The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications

Antti Hakola, Eduard Grigore (Corresponding author), Cristian Ruset, Flaviu Baiasu, Mehdi Firdaouss, Caroline Hernandez, Armin Weckmann, Per Petersson

Research output: Contribution to conferenceConference AbstractScientificpeer-review

Abstract

Plasma facing components (PFC) within a fusion device are subjected to a harsh operating environment such as high heat fluxes and exposure to high flux of hydrogen isotopes. This exposure can lead to a high fuel retention that can raise serious concern from safety point of view. One of the reason for the use of W as a material for construction of the first wall is aimed to reduce the
fuel retention compared to carbon wall.
Nitrogen seeding, used in the operation of fusion equipment, represents a method to cool the divertor plasma and to reduce the W source in the divertor during inter ELMs. The effects of light impurity seeding have been analyzed so far mainly with focus on plasma heat transport and energy confinement and less on the plasma-wall interaction. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior.

In the present work the influence of nitrogen on deuterium retention into the W coatings produced by high power impulse magnetron sputtering (HIPIMS) has been investigated.
NRA (Nuclear Reaction Analysis), XRD (X-Ray Diffraction) measurements, XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) investigations were used for assessment of the chemical composition, fuel retention and the structure of the coatings. The elemental depth profile has been evaluated by using GDOES (Glow Discharge Optical Emission Spectrometry) measurement. A deuterium content up to 16 at.% has been obtained within the W coatings containing 30 at.% of nitrogen. It has been noticed that the N addition leads to an increase of the deuterium content within the coatings compared with W coatings obtained just in deuterium environment.
Original languageEnglish
Number of pages1
Publication statusPublished - Sep 2018
MoE publication typeNot Eligible
Event30th Symposium on Fusion Technology, SOFT 2018 - Giardini Naxos, Sicily, Giardini Naxos, Italy
Duration: 16 Sep 201821 Sep 2018
https://www.soft2018.eu/

Conference

Conference30th Symposium on Fusion Technology, SOFT 2018
Abbreviated titleSOFT 2018
CountryItaly
CityGiardini Naxos
Period16/09/1821/09/18
Internet address

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deuterium
tungsten
fusion
coatings
nitrogen
hydrogen isotopes
inoculation
nuclear reactions
glow discharges
light emission
impulses
heat flux
safety
magnetron sputtering
chemical composition
x rays
photoelectron spectroscopy
heat
impurities
scanning electron microscopy

Cite this

Hakola, A., Grigore, E., Ruset, C., Baiasu, F., Firdaouss, M., Hernandez, C., ... Petersson, P. (2018). The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications. Abstract from 30th Symposium on Fusion Technology, SOFT 2018, Giardini Naxos, Italy.
Hakola, Antti ; Grigore, Eduard ; Ruset, Cristian ; Baiasu, Flaviu ; Firdaouss, Mehdi ; Hernandez, Caroline ; Weckmann, Armin ; Petersson, Per. / The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications. Abstract from 30th Symposium on Fusion Technology, SOFT 2018, Giardini Naxos, Italy.1 p.
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abstract = "Plasma facing components (PFC) within a fusion device are subjected to a harsh operating environment such as high heat fluxes and exposure to high flux of hydrogen isotopes. This exposure can lead to a high fuel retention that can raise serious concern from safety point of view. One of the reason for the use of W as a material for construction of the first wall is aimed to reduce thefuel retention compared to carbon wall. Nitrogen seeding, used in the operation of fusion equipment, represents a method to cool the divertor plasma and to reduce the W source in the divertor during inter ELMs. The effects of light impurity seeding have been analyzed so far mainly with focus on plasma heat transport and energy confinement and less on the plasma-wall interaction. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior.In the present work the influence of nitrogen on deuterium retention into the W coatings produced by high power impulse magnetron sputtering (HIPIMS) has been investigated.NRA (Nuclear Reaction Analysis), XRD (X-Ray Diffraction) measurements, XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) investigations were used for assessment of the chemical composition, fuel retention and the structure of the coatings. The elemental depth profile has been evaluated by using GDOES (Glow Discharge Optical Emission Spectrometry) measurement. A deuterium content up to 16 at.{\%} has been obtained within the W coatings containing 30 at.{\%} of nitrogen. It has been noticed that the N addition leads to an increase of the deuterium content within the coatings compared with W coatings obtained just in deuterium environment.",
author = "Antti Hakola and Eduard Grigore and Cristian Ruset and Flaviu Baiasu and Mehdi Firdaouss and Caroline Hernandez and Armin Weckmann and Per Petersson",
note = "Poster P4.117 Proceedings of SOFT 2018 will be published in the Fusion Engineering and Design journal.; 30th Symposium on Fusion Technology, SOFT 2018, SOFT 2018 ; Conference date: 16-09-2018 Through 21-09-2018",
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Hakola, A, Grigore, E, Ruset, C, Baiasu, F, Firdaouss, M, Hernandez, C, Weckmann, A & Petersson, P 2018, 'The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications' 30th Symposium on Fusion Technology, SOFT 2018, Giardini Naxos, Italy, 16/09/18 - 21/09/18, .

The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications. / Hakola, Antti; Grigore, Eduard (Corresponding author); Ruset, Cristian; Baiasu, Flaviu; Firdaouss, Mehdi; Hernandez, Caroline; Weckmann, Armin; Petersson, Per.

2018. Abstract from 30th Symposium on Fusion Technology, SOFT 2018, Giardini Naxos, Italy.

Research output: Contribution to conferenceConference AbstractScientificpeer-review

TY - CONF

T1 - The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications

AU - Hakola, Antti

AU - Grigore, Eduard

AU - Ruset, Cristian

AU - Baiasu, Flaviu

AU - Firdaouss, Mehdi

AU - Hernandez, Caroline

AU - Weckmann, Armin

AU - Petersson, Per

N1 - Poster P4.117 Proceedings of SOFT 2018 will be published in the Fusion Engineering and Design journal.

PY - 2018/9

Y1 - 2018/9

N2 - Plasma facing components (PFC) within a fusion device are subjected to a harsh operating environment such as high heat fluxes and exposure to high flux of hydrogen isotopes. This exposure can lead to a high fuel retention that can raise serious concern from safety point of view. One of the reason for the use of W as a material for construction of the first wall is aimed to reduce thefuel retention compared to carbon wall. Nitrogen seeding, used in the operation of fusion equipment, represents a method to cool the divertor plasma and to reduce the W source in the divertor during inter ELMs. The effects of light impurity seeding have been analyzed so far mainly with focus on plasma heat transport and energy confinement and less on the plasma-wall interaction. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior.In the present work the influence of nitrogen on deuterium retention into the W coatings produced by high power impulse magnetron sputtering (HIPIMS) has been investigated.NRA (Nuclear Reaction Analysis), XRD (X-Ray Diffraction) measurements, XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) investigations were used for assessment of the chemical composition, fuel retention and the structure of the coatings. The elemental depth profile has been evaluated by using GDOES (Glow Discharge Optical Emission Spectrometry) measurement. A deuterium content up to 16 at.% has been obtained within the W coatings containing 30 at.% of nitrogen. It has been noticed that the N addition leads to an increase of the deuterium content within the coatings compared with W coatings obtained just in deuterium environment.

AB - Plasma facing components (PFC) within a fusion device are subjected to a harsh operating environment such as high heat fluxes and exposure to high flux of hydrogen isotopes. This exposure can lead to a high fuel retention that can raise serious concern from safety point of view. One of the reason for the use of W as a material for construction of the first wall is aimed to reduce thefuel retention compared to carbon wall. Nitrogen seeding, used in the operation of fusion equipment, represents a method to cool the divertor plasma and to reduce the W source in the divertor during inter ELMs. The effects of light impurity seeding have been analyzed so far mainly with focus on plasma heat transport and energy confinement and less on the plasma-wall interaction. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior.In the present work the influence of nitrogen on deuterium retention into the W coatings produced by high power impulse magnetron sputtering (HIPIMS) has been investigated.NRA (Nuclear Reaction Analysis), XRD (X-Ray Diffraction) measurements, XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) investigations were used for assessment of the chemical composition, fuel retention and the structure of the coatings. The elemental depth profile has been evaluated by using GDOES (Glow Discharge Optical Emission Spectrometry) measurement. A deuterium content up to 16 at.% has been obtained within the W coatings containing 30 at.% of nitrogen. It has been noticed that the N addition leads to an increase of the deuterium content within the coatings compared with W coatings obtained just in deuterium environment.

M3 - Conference Abstract

ER -

Hakola A, Grigore E, Ruset C, Baiasu F, Firdaouss M, Hernandez C et al. The influence of nitrogen on the deuterium retention within tungsten coatings for fusion applications. 2018. Abstract from 30th Symposium on Fusion Technology, SOFT 2018, Giardini Naxos, Italy.