Diagnosis of edge localized mode evolution in DIII-D using fast-gated CID and infrared cameras

Groth, M.; Fenstermacher, M.E.; Lasnier, C.J.; Hernández, R.; Moller, J.M.; Sturz, Richard A.

doi:10.1063/1.1537037

Cited by 17 publications

(13 citation statements)

References 5 publications

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“…These variations produced a series of divertor solutions for each density case, ranging from high electron temperature at both inboard and outboard targets to an inboard divertor plasma with <5 eV electron temperature very near the X-point. These divertor solutions were compared to tangential camera images that were inverted into poloidal profiles of D a and CIII emission [10]. The CIII emission usually peaks at 8-10 eV and is thus a good marker of where neutral deuterium ionization path lengths become shorter.…”

Section: Analysis Approachmentioning

confidence: 99%

Pedestal fueling through interpretive analysis of measured main chamber and divertor target flux in DIII-D

Leonard

Groth

Porter

et al. 2009

Journal of Nuclear Materials

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Section: Analysis Approachmentioning

confidence: 99%

Pedestal fueling through interpretive analysis of measured main chamber and divertor target flux in DIII-D

Leonard

Groth

Porter

et al. 2009

Journal of Nuclear Materials

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“…Multiple edge diagnostics were used to measure the 2D neutral particle (D a ) and carbon ion (CII/CIII) emission distribution in both the divertor and main diagnostic chamber region. The main tool of this paper is tangentially viewing charge injection device (CID) cameras [4,5], from which time-averaged 2D poloidal D a , CII (514 nm), and CIII (465 nm) distribution profiles were inferred, covering approximately 85% of the DIII-D poloidal cross-section ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the poloidal distribution of core plasma fueling and impurity sources in DIII-D

Groth

Owen

Porter

et al. 2005

Journal of Nuclear Materials

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Measurements and modeling of the 2D poloidal D a intensity distribution in DIII-D low density L-mode and medium density ELMy H-mode plasmas indicate that the core plasma is predominately fueled near the divertor X-point region. The neutral deuterium and ion carbon emission were measured in the divertor and inner main chamber scrape-off layer (SOL) using a plasma imaging technique, covering 85% of the poloidal cross-section. Typically, the peak emission in the inner main SOL at the tokamak midplane was three orders of magnitude lower than in the divertor. For discharges with the ion B · $B drift direction toward the lower divertor the UEDGE/DEGAS codes predict strong core plasma fueling from the significantly higher density and lower temperature plasma calculated in the inner divertor leg. The concomitant carbon ion flow reversal in the inner divertor leg enhances the leakage of carbon from the divertor into the main SOL, and hence into the core.

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“…8) [64] also showed the development of a poloidally localized density "finger" that breaks away from the pedestal during the ELM crash. Finally, CIII (465 nm) visible emission data from a tangentially viewing fastgated camera [65] at the midplane (Fig. 9), showed multiple filaments extended along the SOL flux surfaces.…”

Section: Elm Dynamics In the Pedestal And Midplane Solmentioning

confidence: 99%

Structure, stability and ELM dynamics of the H-mode pedestal in DIII-D

Fenstermacher

Osborne²,

Leonard³

et al. 2005

Nucl. Fusion

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ABSTRACT. Experiments are described that have increased understanding of the transport and stability physics that set the H-mode edge pedestal width and height, determine the onset of Type-I edge localized modes (ELMs), and produce the nonlinear dynamics of the ELM perturbation in the pedestal and scrape-off layer (SOL). Models now exist for the n e pedestal profile and the p e height at the onset of Type-I ELMs, and progress has been made toward models of the T e pedestal width and nonlinear ELM evolution. Similarity experiments between DIII-D and JET suggested that neutral penetration physics plays an important role in the relationship between the width and height of the n e pedestal. Plasma physics appears to dominate in setting the T e pedestal width. Measured pedestal conditions including edge current at ELM onset agree with intermediate-n peeling-ballooning (P-B)

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Diagnosis of edge localized mode evolution in DIII-D using fast-gated CID and infrared cameras

Cited by 17 publications

References 5 publications

Pedestal fueling through interpretive analysis of measured main chamber and divertor target flux in DIII-D

Pedestal fueling through interpretive analysis of measured main chamber and divertor target flux in DIII-D

Assessment of the poloidal distribution of core plasma fueling and impurity sources in DIII-D

Structure, stability and ELM dynamics of the H-mode pedestal in DIII-D

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