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Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; OSTI
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
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Helium (He) concentration depth profiles of evolving tungsten (W) nanostructures have been measured for the first time using in situ Elastic Recoil Detection (ERD) throughout plasma irradiation. In this work, exposures resulting in fuzzy and non-fuzzy surfaces were analyzed in order to illuminate the role of He during the development of these surface morphologies. ERD was performed on samples with surface temperatures from $$T_s$$ = 530–1100 K and irradiated by He flux densities of $$Γ_{\text{He}}$$ ~ 1020–1022 m–2 s–1. He concentration profiles in samples that developed either non-fuzzy or fuzzy surfaces are uniformly shaped with concentrations of 1.5–7 at.%, which is presumed to be too low for pressure driven growth models. Therefore, surface morphology changes are not perpetuated by continuous bubble bursting deformation. Also, a threshold in He flux density above 1020 m–2 s–1 is suggested by using in situ ERD to monitor the depth profile evolution of the He-rich layer while changing the flux during exposure.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
Grant/Contract Number:
SC0002060
OSTI ID:
1897986
Alternate ID(s):
OSTI ID: 22457630
OSTI ID: 1252286
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 463; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (12)

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Microscopic damage of tungsten exposed to deuterium–helium mixture plasma in PISCES and its impacts on retention property journal August 2011
TEM analysis of high temperature annealed W nanostructure surfaces journal February 2012
Comparison of tungsten nano-tendrils grown in Alcator C-Mod and linear plasma devices journal July 2013
Thermal radiation characteristics and direct evidence of tungsten cooling on the way to nanostructure formation on its surface journal July 2013
Helium concentration in tungsten nano-tendril surface morphology using Elastic Recoil Detection journal July 2013
An experiment on the dynamics of ion implantation and sputtering of surfaces journal February 2014
Helium induced nanoscopic morphology on tungsten under fusion relevant plasma conditions journal January 2008
Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions journal August 2009
Tungsten surface evolution by helium bubble nucleation, growth and rupture journal June 2013
On helium cluster dynamics in tungsten plasma facing components of fusion devices journal May 2014
Formation of Nanostructured Tungsten with Arborescent Shape due to Helium Plasma Irradiation journal January 2006

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