Tungsten divertor erosion in all metal devices

Lessons from the ITER like wall of JET

JET-EFDA collaborators

Research output: Contribution to journalArticleScientificpeer-review

76 Citations (Scopus)

Abstract

Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.
Original languageEnglish
Pages (from-to)S42-S47
Number of pages5
JournalJournal of Nuclear Materials
Volume438
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed
Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
Duration: 21 May 201225 May 2012

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Tungsten
erosion
Sputtering
Erosion
tungsten
sputtering
Metals
metals
Beryllium
plasma temperature
inoculation
beryllium
Nitrogen
signatures
Spectroscopy
Impurities
Plasmas
Heating
nitrogen
impurities

Cite this

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title = "Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET",
abstract = "Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50{\%} redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.",
author = "{van Rooij}, G.J. and J.W. Coenen and Leena Aho-Mantila and S. Brezinsek and M. Clever and R. Dux and K. Krieger and S. Marsen and M. Groth and G.F. Matthews and A. Meigs and R. Neu and S. Potzel and T. P{\"u}tterich and J. Rapp and M.F. Stamp and {JET-EFDA collaborators}",
year = "2013",
doi = "10.1016/j.jnucmat.2013.01.007",
language = "English",
volume = "438",
pages = "S42--S47",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

Tungsten divertor erosion in all metal devices : Lessons from the ITER like wall of JET. / JET-EFDA collaborators.

In: Journal of Nuclear Materials, Vol. 438, 2013, p. S42-S47.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Tungsten divertor erosion in all metal devices

T2 - Lessons from the ITER like wall of JET

AU - van Rooij, G.J.

AU - Coenen, J.W.

AU - Aho-Mantila, Leena

AU - Brezinsek, S.

AU - Clever, M.

AU - Dux, R.

AU - Krieger, K.

AU - Marsen, S.

AU - Groth, M.

AU - Matthews, G.F.

AU - Meigs, A.

AU - Neu, R.

AU - Potzel, S.

AU - Pütterich, T.

AU - Rapp, J.

AU - Stamp, M.F.

AU - JET-EFDA collaborators

PY - 2013

Y1 - 2013

N2 - Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.

AB - Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.

U2 - 10.1016/j.jnucmat.2013.01.007

DO - 10.1016/j.jnucmat.2013.01.007

M3 - Article

VL - 438

SP - S42-S47

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -