Material mixing during fuzz formation in W and Mo

Patino, M. I.; Nishijima, D.; Tokitani, M.; Nagata, D.; Doerner, R. P.

doi:10.1088/1402-4896/ab4c1f

Title: Material mixing during fuzz formation in W and Mo

Abstract

Helium-induced fuzz formation in tungsten (W) and molybdenum (Mo) is investigated for a range of sample exposure temperatures from 838 K–1075 K (He fluence = 3.4 × 10²⁵ m^-2 and ion energy <39 eV). Thin films of Mo deposited on W substrates show mixing of the film and substrate materials in the fuzz after He plasma exposure, including at 838 K (i.e. below the typical temperature range at which fuzz forms in pure W). Finally, the amount of material mixing increases with exposure temperature due to the increase in bubble size, and leads to significant accumulation of the substrate material at the fuzz surface at the highest temperature investigated, further supporting fuzz growth from the fiber tip outwards by material transport up the fibers.

Authors:

Patino, M. I. ^[1];

^[1];

^[2]; Nagata, D. ^[2]; Doerner, R. P. ^[1]

Univ. of California, San Diego, CA (United States)
National Institute for Fusion Science, Gifu (Japan)

Publication Date:: Wed May 27 00:00:00 EDT 2020

Research Org.:: Univ. of California, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Institute for Fusion Science (NIFS)

OSTI Identifier:: 1800542

Grant/Contract Number:: FG02-07ER54912; SC0018302; SC0014664; NIFS19KEMF154

Resource Type:: Accepted Manuscript

Journal Name:: Physica Scripta

Additional Journal Information:: Journal Volume: T171; Journal Issue: 1; Journal ID: ISSN 0031-8949

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; physics; fuzz; tungsten; molybdenum; plasma-material interactions

Citation Formats


                    Patino, M. I., Nishijima, D., Tokitani, M., Nagata, D., and Doerner, R. P. Material mixing during fuzz formation in W and Mo.  United States: N. p., 2020. 
Web.  doi:10.1088/1402-4896/ab4c1f.

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                    Patino, M. I., Nishijima, D., Tokitani, M., Nagata, D., & Doerner, R. P. Material mixing during fuzz formation in W and Mo.  United States.  https://doi.org/10.1088/1402-4896/ab4c1f

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                    Patino, M. I., Nishijima, D., Tokitani, M., Nagata, D., and Doerner, R. P. Wed .  
"Material mixing during fuzz formation in W and Mo".  United States.  https://doi.org/10.1088/1402-4896/ab4c1f.  https://www.osti.gov/servlets/purl/1800542.

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@article{osti_1800542,

  title        = {Material mixing during fuzz formation in W and Mo},

  author       = {Patino, M. I. and Nishijima, D. and Tokitani, M. and Nagata, D. and Doerner, R. P.},

  abstractNote = {Helium-induced fuzz formation in tungsten (W) and molybdenum (Mo) is investigated for a range of sample exposure temperatures from 838 K–1075 K (He fluence = 3.4 × 1025 m-2 and ion energy <39 eV). Thin films of Mo deposited on W substrates show mixing of the film and substrate materials in the fuzz after He plasma exposure, including at 838 K (i.e. below the typical temperature range at which fuzz forms in pure W). Finally, the amount of material mixing increases with exposure temperature due to the increase in bubble size, and leads to significant accumulation of the substrate material at the fuzz surface at the highest temperature investigated, further supporting fuzz growth from the fiber tip outwards by material transport up the fibers.},

  doi          = {10.1088/1402-4896/ab4c1f},

  journal      = {Physica Scripta},

  number       = 1,

  volume       = T171,

  place        = {United States},

  year         = {Wed May 27 00:00:00 EDT 2020},

  month        = {Wed May 27 00:00:00 EDT 2020}

}

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Title: Material mixing during fuzz formation in W and Mo

Abstract

Citation Formats

Model of fuzz formation on a tungsten surface journal, December 2012

Formation of helium induced nanostructure ‘fuzz’ on various tungsten grades journal, September 2010

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Helium diffusion in tungsten: A molecular dynamics study journal, May 2013

Motion of W and He atoms during formation of W fuzz journal, April 2018

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Experimental mechanistic investigation of the nanostructuring of tungsten with low energy helium plasmas journal, December 2016

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Tungsten nano-tendril growth in the Alcator C-Mod divertor journal, March 2012

The Role of the Adatom Diffusion in the Tungsten Fuzz Growth journal, January 2015

Spectroscopic determination of the singly ionized helium density in low electron temperature plasmas mixed with helium in a linear divertor plasma simulator journal, October 2007

Research status and issues of tungsten plasma facing materials for ITER and beyond journal, October 2014

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TEM observation of the growth process of helium nanobubbles on tungsten: Nanostructure formation mechanism journal, November 2011

Challenges and opportunities of modeling plasma–surface interactions in tungsten using high-performance computing journal, August 2015

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Effects of helium bombardment on the deuterium behavior in tungsten journal, December 2002

The effects of high fluence mixed-species (deuterium, helium, beryllium) plasma interactions with tungsten journal, June 2009

Sputtering properties of tungsten ‘fuzzy’ surfaces journal, August 2011

Microscopic damage of tungsten exposed to deuterium–helium mixture plasma in PISCES and its impacts on retention property journal, August 2011

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Alleviation of Helium Holes/Bubbles on Tungsten Surface by Use of Transient Heat Load journal, January 2007

Plasma surface interaction experimental facility (PISCES) for materials and edge physics studies journal, May 1984

Exposure of tungsten nano-structure to TEXTOR edge plasma journal, August 2011

Temperature Range for Fiber-Form Nanostructure Growth on Molybdenum Surfaces due to Helium Plasma Irradiation journal, January 2014

Molecular dynamics simulations of cumulative helium bombardments on tungsten surfaces journal, October 2014

The influence of plasma-surface interaction on the performance of tungsten at the ITER divertor vertical targets journal, March 2018

Surface morphology and deuterium retention in tungsten exposed to low-energy, high flux pure and helium-seeded deuterium plasmas journal, December 2009

Model of fuzz formation on a tungsten surface
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Formation of helium induced nanostructure ‘fuzz’ on various tungsten grades
journal, September 2010

Jump processes in surface diffusion
journal, February 2007

Nanostructure formation on tungsten exposed to low-pressure rf helium plasmas: A study of ion energy threshold and early stage growth
journal, August 2011

Helium diffusion in tungsten: A molecular dynamics study
journal, May 2013

Motion of W and He atoms during formation of W fuzz
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A growth/annealing equilibrium model for helium-induced nanostructure with application to ITER
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Experimental mechanistic investigation of the nanostructuring of tungsten with low energy helium plasmas
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Viscoelastic model of tungsten ‘fuzz’ growth
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Experimental identification for physical mechanism of fiber-form nanostructure growth on metal surfaces with helium plasma irradiation
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Tungsten ‘fuzz’ growth re-examined: the dependence on ion fluence in non-erosive and erosive helium plasma
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