On the effects of different regimes of plasma pulses affecting the material due to their succession

•The succession of pulses impacts the development of damages inside the sample.•Powerful pulses at the beginning of the irradiation cycle deteriorate the sample more.•Conductivity suggests the scope of damages extends further than other methods indicate. The tungsten (>99.97% W) samples were irra...

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Published inNuclear materials and energy Vol. 18; pp. 312 - 320
Main Authors Paju, Jana, Laas, Tõnu, Priimets, Jaanis, Väli, Berit, Shirokova, Veroonika, Laas, Katrin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2019
Elsevier
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Abstract •The succession of pulses impacts the development of damages inside the sample.•Powerful pulses at the beginning of the irradiation cycle deteriorate the sample more.•Conductivity suggests the scope of damages extends further than other methods indicate. The tungsten (>99.97% W) samples were irradiated on plasma focus device (PF-12), with deuterium (D) as a working gas, in Tallinn University in Estonia. Two of the samples serve as references, being irradiated in only one regime (either in harsh regime with heat flux factor ∼1000 MW s1/2 m2 for plasma and ∼1.5•105 MW s1/2 m2 for fast ions, or in the mild regime with heat flux factor ∼40–45 MW s1/2 m2 for plasma and ∼2000 MW s1/2 m2 for fast ions). Three of the samples received 27 pulses combining the two aforementioned regimes. The combined effects are obtained by using two different plasma flux values and also by varying the timing when the harsh regime is implemented during the irradiation cycle of each sample. The research is conducted by analyzing the SEM images of the damaged surfaces, measuring the electrical conductivity of the material in the bulk, studying the SEM images and micro-hardness of sample's cross-sections. This will enable to draw conclusions on the range of damages due to the varied succession of used regimes. The results are then combined to estimate the applicability of conductivity measurements instead of using destructive invasive measuring methods (i.e., measurement of micro-hardness and SEM imaging of cross sections). The aims of our research is to shed some light on (1) whether and how the succession of different series of irradiations with varying power flux densities affects the formation of damages on and within the samples and (2) estimating the three-dimensional damages that are created within the bulk of material due to high-temperature plasma and ion shockwaves. Our study indicates that the damage in bulk is related to the timing of harsh regime plasma pulses. The use of measurements of conductivity enables to estimate the future development of the damages in bulk of the material.
AbstractList The tungsten (>99.97% W) samples were irradiated on plasma focus device (PF-12), with deuterium (D) as a working gas, in Tallinn University in Estonia. Two of the samples serve as references, being irradiated in only one regime (either in harsh regime with heat flux factor ∼1000 MW s1/2 m2 for plasma and ∼1.5•105 MW s1/2 m2 for fast ions, or in the mild regime with heat flux factor ∼40–45 MW s1/2 m2 for plasma and ∼2000 MW s1/2 m2 for fast ions). Three of the samples received 27 pulses combining the two aforementioned regimes. The combined effects are obtained by using two different plasma flux values and also by varying the timing when the harsh regime is implemented during the irradiation cycle of each sample. The research is conducted by analyzing the SEM images of the damaged surfaces, measuring the electrical conductivity of the material in the bulk, studying the SEM images and micro-hardness of sample's cross-sections. This will enable to draw conclusions on the range of damages due to the varied succession of used regimes. The results are then combined to estimate the applicability of conductivity measurements instead of using destructive invasive measuring methods (i.e., measurement of micro-hardness and SEM imaging of cross sections).The aims of our research is to shed some light on (1) whether and how the succession of different series of irradiations with varying power flux densities affects the formation of damages on and within the samples and (2) estimating the three-dimensional damages that are created within the bulk of material due to high-temperature plasma and ion shockwaves. Our study indicates that the damage in bulk is related to the timing of harsh regime plasma pulses. The use of measurements of conductivity enables to estimate the future development of the damages in bulk of the material. Keywords: Electrical conductivity, Invasive methods, Micro-hardness, Tungsten, Plasma facing materials, PFC, Non-destructive testing, The order of succession of plasma pulses
•The succession of pulses impacts the development of damages inside the sample.•Powerful pulses at the beginning of the irradiation cycle deteriorate the sample more.•Conductivity suggests the scope of damages extends further than other methods indicate. The tungsten (>99.97% W) samples were irradiated on plasma focus device (PF-12), with deuterium (D) as a working gas, in Tallinn University in Estonia. Two of the samples serve as references, being irradiated in only one regime (either in harsh regime with heat flux factor ∼1000 MW s1/2 m2 for plasma and ∼1.5•105 MW s1/2 m2 for fast ions, or in the mild regime with heat flux factor ∼40–45 MW s1/2 m2 for plasma and ∼2000 MW s1/2 m2 for fast ions). Three of the samples received 27 pulses combining the two aforementioned regimes. The combined effects are obtained by using two different plasma flux values and also by varying the timing when the harsh regime is implemented during the irradiation cycle of each sample. The research is conducted by analyzing the SEM images of the damaged surfaces, measuring the electrical conductivity of the material in the bulk, studying the SEM images and micro-hardness of sample's cross-sections. This will enable to draw conclusions on the range of damages due to the varied succession of used regimes. The results are then combined to estimate the applicability of conductivity measurements instead of using destructive invasive measuring methods (i.e., measurement of micro-hardness and SEM imaging of cross sections). The aims of our research is to shed some light on (1) whether and how the succession of different series of irradiations with varying power flux densities affects the formation of damages on and within the samples and (2) estimating the three-dimensional damages that are created within the bulk of material due to high-temperature plasma and ion shockwaves. Our study indicates that the damage in bulk is related to the timing of harsh regime plasma pulses. The use of measurements of conductivity enables to estimate the future development of the damages in bulk of the material.
Author Paju, Jana
Priimets, Jaanis
Väli, Berit
Laas, Katrin
Laas, Tõnu
Shirokova, Veroonika
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Keywords The order of succession of plasma pulses
Plasma facing materials
Electrical conductivity
Tungsten
Invasive methods
Micro-hardness
Non-destructive testing
PFC
Language English
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Snippet •The succession of pulses impacts the development of damages inside the sample.•Powerful pulses at the beginning of the irradiation cycle deteriorate the...
The tungsten (>99.97% W) samples were irradiated on plasma focus device (PF-12), with deuterium (D) as a working gas, in Tallinn University in Estonia. Two of...
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elsevier
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Publisher
StartPage 312
SubjectTerms Electrical conductivity
Invasive methods
Micro-hardness
Non-destructive testing
PFC
Plasma facing materials
The order of succession of plasma pulses
Tungsten
Title On the effects of different regimes of plasma pulses affecting the material due to their succession
URI https://dx.doi.org/10.1016/j.nme.2019.01.012
https://doaj.org/article/377b04feacc0484897887b2ec98f3d49
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