Fuzz Growth Process under He-W Co-Deposition Conditions

SHEN, Wanqi; Kajita, Shin; Tanaka, Hirohiko; Shi, Quan; Ohno, Noriyasu

doi:10.1585/pfr.17.1302094

Cited by 4 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Adatom diffusion and epitaxial growth on fiber surfaces are probably related to the growth of LFNs 23 . However, no LFN growth occurred when the edges of the material were covered 25,26 . This was also the case with magnetron sputtering, where enhanced fuzzy layer growth was observed with auxiliary W deposition, but no LFN growth 27 .…”

Section: Introductionmentioning

confidence: 98%

Growth origin of large-scale fiberform nanostructures in He-W co-deposition environment

Hori

Kajita

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

When tungsten (W) is deposited with helium (He) plasma (He-W co-deposition) on W surface, enhanced growth of fiberform nanostructure (fuzz) occurs, and sometimes it grows into large-scale fuzzy nanostructures (LFNs) thicker than 0.1~mm.In this study, different numbers of mesh openings (apertures) and W plates with nanotendril bundles (NTBs), which are tens of micrometers high nanofiber bundles, were used to investigate the condition for the origin of the LFN growth.It was found that the larger the mesh openings, the larger the area where LFNs are formed and the faster the formation tends to be. On NTB samples, it was found that NTBs grew significantly when exposed to He plasma with W deposition, especially when the size of the NTB reached $\sim$0.1~mm. The concentration of the He flux due to the distortion of the shape of the ion sheath is proposed as one of the reasons to explain the experimental results.

show abstract

Section: Introductionmentioning

confidence: 98%

Growth origin of large-scale fiberform nanostructures in He-W co-deposition environment

Hori

Kajita

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The formation of fuzz has been observed in many environments, i.e. linear plasma devices NAGDIS-II [5], PICIES-B [6], MAGNAM-PSI [7,8], and PSI-2 [9], large torus devices ASDEX Upgrade [10] and Large Helical Device (LHD) [11], and a magnetron sputtering [12]. Therefore, the formation of fuzz is a universal physical phenomenon caused by helium plasma irradiation.…”

Section: Introductionmentioning

confidence: 99%

Tungsten nanostructure growth by sputtering and redeposition in BCA-MD-KMC hybrid simulation

Ito,

Takayama,

Nakamura

2023

Mater. Res. Express

View full text Add to dashboard Cite

The formation mechanism of fibrous tungsten nanostructures, fuzz, induced by helium plasma irradiation on tungsten materials has been investigated. We have developed a BCA-MD-KMC hybrid simulation, which solves the injection process of helium atoms by the Binary Collision Approximation (BCA) method, the diffusion process of helium atoms in tungsten materials by the Kinetic Monte-Carlo (KMC) method, and the deformation of tungsten materials due to helium bubbles by the Molecular Dynamics (MD) method. In addition, the model used to calculate the recoiling of tungsten atoms in BCA was improved to account for the reduced binding energy of tungsten atoms on rough surfaces. Using the hybrid simulation, the height of the nanostructures reached about 50 nm. The main mechanism of nanostructure growth was that sputtering and redeposition caused transport of tungsten atoms perpendicular to the surface. The present simulation was able to represent not only the dependence that the nanostructure height increases in proportion to the square root of the helium fluence, but also the existence of incubation fluence before the growth starts.

show abstract

“…Adatom diffusion and epitaxial growth on fiber surfaces are probably related to the growth of LFNs 32 . However, no LFN growth occurred when the edges of the material were covered 34,35 . This was also the case with magnetron sputtering, where enhanced fuzzy layer growth was observed with auxiliary W deposition, but there was no LFN growth 36 .…”

mentioning

confidence: 97%

Growth origin of large-scale fiberform nanostructures in He–W co-deposition environment

Hori

Kajita

Zhang

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

When tungsten (W) is deposited with helium (He) plasma (He–W co-deposition) on W surface, enhanced growth of fiberform nanostructure (fuzz) occurs, and sometimes it grows into large-scale fuzzy nanostructures (LFNs) thicker than 0.1 mm. In this study, different numbers of mesh opening (apertures) and W plates with nanotendril bundles (NTBs), which are tens of micrometers high nanofiber bundles, were used to investigate the condition for the origin of the LFN growth. It was found that the larger the mesh opening, the larger the area where LFNs are formed and the faster the formation tends to be. On NTB samples, it was found that NTBs grew significantly when exposed to He plasma with W deposition, especially when the size of the NTB reached $$\sim 0.1$$ ∼ 0.1 mm. The concentration of the He flux due to the distortion of the shape of the ion sheath is proposed as one of the reasons to explain the experimental results.

show abstract

Fuzz Growth Process under He-W Co-Deposition Conditions

Cited by 4 publications

References 11 publications

Growth origin of large-scale fiberform nanostructures in He-W co-deposition environment

Growth origin of large-scale fiberform nanostructures in He-W co-deposition environment

Tungsten nanostructure growth by sputtering and redeposition in BCA-MD-KMC hybrid simulation

Growth origin of large-scale fiberform nanostructures in He–W co-deposition environment

Contact Info

Product

Resources

About