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 …

A review of late-stage tungsten fuzz growth

JAR Wright - Tungsten, 2022 - Springer
Tungsten will be used as the plasma-facing divertor material in the International
Thermonuclear Experimental Reactor (ITER) fusion reactor. Under high temperatures and …

Molecular dynamics and Monte Carlo hybrid simulation for fuzzy tungsten nanostructure formation

AM Ito, A Takayama, Y Oda, T Tamura… - Nuclear …, 2015 - iopscience.iop.org
For the purposes of long-term use of tungsten divertor walls, the formation process of the
fuzzy tungsten nanostructure induced by exposure to the helium plasma was studied. In the …

First-principles study of vacancy, interstitial, noble gas atom interstitial and vacancy clusters in bcc-W

GY Huang, N Juslin, BD Wirth - Computational materials science, 2016 - Elsevier
Based on first-principles calculations, the vacancy and self-interstitial formation energy in
bcc-W are 3.19 eV and 9.97 eV. Binding energy between the dumbbell interstitials can be up …

Hybrid simulation research on formation mechanism of tungsten nanostructure induced by helium plasma irradiation

AM Ito, A Takayama, Y Oda, T Tamura… - Journal of Nuclear …, 2015 - Elsevier
The generation of tungsten fuzzy nanostructure by exposure to helium plasma is one of the
important problems for the use of tungsten material as divertor plates in nuclear fusion …

Growth of nano-tendril bundles on tungsten with impurity-rich He plasmas

D Hwangbo, S Kajita, N Ohno, P McCarthy… - Nuclear …, 2018 - iopscience.iop.org
Isolated regions of nano-tendril bundles (NTBs) have been grown on tungsten surfaces
exposed to low-pressure direct-current helium plasma discharges operating with the …

Influence of plasma impurities on the fuel retention in tungsten

A Kreter, D Nishijima, RP Doerner, M Freisinger… - Nuclear …, 2019 - iopscience.iop.org
The retention of radioactive tritium in the reactor wall is a safety issue and should be kept to
a minimum. We investigated the influence of helium, argon, neon and nitrogen as plasma …

Surface modifications induced by high fluxes of low energy helium ions

I Tanyeli, L Marot, D Mathys, MCM van de Sanden… - Scientific reports, 2015 - nature.com
Several metal surfaces, such as titanium, aluminum and copper, were exposed to highfluxes
(in the range of 1023m− 2s− 1) of low energy (< 100 eV) Helium (He) ions. The surfaces …

Towards understanding the strong trapping effects of noble gas elements on hydrogen in tungsten

YH Li, HB Zhou, GH Lu - International Journal of Hydrogen Energy, 2017 - Elsevier
We have investigated the effects of noble gas elements (helium, neon, argon and krypton)
on the dissolution and accumulation behavior of hydrogen (H) in tungsten (W) using a first …

First-principles investigation of possible clustering of noble gas atoms implanted in bcc tungsten

T Tamura, R Kobayashi, S Ogata… - Modelling and Simulation …, 2013 - iopscience.iop.org
Using first-principles calculations, we have determined key properties of Ar and Ne in bcc W
that relate to the possible bubble formation of implanted Ar and Ne atoms. The most stable …