Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET

G.J. van Rooij; J.W. Coenen; L. Aho-Mantila; S. Brezinsek; M. Clever; R. Dux; M. Groth; K. Krieger; S. Marsen; G.F. Matthews; A.G. Meigs; R. Neu; S. Potzel; T. Puetterich; J. Rapp; M.F. Stamp; ASDEX Upgrade team; JET-EFDA  Contributors

doi:10.1016/j.jnucmat.2013.01.007

Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET

G.J. van Rooij, J.W. Coenen, L. Aho-Mantila, S. Brezinsek, M. Clever, R. Dux, M. Groth, K. Krieger, S. Marsen, G.F. Matthews, A.G. Meigs, R. Neu, S. Potzel, T. Puetterich, J. Rapp, M.F. Stamp, ASDEX Upgrade team , JET-EFDA Contributors

Research output: Contribution to journal › Article

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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 similar to 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. (C) 2013 Euratom. Published by Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	S42-S47
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	438
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.007
Publication status	Published - Jul 2013
MoE publication type	A1 Journal article-refereed

Keywords

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van Rooij, G. J., Coenen, J. W., Aho-Mantila, L., Brezinsek, S., Clever, M., Dux, R., Groth, M., Krieger, K., Marsen, S., Matthews, G. F., Meigs, A. G., Neu, R., Potzel, S., Puetterich, T., Rapp, J., Stamp, M. F., Upgrade team , ASDEX., & Contributors, JET-EFDA. (2013). Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET. Journal of Nuclear Materials, 438, S42-S47. https://doi.org/10.1016/j.jnucmat.2013.01.007

van Rooij, G.J. ; Coenen, J.W. ; Aho-Mantila, L. ; Brezinsek, S. ; Clever, M. ; Dux, R. ; Groth, M. ; Krieger, K. ; Marsen, S. ; Matthews, G.F. ; Meigs, A.G. ; Neu, R. ; Potzel, S. ; Puetterich, T. ; Rapp, J. ; Stamp, M.F. ; Upgrade team , ASDEX ; Contributors, JET-EFDA . / Tungsten divertor erosion in all metal devices : Lessons from the ITER like wall of JET. In: Journal of Nuclear Materials. 2013 ; Vol. 438. pp. S42-S47.

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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 similar to 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. (C) 2013 Euratom. Published by Elsevier B.V. All rights reserved.",

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author = "{van Rooij}, G.J. and J.W. Coenen and L. Aho-Mantila and S. Brezinsek and M. Clever and R. Dux and M. Groth and K. Krieger and S. Marsen and G.F. Matthews and A.G. Meigs and R. Neu and S. Potzel and T. Puetterich and J. Rapp and M.F. Stamp and {Upgrade team}, ASDEX and JET-EFDA Contributors",

year = "2013",

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van Rooij, GJ, Coenen, JW, Aho-Mantila, L, Brezinsek, S, Clever, M, Dux, R, Groth, M, Krieger, K, Marsen, S, Matthews, GF, Meigs, AG, Neu, R, Potzel, S, Puetterich, T, Rapp, J, Stamp, MF, Upgrade team , ASDEX & Contributors, JET-EFDA 2013, 'Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET', Journal of Nuclear Materials, vol. 438, pp. S42-S47. https://doi.org/10.1016/j.jnucmat.2013.01.007

Tungsten divertor erosion in all metal devices : Lessons from the ITER like wall of JET. / van Rooij, G.J.; Coenen, J.W.; Aho-Mantila, L.; Brezinsek, S.; Clever, M.; Dux, R.; Groth, M.; Krieger, K.; Marsen, S.; Matthews, G.F.; Meigs, A.G.; Neu, R.; Potzel, S.; Puetterich, T.; Rapp, J.; Stamp, M.F.; Upgrade team , ASDEX; Contributors, JET-EFDA .

In: Journal of Nuclear Materials, Vol. 438, 07.2013, p. S42-S47.

Research output: Contribution to journal › Article

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, L.

AU - Brezinsek, S.

AU - Clever, M.

AU - Dux, R.

AU - Groth, M.

AU - Krieger, K.

AU - Marsen, S.

AU - Matthews, G.F.

AU - Meigs, A.G.

AU - Neu, R.

AU - Potzel, S.

AU - Puetterich, T.

AU - Rapp, J.

AU - Stamp, M.F.

AU - Upgrade team , ASDEX

AU - Contributors, JET-EFDA

PY - 2013/7

Y1 - 2013/7

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 similar to 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. (C) 2013 Euratom. Published by Elsevier B.V. All rights reserved.

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 similar to 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. (C) 2013 Euratom. Published by Elsevier B.V. All rights reserved.

KW - SURFACES

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 -