Observation of non-Maxwellian electron distributions in the NSTX divertor

M. A. Jaworski; M. G. Bell; T. K. Gray; R. Kaita; I. Kaganovich; J. Kallman; H. W. Kugel; B. LeBlanc; A. G. McLean; S. A. Sabbagh; F. Scotti; V. A. Soukhanovskii; D. P. Stotler

doi:10.1016/j.jnucmat.2013.01.076

Observation of non-Maxwellian electron distributions in the NSTX divertor

M. A. Jaworski
, M. G. Bell
, T. K. Gray
, R. Kaita
, I. Kaganovich
, J. Kallman
, H. W. Kugel
, B. LeBlanc
, A. G. McLean
, S. A. Sabbagh
, F. Scotti
, V. A. Soukhanovskii
, D. P. Stotler

Power Exhaust and Particle Control

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

20 Scopus citations

Abstract

The scrape-off layer plasma at the tokamak region is characterized by open field lines and often contains large variations in plasma properties along these field-lines. Proper characterization of local plasma conditions is critical to assessing plasma-material interaction processes occurring at the target. Langmuir probes are frequently employed in tokamak divertors but are challenging to interpretation. A kinetic interpretation for Langmuir probes in NSTX has yielded non-Maxwellian electron distributions in the divertor characterized by cool bulk populations and energetic tail populations with temperatures of 2-4 times the bulk. Spectroscopic analysis and modeling confirms the bulk plasma temperature and density which can only be obtained with the kinetic interpretation.

Original language	English
Pages (from-to)	S384-S387
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.076
State	Published - 2013

Funding

The authors thank the reviewers for comments that have generally improve the quality of this manuscript. This work is supported under the U.S. Department of Energy contract #DE-AC02-09CHI1466.

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10.1016/j.jnucmat.2013.01.076

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Jaworski, M. A., Bell, M. G., Gray, T. K., Kaita, R., Kaganovich, I., Kallman, J., Kugel, H. W., LeBlanc, B., McLean, A. G., Sabbagh, S. A., Scotti, F., Soukhanovskii, V. A., & Stotler, D. P. (2013). Observation of non-Maxwellian electron distributions in the NSTX divertor. Journal of Nuclear Materials, 438(SUPPL), S384-S387. https://doi.org/10.1016/j.jnucmat.2013.01.076

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title = "Observation of non-Maxwellian electron distributions in the NSTX divertor",

abstract = "The scrape-off layer plasma at the tokamak region is characterized by open field lines and often contains large variations in plasma properties along these field-lines. Proper characterization of local plasma conditions is critical to assessing plasma-material interaction processes occurring at the target. Langmuir probes are frequently employed in tokamak divertors but are challenging to interpretation. A kinetic interpretation for Langmuir probes in NSTX has yielded non-Maxwellian electron distributions in the divertor characterized by cool bulk populations and energetic tail populations with temperatures of 2-4 times the bulk. Spectroscopic analysis and modeling confirms the bulk plasma temperature and density which can only be obtained with the kinetic interpretation.",

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doi = "10.1016/j.jnucmat.2013.01.076",

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AU - Jaworski, M. A.

AU - Bell, M. G.

AU - Gray, T. K.

AU - Kaita, R.

AU - Kaganovich, I.

AU - Kallman, J.

AU - Kugel, H. W.

AU - LeBlanc, B.

AU - McLean, A. G.

AU - Sabbagh, S. A.

AU - Scotti, F.

AU - Soukhanovskii, V. A.

AU - Stotler, D. P.

PY - 2013

Y1 - 2013

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AB - The scrape-off layer plasma at the tokamak region is characterized by open field lines and often contains large variations in plasma properties along these field-lines. Proper characterization of local plasma conditions is critical to assessing plasma-material interaction processes occurring at the target. Langmuir probes are frequently employed in tokamak divertors but are challenging to interpretation. A kinetic interpretation for Langmuir probes in NSTX has yielded non-Maxwellian electron distributions in the divertor characterized by cool bulk populations and energetic tail populations with temperatures of 2-4 times the bulk. Spectroscopic analysis and modeling confirms the bulk plasma temperature and density which can only be obtained with the kinetic interpretation.

UR - https://www.scopus.com/pages/publications/84885468869

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DO - 10.1016/j.jnucmat.2013.01.076

M3 - Article

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VL - 438

SP - S384-S387

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL

ER -

Observation of non-Maxwellian electron distributions in the NSTX divertor

Abstract

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