This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.1088/1741-4326/acacb0 in citations.
Please use the identifier: http://hdl.handle.net/2128/33905 in citations.
Effect of edge ion temperature on the divertor tungsten sputtering in WEST
Effect of edge ion temperature on the divertor tungsten sputtering in WEST
The influence of upstream ion temperature in the scrape-off layer (SOL) on the tungsten (W) sputtering in the divertor is studied in the WEST tokamak. For an almost constant power into the SOL, the upstream ion temperature and its ratio over the electron temperature gradually increase with the decre...
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Personal Name(s): | Li, Y. |
---|---|
Fedorczak, N. / Xu, G. S. / Liang, Y. / Brezinsek, S. (Corresponding author) / Morales, J. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 63 (2023) 2, S. 026019 - |
Imprint: |
Vienna
IAEA
2023
|
DOI: |
10.1088/1741-4326/acacb0 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wand-Wechselwirkung |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/33905 in citations.
The influence of upstream ion temperature in the scrape-off layer (SOL) on the tungsten (W) sputtering in the divertor is studied in the WEST tokamak. For an almost constant power into the SOL, the upstream ion temperature and its ratio over the electron temperature gradually increase with the decrease of electron density in the SOL. This increment is observed to enhance the energy transfer from ions to electrons. This increases the downstream electron temperature and by coupling of electrons and ions, the impact energy of ions causing W sputtering in the divertor. This enhancement mechanism may become crucial to sputtering the W material for high upstream Ti/Te ratio since the impact energy of ions in the divertor would increase accordingly. |