Abstract
In this paper, a low activation of ferritic-austentic steel was studied when it was exposed with plasma. The experiment was carried out on a plasma focus device with energy of 1.9 kJ, with a pressure of 2.5 torr of deuterium. AFM analysis shows that cracks up to 2 microns and holes from 81 to 281 nm are found on steel surfaces. The mechanism of the occurrence of erosion of low-activation ferritic-austentic steel is also indicated. It is established that the mechanism of erosion depends on the momentum.
Highlights
One of the most important tasks of plasma physics [1] is to study the resistance of materials of the first wall, the divertor and other nodes of the thermonuclear reactor to stationary plasma-thermal effects with a capacity of up to 20 mW/m2 and intense pulsed duration of 0.1–10 ms and a power of 1–10 GW/m2 [1,2,3]
Analysis of the surface materials shows that erosion of the melt layer occurs mainly due to two erosion mechanisms: due to the ejection of metal drops from the target surface and due to the movement of the melt along the target surface
Melt motion leads to displacement of the material along the surface and this mechanism might be analyzed through the measurement of the surface specimens by scanning electron microscopy (SEM)
Summary
One of the most important tasks of plasma physics [1] is to study the resistance of materials of the first wall, the divertor and other nodes of the thermonuclear reactor to stationary plasma-thermal effects with a capacity of up to 20 mW/m2 and intense pulsed duration of 0.1–10 ms and a power of 1–10 GW/m2 [1,2,3]. Many of the basic problems investigated and solved but one of the main problems still not enough investigated is connected with material science and radiation nuclear physics [1,2,3,4,5,6,7,8,9,10,11,12] They are long lasting irradiation and heat loads that are generated in the fusion devices affect the construction materials and appearance different of defects on the surface materials. The important note of the work is connected with the fact that tungsten is plasma-facing material in ITER, whereas ferritic-martensitic steels are used as plasma-facing materials in thermonuclear devices and intended for structural components of ITER. In [6,7] were shown that the main factor leading to damage to materials under the influence of plasma is thermal loads that lead to melting of the irradiated surface layers, erosion of materials (loss of mass during evaporation), the formation of various types of surface defects and micro cracks
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