MARFE stability and movement in an ELMy H-mode NSTX discharge

F. Kelly; R. Maingi; R. Maqueda; J. Menard; S. Paul

doi:10.1016/j.jnucmat.2009.01.122

MARFE stability and movement in an ELMy H-mode NSTX discharge

F. Kelly, R. Maingi, R. Maqueda, J. Menard, S. Paul

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

8 Scopus citations

Abstract

The results of a comparison of Multifaceted Asymmetric Radiation From the Edge (MARFE) theory with experiment in the National Spherical Torus Experiment (NSTX) are presented. A variety of MARFE behavior was observed using a fast-framing camera. A basic MARFE theory was applied to NSTX Multi-Pulse Thomson Scattering (MPTS) and Charge-Exchange Recombination Spectroscopy (CHERS) data. MARFE theory showed some limited agreement with experiment, but uncertainty in the separatrix location constrained the analysis. A method based on shifting iso-T_e flux surfaces was used to estimate the separatrix location. The movements of MARFEs in NSTX are interpreted to result from diamagnetic heat flux driven drifts relative to the E × B drift and imply slowing edge poloidal rotation and/or changing edge profiles before a large ELM.

Original language	English (US)
Pages (from-to)	436-439
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.122
State	Published - Jun 15 2009

All Science Journal Classification (ASJC) codes

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

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10.1016/j.jnucmat.2009.01.122

Cite this

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title = "MARFE stability and movement in an ELMy H-mode NSTX discharge",

abstract = "The results of a comparison of Multifaceted Asymmetric Radiation From the Edge (MARFE) theory with experiment in the National Spherical Torus Experiment (NSTX) are presented. A variety of MARFE behavior was observed using a fast-framing camera. A basic MARFE theory was applied to NSTX Multi-Pulse Thomson Scattering (MPTS) and Charge-Exchange Recombination Spectroscopy (CHERS) data. MARFE theory showed some limited agreement with experiment, but uncertainty in the separatrix location constrained the analysis. A method based on shifting iso-Te flux surfaces was used to estimate the separatrix location. The movements of MARFEs in NSTX are interpreted to result from diamagnetic heat flux driven drifts relative to the E × B drift and imply slowing edge poloidal rotation and/or changing edge profiles before a large ELM.",

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T1 - MARFE stability and movement in an ELMy H-mode NSTX discharge

AU - Kelly, F.

AU - Maingi, R.

AU - Maqueda, R.

AU - Menard, J.

AU - Paul, S.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - The results of a comparison of Multifaceted Asymmetric Radiation From the Edge (MARFE) theory with experiment in the National Spherical Torus Experiment (NSTX) are presented. A variety of MARFE behavior was observed using a fast-framing camera. A basic MARFE theory was applied to NSTX Multi-Pulse Thomson Scattering (MPTS) and Charge-Exchange Recombination Spectroscopy (CHERS) data. MARFE theory showed some limited agreement with experiment, but uncertainty in the separatrix location constrained the analysis. A method based on shifting iso-Te flux surfaces was used to estimate the separatrix location. The movements of MARFEs in NSTX are interpreted to result from diamagnetic heat flux driven drifts relative to the E × B drift and imply slowing edge poloidal rotation and/or changing edge profiles before a large ELM.

AB - The results of a comparison of Multifaceted Asymmetric Radiation From the Edge (MARFE) theory with experiment in the National Spherical Torus Experiment (NSTX) are presented. A variety of MARFE behavior was observed using a fast-framing camera. A basic MARFE theory was applied to NSTX Multi-Pulse Thomson Scattering (MPTS) and Charge-Exchange Recombination Spectroscopy (CHERS) data. MARFE theory showed some limited agreement with experiment, but uncertainty in the separatrix location constrained the analysis. A method based on shifting iso-Te flux surfaces was used to estimate the separatrix location. The movements of MARFEs in NSTX are interpreted to result from diamagnetic heat flux driven drifts relative to the E × B drift and imply slowing edge poloidal rotation and/or changing edge profiles before a large ELM.

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EP - 439

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

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ER -

MARFE stability and movement in an ELMy H-mode NSTX discharge

Abstract

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