TY - JOUR
T1 - Nitrogen removal from plasma-facing components by ion cyclotron wall conditioning in TEXTOR
AU - Carrasco, A. G.
AU - Wauters, T.
AU - Petersson, P.
AU - Drenik, A.
AU - Rubel, M.
AU - Crombé, K.
AU - Douai, D.
AU - Fortuna, E.
AU - Kogut, D.
AU - Kreter, A.
AU - Lyssoivan, A.
AU - Möller, S.
AU - Pisarek, M.
AU - Vervier, M.
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/7/22
Y1 - 2015/7/22
N2 - Abstract The efficiency of ion cyclotron wall conditioning (ICWC) in the removal of nitrogen from plasma-facing components in TEXTOR was assessed. In two experiments the wall was loaded with nitrogen and subsequently cleaned by ICWC in deuterium and helium. The retention and removal of nitrogen was studied in-situ by means of mass spectrometry, and ex-situ by surface analysis of a set of graphite, tungsten and TZM plates installed on test limiter systems. 15N rare isotope was used as a marker. The results from the gas balance showed that about 25% of the retained nitrogen was removed after ICWC cleaning, whereas surface analysis of the plates based on ToF-HIERDA showed an increase of the deposited species after the cleaning. This indicates that during ICWC operation on carbon devices, nitrogen is not only pumped out but also transported to other locations on the wall. Additionally, deuterium surface content was studied before and after ICWC cleaning.
AB - Abstract The efficiency of ion cyclotron wall conditioning (ICWC) in the removal of nitrogen from plasma-facing components in TEXTOR was assessed. In two experiments the wall was loaded with nitrogen and subsequently cleaned by ICWC in deuterium and helium. The retention and removal of nitrogen was studied in-situ by means of mass spectrometry, and ex-situ by surface analysis of a set of graphite, tungsten and TZM plates installed on test limiter systems. 15N rare isotope was used as a marker. The results from the gas balance showed that about 25% of the retained nitrogen was removed after ICWC cleaning, whereas surface analysis of the plates based on ToF-HIERDA showed an increase of the deposited species after the cleaning. This indicates that during ICWC operation on carbon devices, nitrogen is not only pumped out but also transported to other locations on the wall. Additionally, deuterium surface content was studied before and after ICWC cleaning.
UR - http://www.scopus.com/inward/record.url?scp=84937731653&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2014.11.113
DO - 10.1016/j.jnucmat.2014.11.113
M3 - Article
AN - SCOPUS:84937731653
SN - 0022-3115
VL - 463
SP - 688
EP - 692
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
M1 - 48709
ER -