High power plasma interaction with tungsten grades in ITER relevant conditions

Garkusha, I.E.; Makhlaj, V.A.; Aksenov, N.N.; Byrka, O.V.; Malykhin, S.V.; Pugachov, A T; Базылев, Б.; Landman, I.; Pinsuk, G; Linke, J.; Wirtz, M.; Sadowski, M.; Składnik‐Sadowska, E.

doi:10.1088/1742-6596/591/1/012030

Cited by 12 publications

(18 citation statements)

References 14 publications

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“…Plasma-material interaction studies showed that higher heat fl ux factor F leads to higher values of microroughness upon irradiated surfaces (see [1,9,10,22]). Therefore, the sample DFW 87a should have greater microroughness R a values than DFW 88a.…”

Section: Results and Analysis Of Surface Defectsmentioning

confidence: 99%

“…A hydrogen-plasma pulse shape was approximately triangular, and the pulse duration was ca. 0.25 ms (see [1] for detailed experimental set-up and device parameters). Garkusha et al have shown that (a) irradiation of cracked tungsten causes the appearance of tungsten dust from intersections of the cracks [1], (b) the molten layer generated by plasma may lead to covering and disappearance of cracks, microcracks and to smoothing of a surface layer [20].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Many of the basic problems that have been investigated and solved are in common for all fusion facilities [1,2]. One aspect of the problems relevant to all future fusion devices is closely related to materials science.…”

Section: Introductionmentioning

confidence: 99%

“…One aspect of the problems relevant to all future fusion devices is closely related to materials science. The main questions are: (1) how can the long-lasting irradiation and the heat loads that are generated in the fusion devices affect the plasma--facing materials; (2) why do the defects (e.g. mesh of cracks, pores, wave-like structures, exfoliations, bubbles, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Thus, occurrence of surface damages is proportional to the rise of the surface temperature. Solving the 1D heat equation for homogeneous fi nite-duration heat loads on semi-infi nite surface enables to calculate the maximal rise of the materials surface temperature as follows: (1) where q is power fl ux density,  the infl uence time of the heat fl ux (plasma fl ux),  the material's density,  the thermal conductivity and c the specifi c heat capacity (at constant pressure).…”

Section: Introductionmentioning

confidence: 99%

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The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

et al. 2016

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Abstract. The infl uence of extreme heat loads, as produced by a multiple pulses of non-homogeneous fl ow of slow plasma (0.1-1 keV) and fast ions (100 keV), on double-forged tungsten (DFW) was investigated. For generation of deuterium plasma and fast deuterons, plasma-focus devices PF-12 and PF-1000 are used. Depending on devices and conditions, the power fl ux density of plasma varied in a range of 10 7 -10 10 W/cm 2 with pulse duration of 50-100 ns. Power fl ux density of fast ions was 10 10 -10 12 W/cm 2 at the pulse duration of 10-50 ns. To achieve the combined effect of different kind of plasmas, the samples were later irradiated with hydrogen plasma (10 5 W/cm 2 , 0.25 ms) by a QSPA Kh-50 plasma generator. Surface modifi cation was analysed by scanning electron microscopy (SEM) and microroughness measurements. For estimation of damages in the bulk of material, an electrical conductivity method was used. Investigations showed that irradiation of DFW with multiple plasma pulses generated a mesh of micro-and macrocracks due to high heat load. A comparison with single forged tungsten (W) and tungsten doped with 1% lanthanum-oxide (WL10) reveals the better crack-resistance of DFW. Also, sizes of cells formed between the cracks on the DFW's surface were larger than in cases of W or WL10. Measurements of electrical conductivity indicated a layer of decreased conductivity, which reached up to 500 m. It depended mainly on values of power fl ux density of fast ions, but not on the number of pulses. Thus, it may be concluded that bulk defects (weakening bonds between grains and crystals, dislocations, point-defects) were generated due to mechanical shock wave, which was generated by the fast ions fl ux. Damages and erosion of materials under different combined radiation conditions have also been discussed.

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Section: Results and Analysis Of Surface Defectsmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

et al. 2016

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Dust and powder in fusion plasmas: recent developments in theory, modeling, and experiments

Ratynskaia

Bortolon

Krasheninnikov

2022

Rev. Mod. Plasma Phys.

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In this paper, we present a brief historic overview of the research on dust in fusion devices with carbon plasma-facing components and then highlight the most recent developments in the post-carbon era of the field. In particular, we consider how the metallic dust form, mobilize, and interact with fusion plasmas and plasma facing components. Achievements in wall conditioning and associated anomalous plasma transport modification, including ELM suppression, with the powder injection technique is another focus of the paper. Capabilities of the state-of-art simulation tools to describe different aspects of dust in fusion devices are exemplified and new directions for future dust studies are brought forward.

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Generation and development of damage in double forged tungsten in different combined regimes of irradiation with extreme heat loads

Paju

Väli

Laas

et al. 2017

Journal of Nuclear Materials

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High power plasma interaction with tungsten grades in ITER relevant conditions

Cited by 12 publications

References 14 publications

The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

The experimental and theoretical investigations of damage development and distribution in double-forged tungsten under plasma irradiation-initiated extreme heat loads

Dust and powder in fusion plasmas: recent developments in theory, modeling, and experiments

Generation and development of damage in double forged tungsten in different combined regimes of irradiation with extreme heat loads

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