TY  - JOUR
AU  - Li, Y.
AU  - Fedorczak, N.
AU  - Xu, G. S.
AU  - Liang, Y.
AU  - Brezinsek, S.
AU  - Morales, J.
TI  - Effect of edge ion temperature on the divertor tungsten sputtering in WEST
JO  - Nuclear fusion
VL  - 63
IS  - 2
SN  - 0029-5515
CY  - Vienna
PB  - IAEA
M1  - FZJ-2023-01196
SP  - 026019 -
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000907477800001
DO  - DOI:10.1088/1741-4326/acacb0
UR  - https://juser.fz-juelich.de/record/999153
ER  -