TY  - JOUR
AU  - Li, Cong
AU  - Gierse, Niels
AU  - Oelmann, Jannis
AU  - Brezinsek, Sebastijan
AU  - Rasinski, Marcin
AU  - Prakash Dhard, Chandra
AU  - Sunn Pedersen, Thomas
AU  - König, Ralf
AU  - Liang, Yunfeng
AU  - Ding, Hongbin
AU  - Linsmeier, Christian
TI  - Laser-induced breakdown spectroscopy for Wendelstein 7-X stellarator limiter tile analysis
JO  - Physica scripta
VL  - T170
SN  - 1402-4896
CY  - Stockholm
PB  - The Royal Swedish Academy of Sciences
M1  - FZJ-2021-01521
SP  - 014004 -
PY  - 2017
AB  - Laser-induced breakdown spectroscopy (LIBS) is a well-established elemental composition analysis method as well as one of the most promising candidates for in situ first wall diagnosis of fusion devices. In this work, limiter graphite tiles, which were exposed in the initial operational phase (OP1.1) of the Wendelstein 7-X stellarator to He and H plasma, are analyzed ex situ by LIBS employing a picosecond pulsed laser for the first time and compared with post mortem analysis techniques. Depth profiles of each element and 2D profile of the ratio of H and C atoms on the surface are investigated. Both H content and retention depth on the deposition dominated zone are higher than on the erosion dominated zone due to the formation of C-H co-deposition layer. The results from LIBS are in agreement with those from the cross-sectional scanning electron microscopic image and electron dispersive x-ray spectroscopy.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000414120500004
DO  - DOI:10.1088/0031-8949/2017/T170/014004
UR  - https://juser.fz-juelich.de/record/891439
ER  -