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Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions
Nuclear fusion, 2009-09, Vol.49 (9), p.095005-095005 (6)
[Peer Reviewed Journal]
ISSN: 0029-5515 ;EISSN: 1741-4326 ;DOI: 10.1088/0029-5515/49/9/095005
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Title:
Formation process of tungsten nanostructure by the exposure to helium plasma under fusion relevant plasma conditions
Author:
Kajita, Shin
;
Sakaguchi, Wataru
;
Ohno, Noriyasu
;
Yoshida, Naoaki
;
Saeki, Tsubasa
Is Part Of:
Nuclear fusion, 2009-09, Vol.49 (9), p.095005-095005 (6)
Description:
Helium irradiation on tungsten changes the surface morphology dramatically by forming a nanometre-sized fibreform structure which could bring about serious problems for fusion reactors. From the experimental results in liner divertor simulators, it is revealed that the incident ion energy and surface temperature are key parameters for the formation of the structure. It is shown that the tungsten nanostructure is easily formed when the temperature is in the range 1000–2000 K, and the incident ion energy is higher than 20 eV. Furthermore, on the basis of the helium irradiation experiments performed in the divertor simulator NAGDIS-I, the initial formation process of the nanostructure is revealed. It is shown that the nanostructure formation is related to pinholes appearing on the bulk part of the material, and then, the rough structure develops to a much finer nanostructure. The nanostructure was also observed on the molybdenum surface that was exposed to the helium plasma. It increases interest in the possibility that nanostructure formation by helium irradiation is a common phenomenon that occurs on various metals.
Publisher:
IOP Publishing
Language:
English
Identifier:
ISSN: 0029-5515
EISSN: 1741-4326
DOI: 10.1088/0029-5515/49/9/095005
Source:
Alma/SFX Local Collection
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