Structure of MARFEs and ELMs in NSTX

R. J. Maqueda; R. Maingi; K. Tritz; K. C. Lee; C. E. Bush; E. D. Fredrickson; J. E. Menard; A. L. Roquemore; S. A. Sabbagh; S. J. Zweben

doi:10.1016/j.jnucmat.2007.01.166

Structure of MARFEs and ELMs in NSTX

R. J. Maqueda
, R. Maingi
, K. Tritz
, K. C. Lee
, C. E. Bush
, E. D. Fredrickson
, J. E. Menard
, A. L. Roquemore
, S. A. Sabbagh
, S. J. Zweben

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

13 Scopus citations

Abstract

The fast-evolving structure of MARFEs and ELMs is observed in the National Spherical Torus Experiment (NSTX) using a fast-framing camera. It is shown that Type V ELMs, the small ELM regime in NSTX, is characterized by a poloidally propagating ionization front close to the separatrix position. The ELMs also interact with the main chamber MARFE observed in NSTX coupling its movement and partial burn-through with that of the ELM cycle. During this cycle a toroidally localized MARFE precursor is seen propagating upward along field lines at speed of the order of 15 km/s. This interaction between ELM activity and MARFEs may be responsible for slow heat pulse propagation speeds seen in the divertor region.

Original language	English (US)
Pages (from-to)	1000-1005
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	363-365
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2007.01.166
State	Published - Jun 15 2007

All Science Journal Classification (ASJC) codes

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

Keywords

ELM
MARFE
NSTX
Visible imaging

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10.1016/j.jnucmat.2007.01.166

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@article{277d2894bf494c39a88bb1d9c4729697,

title = "Structure of MARFEs and ELMs in NSTX",

abstract = "The fast-evolving structure of MARFEs and ELMs is observed in the National Spherical Torus Experiment (NSTX) using a fast-framing camera. It is shown that Type V ELMs, the small ELM regime in NSTX, is characterized by a poloidally propagating ionization front close to the separatrix position. The ELMs also interact with the main chamber MARFE observed in NSTX coupling its movement and partial burn-through with that of the ELM cycle. During this cycle a toroidally localized MARFE precursor is seen propagating upward along field lines at speed of the order of 15 km/s. This interaction between ELM activity and MARFEs may be responsible for slow heat pulse propagation speeds seen in the divertor region.",

keywords = "ELM, MARFE, NSTX, Visible imaging",

author = "Maqueda, \{R. J.\} and R. Maingi and K. Tritz and Lee, \{K. C.\} and Bush, \{C. E.\} and Fredrickson, \{E. D.\} and Menard, \{J. E.\} and Roquemore, \{A. L.\} and Sabbagh, \{S. A.\} and Zweben, \{S. J.\}",

year = "2007",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2007.01.166",

language = "English (US)",

volume = "363-365",

pages = "1000--1005",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - Structure of MARFEs and ELMs in NSTX

AU - Maqueda, R. J.

AU - Maingi, R.

AU - Tritz, K.

AU - Lee, K. C.

AU - Bush, C. E.

AU - Fredrickson, E. D.

AU - Menard, J. E.

AU - Roquemore, A. L.

AU - Sabbagh, S. A.

AU - Zweben, S. J.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - The fast-evolving structure of MARFEs and ELMs is observed in the National Spherical Torus Experiment (NSTX) using a fast-framing camera. It is shown that Type V ELMs, the small ELM regime in NSTX, is characterized by a poloidally propagating ionization front close to the separatrix position. The ELMs also interact with the main chamber MARFE observed in NSTX coupling its movement and partial burn-through with that of the ELM cycle. During this cycle a toroidally localized MARFE precursor is seen propagating upward along field lines at speed of the order of 15 km/s. This interaction between ELM activity and MARFEs may be responsible for slow heat pulse propagation speeds seen in the divertor region.

AB - The fast-evolving structure of MARFEs and ELMs is observed in the National Spherical Torus Experiment (NSTX) using a fast-framing camera. It is shown that Type V ELMs, the small ELM regime in NSTX, is characterized by a poloidally propagating ionization front close to the separatrix position. The ELMs also interact with the main chamber MARFE observed in NSTX coupling its movement and partial burn-through with that of the ELM cycle. During this cycle a toroidally localized MARFE precursor is seen propagating upward along field lines at speed of the order of 15 km/s. This interaction between ELM activity and MARFEs may be responsible for slow heat pulse propagation speeds seen in the divertor region.

KW - ELM

KW - MARFE

KW - NSTX

KW - Visible imaging

UR - https://www.scopus.com/pages/publications/34248597725

UR - https://www.scopus.com/pages/publications/34248597725#tab=citedBy

U2 - 10.1016/j.jnucmat.2007.01.166

DO - 10.1016/j.jnucmat.2007.01.166

M3 - Article

AN - SCOPUS:34248597725

SN - 0022-3115

VL - 363-365

SP - 1000

EP - 1005

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

Structure of MARFEs and ELMs in NSTX

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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