Parallel investigation of double forged pure tungsten samples irradiated in three DPF devices

Грибков, В. А.; Paduch, M.; Zielinska, E.; Laas, T.; Shirokova, Veroonika; Väli, Berit; Paju, J.; Пименов, В. Н.; Demina, E. V.; Latyshev, S. V.; Niemela, Joseph; Crespo, M.L.; Cicuttin, A.; Talab, A. A.; Pokatilov, Andrei; Parker, M.R.

doi:10.1016/j.jnucmat.2014.11.080

Cited by 6 publications

(2 citation statements)

References 13 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%

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%

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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“…For such investigations different simulators of transient plasma loads are now applied (e.g., a quasistationary plasma accelerator (QSPA), e-beams generators, linear facility, dense plasma-focus (PF) devices and different plasma guns). They are cost effective, flexible, and able to provide faster experimental results as well as an important comparison of damages produced in various machines [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Simulation of plasma–surface interactions in a fusion reactor by means of QSPA plasma streams: recent results and prospects

Garkusha¹,

Aksenov²,

Byrka³

et al. 2016

Phys. Scr.

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This paper is devoted to plasma-surface interaction issues at high heat-loads which are typical for fusion reactors. For the International Thermonuclear Experimental Reactor (ITER), which is now under construction, the knowledge of erosion processes and the behaviour of various constructional materials under extreme conditions is a very critical issue, which will determine a successful realization of the project. The most important plasma-surface interaction (PSI) effects in 3D geometry have been studied using a QSPA Kh-50 powerful quasi-stationary plasma accelerator. Mechanisms of the droplet and dust generation have been investigated in detail. It was found that the droplets emission from castellated surfaces has a threshold character and a cyclic nature. It begins only after a certain number of the irradiating plasma pulses when molten and shifted material is accumulated at the edges of the castellated structure. This new erosion mechanism, connected with the edge effects, results in an increase in the size of the emitted droplets (as compared with those emitted from a flat surface). This mechanism can even induce the ejection of sub-mm particles. A concept of a new-generation QSPA facility, the current status of this device maintenance, and prospects for further experiments are also presented.

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

Paju

Laas

Priimets

et al. 2019

Nuclear Materials and Energy

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Parallel investigation of double forged pure tungsten samples irradiated in three DPF devices

Cited by 6 publications

References 13 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

Simulation of plasma–surface interactions in a fusion reactor by means of QSPA plasma streams: recent results and prospects

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

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