TY  - JOUR
AU  - Henkel, Marion
AU  - Li, Y.
AU  - Liang, Yunfeng
AU  - Drews, P.
AU  - Knieps, A.
AU  - Killer, C.
AU  - Nicolai, D.
AU  - Höschen, D.
AU  - Geiger, J.
AU  - Xiao, C.
AU  - Sandri, N.
AU  - Satheeswaran, G.
AU  - Liu, S.
AU  - Grulke, O.
AU  - Jakubowski, M.
AU  - Brezinsek, S.
AU  - Otte, M.
AU  - Neubauer, O.
AU  - Schweer, B.
AU  - Xu, G.
AU  - Cai, J.
TI  - Retarding field analyzer for the wendelstein 7-X boundary plasma
JO  - Fusion engineering and design
VL  - 157
SN  - 0920-3796
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2020-03934
SP  - 111623 -
PY  - 2020
AB  - A bi-directional multi-channel retarding field analyzer (RFA) probe has been successfully developed for the first time on the Wendelstein 7-X (W7-X) stellarator boundary plasma. Modifications to the RFA prototype hardware and its upgrade for the two W7-X island divertor campaigns are presented, including the electronics. In this paper the experiences and challenges operation and customizing an RFA at W7-X are discussed, as well as the data analysis using a maximum coefficient of determination method to obtain the ion temperature based on the measured modulated ion current. Edge ion temperature profiles have been measured in the standard and high iota configurations.    Previous article in issue
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000552961900012
DO  - DOI:10.1016/j.fusengdes.2020.111623
UR  - https://juser.fz-juelich.de/record/885563
ER  -