%0 Journal Article
%A Henkel, Marion
%A Li, Y.
%A Liang, Yunfeng
%A Drews, P.
%A Knieps, A.
%A Killer, C.
%A Nicolai, D.
%A Höschen, D.
%A Geiger, J.
%A Xiao, C.
%A Sandri, N.
%A Satheeswaran, G.
%A Liu, S.
%A Grulke, O.
%A Jakubowski, M.
%A Brezinsek, S.
%A Otte, M.
%A Neubauer, O.
%A Schweer, B.
%A Xu, G.
%A Cai, J.
%T Retarding field analyzer for the wendelstein 7-X boundary plasma
%J Fusion engineering and design
%V 157
%@ 0920-3796
%C New York, NY [u.a.]
%I Elsevier
%M FZJ-2020-03934
%P 111623 -
%D 2020
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000552961900012
%R 10.1016/j.fusengdes.2020.111623
%U https://juser.fz-juelich.de/record/885563