Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP

Description

Selected set of samples from JET TER-Like Wall (JET-ILW) divertor tiles exposed both in 20132014 and 20112014 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts ob tained with TIS were compared with ion Beam Analysis (TBA) and Secondary ion Mass Spectrometry (SIMS) data. The hig amount of D was found on the top part of inner divertor which has regions with the thickest deposited layers. This area resides deep in the scrape-off layer. Changes in plasma configurations between the first 20112012 and the second 20132014 JET-IL W campaign altered the material migration towards the inner and the outer divertor come increasing the amount of deposition in the shadowed areas of the divertor base tiles. Retention on the outer divertor tiles is clearly smaller than on the inner divertor tiles. Experimental TDS spectra for samples from the top part of inner divertor and from the outer strike point region were modelled using TMAP program. Experimental deuterium profiles obtained with SIMS have been used and the detrapping and the activation energies have been adjusted Analysis of the results of the TMAP simulations enabled to determine the nature of traps in different samples

Abstract

EURATOM 633053

Abstract

Finnish FundingAgency forTechnology and Innovation 4433/31/2015

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