Helium, hydrogen, and fuzz in plasma-facing materials

KD Hammond - Materials Research Express, 2017 - iopscience.iop.org
Tungsten, the primary material under consideration as the divertor material in magnetic-
confinement nuclear fusion reactors, has been known for the last decade to form'fuzz'—a …

Growth of fiberform nanostructures on metal surfaces by helium plasma irradiation

S Kajita, AM Ito, K Ibano - Journal of Applied Physics, 2022 - pubs.aip.org
Helium plasma irradiation to various metals leads to peculiar morphology changes as
forming fiberform nanostructures called fuzz when a certain set of conditions is satisfied. In …

He-ion induced surface morphology change and nanofuzz growth on hot tungsten surfaces

FW Meyer - Journal of Physics B: Atomic, Molecular and Optical …, 2018 - iopscience.iop.org
Tungsten has been recently chosen as the divertor material in ITER and is a leading
candidate for use in DEMO and future fusion reactors. Linear plasma device and laboratory …

Helium flux effects on bubble growth and surface morphology in plasma-facing tungsten from large-scale molecular dynamics simulations

KD Hammond, IV Naeger, W Widanagamaachchi… - Nuclear …, 2019 - iopscience.iop.org
We investigate helium flux effects on helium transport and surface evolution in plasma-
facing tungsten using molecular dynamics. The simulations span two orders of magnitude …

Interaction between hydrogen and helium in tungsten successively exposed by helium and hydrogen plasma

T **a, Z Jiang, Z Wang, Y Shi, X Ren, M Wang… - Journal of Nuclear …, 2023 - Elsevier
The modification of surface, distribution of helium bubbles and the behavior of helium
release are reported through a careful investigation on tungsten samples which were …

Helium retention in tungsten under plasma and ion beam irradiation and its impact on surface morphology

Y Gasparyan, S Ryabtsev, V Efimov… - Physica …, 2020 - iopscience.iop.org
Helium (He) is a product of deuterium-tritium (DT)-fusion reaction and will be a natural
impurity in DT plasma in future fusion devices. He retention in tungsten irradiated by plasma …

Molecular dynamics study on the origin of fuzz structure on tungsten surface

J Wang, D Liu, Z Guo, B He, W Dang - Journal of Nuclear Materials, 2021 - Elsevier
Molecular dynamics was used to investigate the migration of He–V cluster and the
irradiation of He on W (110) surface. Our research shows that the He-V complex can still …

Evolution behavior of helium bubbles and thermal desorption study in helium-charged tungsten film

L Wang, T Hao, BL Zhao, T Zhang, QF Fang… - Journal of Nuclear …, 2018 - Elsevier
In order to investigate the evolution behavior of the formation and growth of He bubble,
helium-charged W films have been prepared by radio frequency (RF) magnetron sputtering …

Quantitatively measuring the influence of helium in plasma-exposed tungsten

RP Doerner, MJ Baldwin, M Simmonds, JH Yu… - Nuclear Materials and …, 2017 - Elsevier
Tungsten samples are exposed to 3 He plasma to quantify their helium retention behavior.
The retention saturates quickly with helium fluence and increases only slightly from 4.3× 10 …

[HTML][HTML] Characterization of helium retention in the inhomogeneous co-deposited layers using a long pulse laser induced ablation-quadrupole mass spectroscopy

Y Lyu, Z He, XY Wang, X Bai, C Li, D Wu, R Hai… - Nuclear Materials and …, 2022 - Elsevier
In this work, a spatially lateral-resolved study of the co-deposition of helium (He) and
aluminum (Al) in non-uniform layers is carried out by a long pulse Laser-Induced Ablation …