TY - JOUR
T1 - Comparison of Hydrogen Isotope Retention in Divertor Tiles of JET with the ITER-Like Wall Following Campaigns in 2011–2012 and 2015–2016
AU - Oya, Yasuhisa
AU - Masuzaki, Suguru
AU - Tokitani, Masayuki
AU - Nakata, Moeko
AU - Sun, Fei
AU - Oyaidzu, Makoto
AU - Isobe, Kanetsuku
AU - Asakura, Nobuyuki
AU - Otsuka, Teppei
AU - Widdowson, Anna
AU - Likonen, Jari
AU - Rubel, Marek
AU - JET Contributors
N1 - Funding Information:
The authors would like to thank the National Institute for Quantum and Radiological Science and Technology staffs in Rokkasho and Tokai for their support for this work. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been supported by the ITER Broader Approach Activity.
Funding Information:
The authors would like to thank the National Institute for Quantum and Radiological Science and Technology staffs in Rokkasho and Tokai for their support for this work. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014?2018 under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been supported by the ITER Broader Approach Activity.
Publisher Copyright:
© 2020, © 2020 American Nuclear Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/5/18
Y1 - 2020/5/18
N2 - Hydrogen isotope retention and chemical state for the tiles exposed to plasma in the JET–ITER-like wall (ILW) during two campaigns in 2011–2012 (first campaign, ILW-1) and 2015–2016 (third campaign, ILW-3) were studied and compared by means of X-ray photoelectron spectroscopy and thermal desorption spectroscopy. In both campaigns the upper part of the inner divertor tiles was the deposition-dominated area, while erosion was observed on the outer divertor tiles. Therefore, higher deuterium retention was found on the inner divertor tiles. The major D desorption peak for the inner divertor tiles from ILW-3 was located at the temperature range of 470°C to 520°C, which was higher than measured after ILW-1: 370°C to 430°C. The XPS analyses showed the formation of a BeO layer on the ILW-3 inner divertor tiles, while after ILW-1 the layers also contained a significant amount of carbon. Deuterium retention was reduced toward the outer divertor tiles. The differences could be related to the difference in the power level in the two campaigns.
AB - Hydrogen isotope retention and chemical state for the tiles exposed to plasma in the JET–ITER-like wall (ILW) during two campaigns in 2011–2012 (first campaign, ILW-1) and 2015–2016 (third campaign, ILW-3) were studied and compared by means of X-ray photoelectron spectroscopy and thermal desorption spectroscopy. In both campaigns the upper part of the inner divertor tiles was the deposition-dominated area, while erosion was observed on the outer divertor tiles. Therefore, higher deuterium retention was found on the inner divertor tiles. The major D desorption peak for the inner divertor tiles from ILW-3 was located at the temperature range of 470°C to 520°C, which was higher than measured after ILW-1: 370°C to 430°C. The XPS analyses showed the formation of a BeO layer on the ILW-3 inner divertor tiles, while after ILW-1 the layers also contained a significant amount of carbon. Deuterium retention was reduced toward the outer divertor tiles. The differences could be related to the difference in the power level in the two campaigns.
KW - Hydrogen isotope retention
KW - JET–ITER-like wal
KW - plasma wall interactions
UR - https://www.scopus.com/pages/publications/85085284219
U2 - 10.1080/15361055.2020.1716455
DO - 10.1080/15361055.2020.1716455
M3 - Article
SN - 1536-1055
VL - 76
SP - 439
EP - 445
JO - Fusion Science and Technology
JF - Fusion Science and Technology
IS - 4
M1 - 1716455
ER -
SDG 7 Affordable and Clean Energy