Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere

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Ahlgren , T , Jalkanen , P , Mizohata , K , Tuboltsev , V , Räisänen , J , Heinola , K & Tikkanen , P O 2019 , ' Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere ' , Nuclear Fusion , vol. 59 , no. 2 , 026016 . https://doi.org/10.1088/1741-4326/aaf6c9

Title: Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere
Author: Ahlgren, Tommy; Jalkanen, Pasi; Mizohata, Kenichiro; Tuboltsev, Vladimir; Räisänen, Jyrki; Heinola, Kalle; Tikkanen, Pertti O.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-02
Language: eng
Number of pages: 5
Belongs to series: Nuclear Fusion
ISSN: 0029-5515
URI: http://hdl.handle.net/10138/310816
Abstract: The radiological safety of the future thermonuclear fusion devices depends critically on the total tritium inventory in the plasma-facing components. The planned method to remove tritium from the ITER reactor tungsten divertor is to perform vacuum baking. We show that tritium removal from tungsten can be enhanced by the isotope exchange mechanism by doing the baking in H-2 atmosphere. The results show that the retained deuterium from 30 keV implantation can be expected to drop almost to zero after 24h annealing at 250 degrees C in H-2 atmosphere. Annealing in vacuum requires temperatures above 400 degrees C for close to zero retention.
Subject: 114 Physical sciences
isotope exchange
tritium
retention
fusion
tungsten
hydrogen gas
annealing
DEUTERIUM RETENTION
DESORPTION
DIFFUSION
REMOVAL
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