Dependence of SOL widths on plasma current and density in NSTX H-mode plasmas

J. W. Ahn; R. Maingi; J. A. Boedo; V. Soukhanovskii

doi:10.1016/j.jnucmat.2009.01.110

Dependence of SOL widths on plasma current and density in NSTX H-mode plasmas

J. W. Ahn
, R. Maingi
, J. A. Boedo
, V. Soukhanovskii

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

11 Scopus citations

Abstract

The dependence of various SOL widths on the line-averaged density (over(n, -)_e) and plasma current (I_p) for the quiescent H-mode plasmas with Type-V ELMs in the National Spherical Torus Experiment (NSTX) was investigated. It is found that the heat flux SOL width (λ_q), measured by the IR camera, is virtually insensitive to over(n, -)_e and has a strong negative dependence on I_p. This insensitivity of λ_q to over(n, -) e is consistent with the scaling law from JET H-mode plasmas that shows a very weak dependence on the upstream density. The electron temperature, ion saturation current density, electron density, and electron pressure decay lengths (λ_Te, λ_jsat, λ_ne, and λ_pe, respectively) measured by the probe showed that λ_Te and λ_jsat have strong negative dependence on I_p, whereas λ_ne and λ_pe revealed only a little or no dependence. The dependence of λ_Te on I_p is consistent with the scaling law in the literature, while λ_ne and λ_pe dependence shows a different trend.

Original language	English (US)
Pages (from-to)	421-424
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.110
State	Published - Jun 15 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

Keywords

52.55.Fa

Access to Document

10.1016/j.jnucmat.2009.01.110

Cite this

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title = "Dependence of SOL widths on plasma current and density in NSTX H-mode plasmas",

abstract = "The dependence of various SOL widths on the line-averaged density (over(n, -)e) and plasma current (Ip) for the quiescent H-mode plasmas with Type-V ELMs in the National Spherical Torus Experiment (NSTX) was investigated. It is found that the heat flux SOL width (λq), measured by the IR camera, is virtually insensitive to over(n, -)e and has a strong negative dependence on Ip. This insensitivity of λq to over(n, -) e is consistent with the scaling law from JET H-mode plasmas that shows a very weak dependence on the upstream density. The electron temperature, ion saturation current density, electron density, and electron pressure decay lengths (λTe, λjsat, λne, and λpe, respectively) measured by the probe showed that λTe and λjsat have strong negative dependence on Ip, whereas λne and λpe revealed only a little or no dependence. The dependence of λTe on Ip is consistent with the scaling law in the literature, while λne and λpe dependence shows a different trend.",

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year = "2009",

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doi = "10.1016/j.jnucmat.2009.01.110",

language = "English (US)",

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T1 - Dependence of SOL widths on plasma current and density in NSTX H-mode plasmas

AU - Ahn, J. W.

AU - Maingi, R.

AU - Boedo, J. A.

AU - Soukhanovskii, V.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - The dependence of various SOL widths on the line-averaged density (over(n, -)e) and plasma current (Ip) for the quiescent H-mode plasmas with Type-V ELMs in the National Spherical Torus Experiment (NSTX) was investigated. It is found that the heat flux SOL width (λq), measured by the IR camera, is virtually insensitive to over(n, -)e and has a strong negative dependence on Ip. This insensitivity of λq to over(n, -) e is consistent with the scaling law from JET H-mode plasmas that shows a very weak dependence on the upstream density. The electron temperature, ion saturation current density, electron density, and electron pressure decay lengths (λTe, λjsat, λne, and λpe, respectively) measured by the probe showed that λTe and λjsat have strong negative dependence on Ip, whereas λne and λpe revealed only a little or no dependence. The dependence of λTe on Ip is consistent with the scaling law in the literature, while λne and λpe dependence shows a different trend.

AB - The dependence of various SOL widths on the line-averaged density (over(n, -)e) and plasma current (Ip) for the quiescent H-mode plasmas with Type-V ELMs in the National Spherical Torus Experiment (NSTX) was investigated. It is found that the heat flux SOL width (λq), measured by the IR camera, is virtually insensitive to over(n, -)e and has a strong negative dependence on Ip. This insensitivity of λq to over(n, -) e is consistent with the scaling law from JET H-mode plasmas that shows a very weak dependence on the upstream density. The electron temperature, ion saturation current density, electron density, and electron pressure decay lengths (λTe, λjsat, λne, and λpe, respectively) measured by the probe showed that λTe and λjsat have strong negative dependence on Ip, whereas λne and λpe revealed only a little or no dependence. The dependence of λTe on Ip is consistent with the scaling law in the literature, while λne and λpe dependence shows a different trend.

KW - 52.55.Fa

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DO - 10.1016/j.jnucmat.2009.01.110

M3 - Article

AN - SCOPUS:67349084097

SN - 0022-3115

VL - 390-391

SP - 421

EP - 424

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1

ER -

Dependence of SOL widths on plasma current and density in NSTX H-mode plasmas

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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