In-out divertor flow asymmetries during ELMs in ASDEX Upgrade H-mode plasmas

M. Tsalas; D. Coster; C. Fuchs; A. Herrmann; A. Kallenbach; Hans Werner Müller; J. Neuhauser; V. Rohde; N. Tsois

doi:10.1016/j.jnucmat.2007.01.162

In-out divertor flow asymmetries during ELMs in ASDEX Upgrade H-mode plasmas

M. Tsalas (Corresponding author), D. Coster, C. Fuchs, A. Herrmann, A. Kallenbach, Hans Werner Müller, J. Neuhauser, V. Rohde, N. Tsois

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

In ASDEX Upgrade, a fast reciprocating probe positioned in the lower divertor, capable of accessing the low-field side (LFS) and high-field side (HFS) scrape-off layer (SOL) just below the x-point, as well as the private flux region, was equipped with a Mach head and used to investigate fast flow fluctuations and in-out divertor flow asymmetries during ELMs. We compare the flow behaviour during ELMs in the three separate regions. Flow enhancement is observed in the HFS SOL, with Mach number values reaching or exceeding M = 2, flow reversal in the LFS SOL, and complex fluctuating behaviour in the private flux region (which includes flow reversal). We discuss the possible mechanisms that could drive these observations.

Original language	English
Pages (from-to)	1093-1098
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	363-365
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2007.01.162
Publication status	Published - 15 Jun 2007
Externally published	Yes

Austrian Fields of Science 2012

103022 Plasma physics

Keywords

ASDEX Upgrade
Divertor diagnostic
Divertor plasma
Probes

Access to Document

10.1016/j.jnucmat.2007.01.162

Cite this

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title = "In-out divertor flow asymmetries during ELMs in ASDEX Upgrade H-mode plasmas",

abstract = "In ASDEX Upgrade, a fast reciprocating probe positioned in the lower divertor, capable of accessing the low-field side (LFS) and high-field side (HFS) scrape-off layer (SOL) just below the x-point, as well as the private flux region, was equipped with a Mach head and used to investigate fast flow fluctuations and in-out divertor flow asymmetries during ELMs. We compare the flow behaviour during ELMs in the three separate regions. Flow enhancement is observed in the HFS SOL, with Mach number values reaching or exceeding M = 2, flow reversal in the LFS SOL, and complex fluctuating behaviour in the private flux region (which includes flow reversal). We discuss the possible mechanisms that could drive these observations.",

keywords = "ASDEX Upgrade, Divertor diagnostic, Divertor plasma, Probes",

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doi = "10.1016/j.jnucmat.2007.01.162",

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T1 - In-out divertor flow asymmetries during ELMs in ASDEX Upgrade H-mode plasmas

AU - Tsalas, M.

AU - Coster, D.

AU - Fuchs, C.

AU - Herrmann, A.

AU - Kallenbach, A.

AU - Müller, Hans Werner

AU - Neuhauser, J.

AU - Rohde, V.

AU - Tsois, N.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - In ASDEX Upgrade, a fast reciprocating probe positioned in the lower divertor, capable of accessing the low-field side (LFS) and high-field side (HFS) scrape-off layer (SOL) just below the x-point, as well as the private flux region, was equipped with a Mach head and used to investigate fast flow fluctuations and in-out divertor flow asymmetries during ELMs. We compare the flow behaviour during ELMs in the three separate regions. Flow enhancement is observed in the HFS SOL, with Mach number values reaching or exceeding M = 2, flow reversal in the LFS SOL, and complex fluctuating behaviour in the private flux region (which includes flow reversal). We discuss the possible mechanisms that could drive these observations.

AB - In ASDEX Upgrade, a fast reciprocating probe positioned in the lower divertor, capable of accessing the low-field side (LFS) and high-field side (HFS) scrape-off layer (SOL) just below the x-point, as well as the private flux region, was equipped with a Mach head and used to investigate fast flow fluctuations and in-out divertor flow asymmetries during ELMs. We compare the flow behaviour during ELMs in the three separate regions. Flow enhancement is observed in the HFS SOL, with Mach number values reaching or exceeding M = 2, flow reversal in the LFS SOL, and complex fluctuating behaviour in the private flux region (which includes flow reversal). We discuss the possible mechanisms that could drive these observations.

KW - ASDEX Upgrade

KW - Divertor diagnostic

KW - Divertor plasma

KW - Probes

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ER -

In-out divertor flow asymmetries during ELMs in ASDEX Upgrade H-mode plasmas

Abstract

Austrian Fields of Science 2012

Keywords

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