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. Pütterich; J. Rapp; M. F. Stamp

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

Fusion Energy Division

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

129 Scopus citations

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 language	English
Pages (from-to)	S42-S47
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.007
State	Published - 2013

Funding

This work, supported by the European Communities under the contract of Association between EURATOM and FOM, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
H2020 Euratom
Engineering and Physical Sciences Research Council	EP/I501045/1
Foundation for Fundamental Research on Matter

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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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., Neu, R., Potzel, S., Pütterich, T., Rapp, J., & 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. https://doi.org/10.1016/j.jnucmat.2013.01.007

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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 Coenen, {J. W.} and L. Aho-Mantila and S. Brezinsek and M. Clever and R. Dux and M. Groth and K. Krieger and S. Marsen and Matthews, {G. F.} and A. Meigs and R. Neu and S. Potzel and T. P{\"u}tterich and J. Rapp and Stamp, {M. F.}",

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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, Pütterich, 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. https://doi.org/10.1016/j.jnucmat.2013.01.007

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.

AU - Neu, R.

AU - Potzel, S.

AU - Pütterich, T.

AU - Rapp, J.

AU - Stamp, M. F.

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.

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL

ER -

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

Abstract

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UN SDGs

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