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. Meigs, R. Neu, S. Potzel, T. Puetterich, J. Rapp, M.F. Stamp

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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 ∼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.

Cite this

van Rooij, G. J., Coenen, J. W., Aho-Mantila, L., Brezinsek, S., Clever, M., Dux, R., ... Stamp, M. F. (2013). Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET. Journal of Nuclear Materials, 438(suppl), S42-S47. DOI: 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. ; Neu, R. ; Potzel, S. ; Puetterich, T. ; Rapp, J. ; Stamp, M.F./ Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET. In: Journal of Nuclear Materials. 2013 ; Vol. 438, No. suppl. 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 ∼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 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. Meigs and R. Neu and S. Potzel and T. Puetterich and J. Rapp and M.F. Stamp",
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pages = "S42--S47",
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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, A, Neu, R, Potzel, S, Puetterich, T, Rapp, J & Stamp, MF 2013, 'Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET' Journal of Nuclear Materials, vol. 438, no. suppl, pp. S42-S47. DOI: 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.; Neu, R.; Potzel, S.; Puetterich, T.; Rapp, J.; Stamp, M.F.

In: Journal of Nuclear Materials, Vol. 438, No. suppl, 07.2013, p. S42-S47.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Tungsten divertor erosion in all metal devices: 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.

AU - Neu,R.

AU - Potzel,S.

AU - Puetterich,T.

AU - Rapp,J.

AU - Stamp,M.F.

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 ∼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

T2 - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - suppl

ER -

van Rooij GJ, Coenen JW, Aho-Mantila L, Brezinsek S, Clever M, Dux R et al. Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET. Journal of Nuclear Materials. 2013 Jul;438(suppl):S42-S47. Available from, DOI: 10.1016/j.jnucmat.2013.01.007