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  4. Correlation of surface chemical states with hydrogen isotope retention in divertor tiles of JET with ITER-Like Wall
 
research article

Correlation of surface chemical states with hydrogen isotope retention in divertor tiles of JET with ITER-Like Wall

Oya, Yasuhisa
•
Masuzaki, Suguru
•
Tokitani, Masayuki
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July 1, 2018
Fusion Engineering And Design

To understand the fuel retention mechanism correlation of surface chemical states and hydrogen isotope retention behavior determined by XPS (X-ray photoelectron spectroscopy) and TDS (Thermal desorption spectroscopy), respectively, for JET ITER-Like Wall samples from operational period 2011-2012 were investigated. It was found that the deposition layer was formed on the upper part of the inner vertical divertor area. At the inner plasma strike point region, the original surface materials, W or Mo, were found, indicating to an erosion-dominated region, but deposition of impurities was also found. Higher heat load would induce the formation of metal carbide. At the outer horizontal divertor tile, mixed material layer was formed with iron as an impurity. TDS showed the H and D desorption behavior and the major D desorption temperature for the upper part of the inner vertical tile was located at 370 degrees C and 530 degrees C. At the strike point region, the D desorption temperature was clearly shifted toward higher release temperatures, indicating the stabilization of D trapping by higher heat load

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Type
research article
DOI
10.1016/j.fusengdes.2018.04.124
Web of Science ID

WOS:000436887700005

Author(s)
Oya, Yasuhisa
Masuzaki, Suguru
Tokitani, Masayuki
Azuma, Keisuke
Oyaidzu, Makoto
Isobe, Kanetsugu
Asakura, Nobuyuki
Widdowson, Anna M.
Heinola, Kalle
Jachmich, Stefan
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Date Issued

2018-07-01

Publisher

ELSEVIER SCIENCE SA

Published in
Fusion Engineering And Design
Volume

132

Start page

24

End page

28

Subjects

Nuclear Science & Technology

•

hydrogen isotope behavior

•

plasma wall interactions

•

jet-ilw

•

behavior

•

deuterium

•

neutron

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damage

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
September 20, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/161402
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