Naslov
Study the erosion of Eurofer-97 steel with the linear plasma device GyM

Autori
Uccello, Andrea ; Ghezzi, Francesco ; Kovač, Janez ; Ekar, Jernej ; Filipič, Tatjana ; Bogdanović Radović, Iva ; Dellasega, David ; Mellera, Vittoria ; Pedroni, Matteo ; Ricci, Daria

Izvornik
Nuclear materials and energy (2352-1791) 35 (2023); 101422, 13

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Plasma facing components ; Eurofer-97 steel ; Erosion ; GyM Tokamak

Sažetak
This work reports on the investigation of Eurofer-97 erosion behaviour when exposed to the deuterium plasma of the linear device GyM. The erosion dependence of Eurofer-97 on the deuterium ion fluence, 𝛷 ≤ 2.3 × 1025 m−2, and temperature of the samples, T = 600 K and 990 K, was addressed. A bias voltage of −200 V was applied to GyM sample holder during the experiments. Samples were deeply characterised by: profilometry, scanning electron microscopy, atomic force microscopy, energy-dispersive X-ray spectroscopy, time-of-flight secondary ion mass spectrometry, Rutherford backscattering spectroscopy and particle-induced X-ray emission. The behaviour of Eurofer-97 erosion rate with the ion fluence strictly depends upon temperature. At 600 K, it was ∼0.14 nm/s after 4.7 × 1024 m−2, then decreased, reaching a steady state value of ∼0.01 nm/s from 8.0 × 1024 m−2. At 990 K instead, the erosion rate was roughly constant around 0.019 nm/s for 𝛷 ≤ 1.24 × 1025 m−2. The value at 2.35 × 1025 m−2 was slightly lower. The erosion rate at 990 K was greater than that at 600 K for every ion fluence. Microscopy and surface analysis techniques showed that Eurofer- 97 erosion rate dependence on 𝛷 at 600 K was primarily determined by the preferential sputtering of iron and other mid-Z elements of the alloy, leading to a surface rich in W and Ta difficult to be sputtered. The erosion behaviour at 990 K was dominated by the morphology dynamics, instead. The different properties of the morphology developed at the two temperatures can explain the higher erosion rate at 990 K for all the ion fluen

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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