. The model is able to explain qualitatively several features of the radiation asymmetry, both in stationary and transient conditions, based on the calculated in-surface variations of the impurity density.

KW - impurity dynamics

KW - magnetic confinement fusion

KW - plasma fluid dynamics

KW - stellarators

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UR - http://www.scopus.com/inward/citedby.url?scp=84976291172&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/58/7/074009

DO - 10.1088/0741-3335/58/7/074009

M3 - Article

AN - SCOPUS:84976291172

SN - 0741-3335

VL - 58

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 7

M1 - 074009

ER -

Parallel impurity dynamics in the TJ-II stellarator

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