Fuel retention and carbon deposition on beryllium marker tiles from JET tokamak main chamber limiters investigated by ion beam analysis

(JET Contributors) Tsavalas, P.; Lagoyannis, A.; Mergia, K.; Axiotis, M.; Harissopulos, S.; Provatas, Georgios; Fazinić, Stjepko; Tadić, Tonči; Widdowson, A.; Rubel, M. (2022) Fuel retention and carbon deposition on beryllium marker tiles from JET tokamak main chamber limiters investigated by ion beam analysis. Nuclear fusion, 62 (12). ISSN 0029-5515

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Abstract

The JET tokamak with the ITER-like wall is operated with arrays of castellated beryllium (Be) limiters in the main chamber. In several locations Be marker tiles were installed for erosion-deposition studies. The castellation sides and the plasma-facing surfaces (PFSs) of Be marker tiles from three different locations of the JET main chamber, from the experimental campaigns 2011-12 (ILW-1) and 2013-14 (ILW-2), were analysed, employing H-2 and He-3 micro-beams in order to determine carbon (C) impurity deposition and deuterium (D) retention. The deposited C and D amounts on the castellation sides (up to 1.5 mm deep into the groove) were assessed with respect to the ion/electron drift direction. Both the C and D amounts on the investigated castellation sides either stay constant or reduce with depth from the edge of the PFS. No systematic difference is observed in the C deposition or D retention on the different castellation sides of each sample with respect to the ion/electron drift direction. C and D content is found to be lower on the PFS than on surfaces in the gaps of castellation for the majority of the samples. The C amount is, in general, higher than the D one. No systematic correlation between the C and the D amounts has been observed.

Item Type:	Article
Uncontrolled Keywords:	JET tokamak ; beryllium ; deuterium retention ; ion beam analysis ; carbon deposition
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Depositing User:	Stjepko Fazinić
Date Deposited:	29 Jun 2023 07:44
URI:	http://fulir.irb.hr/id/eprint/8088
DOI:	10.1088/1741-4326/ac9cf0

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