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Heat load and deuterium plasma effects on SPS and WSP tungsten

100%

Vilémová M., Matějíček J., Nevrlá B., Chernyshova M., Gasior P., Kowalska-Strzeciwilk E., Jäger A.

Nukleonika

2015

vol. 60

issue 2

275-283

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 108 W/cm2 and 107 W/cm2, 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.

Study of tungsten surface interaction with plasma streams at DPF-1000U

68%

Ladygina M. S., Skladnik-Sadowska E., Zaloga D. R., Malinowski K., Sadowski M. J., Kubkowska M., Kowalska-Strzeciwilk E., Paduch M., Zielinska E., Miklaszewski R., Garkusha I. E., Gribkov V. A.

Nukleonika

2015

vol. 60

issue 2

293-296

In this note experimental studies of tungsten (W) samples irradiated by intense plasma-ion streams are reported. Measurements were performed using the modified plasma focus device DPF-1000U equipped with an axial gas-puffing system. The main diagnostic tool was a Mechelle®900 optical spectrometer. The electron density of a freely propagating plasma stream (i.e., the plasma stream observed without any target inside the vacuum chamber) was estimated on the basis of the half-width of the Dβ spectral line, taking into account the linear Stark effect. For a freely propagating plasma stream the maximum electron density amounted to about 1.3 × 1017 cm−3 and was reached during the maximum plasma compression. The plasma electron density depends on the initial conditions of the experiments. It was thus important to determine first the plasma flow characteristics before attempting any target irradiation. These data were needed for comparison with plasma characteristics after an irradiation of the investigated target. In fact, spectroscopic measurements performed during interactions of plasma streams with the investigated W samples showed many WI and WII spectral lines. The surface erosion was determined from mass losses of the irradiated samples. Changes on the surfaces of the irradiated samples were also investigated with an optical microscope and some sputtering and melting zones were observed.

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2 Nukleonika

2 2015

2 Kowalska-Strzeciwilk E.

1 Chernyshova M.

1 Garkusha I. E.

1 Gasior P.

1 Gribkov V. A.

1 Jäger A.

1 Kubkowska M.

1 Ladygina M. S.

1 Malinowski K.

1 Matějíček J.

1 Miklaszewski R.

1 Nevrlá B.

1 Paduch M.

1 Sadowski M. J.

1 Skladnik-Sadowska E.

1 Vilémová M.

1 Zaloga D. R.

1 Zielinska E.

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Heat load and deuterium plasma effects on SPS and WSP tungsten

Study of tungsten surface interaction with plasma streams at DPF-1000U