Intra-ELM tungsten sputtering in JET ITERlike wall: Analytical studies of Be impurity and ELM type influence

JET Contributors

doi:10.1088/1402-4896/aa90c7

Intra-ELM tungsten sputtering in JET ITERlike wall: Analytical studies of Be impurity and ELM type influence

JET Contributors

Research output: Contribution to journal › Conference article › peer-review

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Abstract

The W source strength in JET H-mode discharges depends on the W sputtering in the inter and the intra-ELM phase due to impinging hydrogenic ions (D or H) and impurities (mainly Be). The analytical approach for interpretation of the Langmuir probe measurements is applied to model the ELM ion parallel transport and the W sputtering flux in intra-ELM and inter-ELM conditions in JET-ITER-like wall (ILW) hydrogen and deuterium plasmas. The impact of the Be ion charge and the Be concentration in the impinging ion flux on the W sputtering was estimated. Be²⁺ concentrations of 0.5% and 1% in the impinging ion flux increases the W sputtering fluence per ELM by 20%-30% and 35%-55% correspondingly with respect to pure deuterium plasma; the charge state of Be ions has no substantial effect on W sputtering in the intra-ELM phase. The analysis of JET ELMy H-mode discharges in hydrogen with different types of ELMs is presented. The W sputtering source under inter- and intra-ELM conditions is estimated using the analytical approach and validated by optical emission spectroscopy in these discharges. The intra-ELM W sputtering flux increases 2-4 times in comparison to the inter-ELM flux.

Original language	English
Article number	014065
Journal	Physica Scripta
Volume	2017
Issue number	T170
DOIs	https://doi.org/10.1088/1402-4896/aa90c7
State	Published - 1 Dec 2017
Externally published	Yes
Event	16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 - Neuss/Dusseldorf, Germany Duration: 16 May 2017 → 19 May 2017

Bibliographical note

Publisher Copyright:
© 2017 Forschungszentrum Jülich.

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been initiated within the FZJ—MEPhI strategic partnership. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been initiated within the FZJ-MEPhI strategic partnership.

Funders	Funder number
Euratom research and training program 2014-2018
Horizon 2020 Framework Programme
H2020 Euratom	633053

Keywords

ELM
JET ITER-like wall
Langmuir probe
Physical sputtering
Spectroscopy
Tungsten

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10.1088/1402-4896/aa90c7

Cite this

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title = "Intra-ELM tungsten sputtering in JET ITERlike wall: Analytical studies of Be impurity and ELM type influence",

abstract = "The W source strength in JET H-mode discharges depends on the W sputtering in the inter and the intra-ELM phase due to impinging hydrogenic ions (D or H) and impurities (mainly Be). The analytical approach for interpretation of the Langmuir probe measurements is applied to model the ELM ion parallel transport and the W sputtering flux in intra-ELM and inter-ELM conditions in JET-ITER-like wall (ILW) hydrogen and deuterium plasmas. The impact of the Be ion charge and the Be concentration in the impinging ion flux on the W sputtering was estimated. Be2+ concentrations of 0.5% and 1% in the impinging ion flux increases the W sputtering fluence per ELM by 20%-30% and 35%-55% correspondingly with respect to pure deuterium plasma; the charge state of Be ions has no substantial effect on W sputtering in the intra-ELM phase. The analysis of JET ELMy H-mode discharges in hydrogen with different types of ELMs is presented. The W sputtering source under inter- and intra-ELM conditions is estimated using the analytical approach and validated by optical emission spectroscopy in these discharges. The intra-ELM W sputtering flux increases 2-4 times in comparison to the inter-ELM flux.",

keywords = "ELM, JET ITER-like wall, Langmuir probe, Physical sputtering, Spectroscopy, Tungsten",

author = "{JET Contributors} and I. Borodkina and D. Borodin and S. Brezinsek and Tsvetkov, {I. V.} and Kurnaev, {V. A.} and C. Guillemaut and M. Maslov and L. Frassinetti",

note = "Publisher Copyright: {\textcopyright} 2017 Forschungszentrum J{\"u}lich.; 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 ; Conference date: 16-05-2017 Through 19-05-2017",

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T1 - Intra-ELM tungsten sputtering in JET ITERlike wall

T2 - 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017

AU - JET Contributors

AU - Borodkina, I.

AU - Borodin, D.

AU - Brezinsek, S.

AU - Tsvetkov, I. V.

AU - Kurnaev, V. A.

AU - Guillemaut, C.

AU - Maslov, M.

AU - Frassinetti, L.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The W source strength in JET H-mode discharges depends on the W sputtering in the inter and the intra-ELM phase due to impinging hydrogenic ions (D or H) and impurities (mainly Be). The analytical approach for interpretation of the Langmuir probe measurements is applied to model the ELM ion parallel transport and the W sputtering flux in intra-ELM and inter-ELM conditions in JET-ITER-like wall (ILW) hydrogen and deuterium plasmas. The impact of the Be ion charge and the Be concentration in the impinging ion flux on the W sputtering was estimated. Be2+ concentrations of 0.5% and 1% in the impinging ion flux increases the W sputtering fluence per ELM by 20%-30% and 35%-55% correspondingly with respect to pure deuterium plasma; the charge state of Be ions has no substantial effect on W sputtering in the intra-ELM phase. The analysis of JET ELMy H-mode discharges in hydrogen with different types of ELMs is presented. The W sputtering source under inter- and intra-ELM conditions is estimated using the analytical approach and validated by optical emission spectroscopy in these discharges. The intra-ELM W sputtering flux increases 2-4 times in comparison to the inter-ELM flux.

AB - The W source strength in JET H-mode discharges depends on the W sputtering in the inter and the intra-ELM phase due to impinging hydrogenic ions (D or H) and impurities (mainly Be). The analytical approach for interpretation of the Langmuir probe measurements is applied to model the ELM ion parallel transport and the W sputtering flux in intra-ELM and inter-ELM conditions in JET-ITER-like wall (ILW) hydrogen and deuterium plasmas. The impact of the Be ion charge and the Be concentration in the impinging ion flux on the W sputtering was estimated. Be2+ concentrations of 0.5% and 1% in the impinging ion flux increases the W sputtering fluence per ELM by 20%-30% and 35%-55% correspondingly with respect to pure deuterium plasma; the charge state of Be ions has no substantial effect on W sputtering in the intra-ELM phase. The analysis of JET ELMy H-mode discharges in hydrogen with different types of ELMs is presented. The W sputtering source under inter- and intra-ELM conditions is estimated using the analytical approach and validated by optical emission spectroscopy in these discharges. The intra-ELM W sputtering flux increases 2-4 times in comparison to the inter-ELM flux.

KW - ELM

KW - JET ITER-like wall

KW - Langmuir probe

KW - Physical sputtering

KW - Spectroscopy

KW - Tungsten

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JF - Physica Scripta

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Y2 - 16 May 2017 through 19 May 2017

ER -

Intra-ELM tungsten sputtering in JET ITERlike wall: Analytical studies of Be impurity and ELM type influence

Abstract

Bibliographical note

Funding

Keywords

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