The latest results from ELM-simulation experiments in plasma accelerators

Garkusha, I.E.; Arkhipov, N.I.; Климов, Н. С.; Makhlaj, V.A.; Safronov, V.M.; Landman, I.; Tereshin, V.I.

doi:10.1088/0031-8949/2009/t138/014054

Cited by 57 publications

(38 citation statements)

References 12 publications

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“…For example, let us compare irradiation conditions in GOL-3 [20] and QSPA Kh-50 [6], [14]. Parameters of the energy loads of plasma stream for the GOL-3 long pulse accelerator [9], [20], [21] are very close to the QSPA parameters: a pulse duration of up to 0.3 ms and energy loads of up to 2.5 MJ/m 2 .…”

Section: Discussionmentioning

confidence: 90%

“…Crack network changes the heat conductivity; the resulting melting threshold decreased near cracks. Some cracks can have a large depth (up to several hundred microns) after irradiation at the GOL-3 [2], [9], QSPA Kh-50 [14], JUDITH-2 [3] and laser [15] (see Fig.1). Instead of individual cracks, a crack network was always formed and that can lead to destruction of the material as a whole.…”

Section: Cracking Formationmentioning

confidence: 99%

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Comparison of tungsten modification after irradiation at different facilities for PSI studies

Shoshin¹,

Arakcheev²,

Батаев³

et al. 2016

AIP Conference Proceedings

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Section: Discussionmentioning

confidence: 90%

Section: Cracking Formationmentioning

confidence: 99%

Comparison of tungsten modification after irradiation at different facilities for PSI studies

Shoshin¹,

Arakcheev²,

Батаев³

et al. 2016

AIP Conference Proceedings

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“…The material reaction to the loading is related to basic properties such as strength, hardness, the thermal conductivity, the thermal expansion and the melting point. The melting conditions for tungsten have been widely studied [3][4][5][6]. Thus, it is known that ELM-like cycling causes roughening and surface cracking even if the pulse energy is well below the melting threshold.…”

Section: Introductionmentioning

confidence: 99%

“…The surface cracking is frequently observed on tungsten surfaces exposed to transient heat fl uxes causing signifi cant degradation of mechanical properties. The onset of cracking and crack propagation might be delayed by using alloys with elements such as tantalum or lanthanum-oxide [4,7] or by reinforcing the structure using fi bers [8]. Nevertheless, the issue of tungsten melting under transition heat loading for ITER relevant condition remains still an open question.…”

Section: Introductionmentioning

confidence: 99%

Heat load and deuterium plasma effects on SPS and WSP tungsten

et al. 2015

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Abstract. Tungsten is a prime choice for armor material in future nuclear fusion devices. For the realization of fusion, it is necessary to address issues related to the plasma-armor interactions. In this work, several types of tungsten material were studied, i.e. tungsten prepared by spark plasma sintering (SPS) and by water stabilized plasma spraying (WSP) technique. An intended surface porosity was created in the samples to model hydrogen/ helium bubbles. The samples were subjected to a laser heat loading and a radiation loading of deuterium plasma to simulate edge plasma conditions of a nuclear fusion device (power density of 10 8 W/cm 2 and 10 7 W/cm 2 , respectively, in the pulse intervals up to 200 ns). Thermally induced changes in the morphology and the damage to the studied surfaces are described. Possible consequences for the fusion device operation are pointed out.

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“…To date, no tokamak can reach the heat loads expected during ITER ELMs, and laboratory simulation experiments are carried out using electron 3 or plasma guns, 4 or intense lasers aiming at reproducing relevant heat fluxes and timescales. 5 In ITER, however, the divertor plasma-facing materials ͑PFMs͒ will be exposed to both the steady state detached divertor plasma and the intense heat and particle fluxes during ELMs.…”

mentioning

confidence: 99%