Hydrogen isotope exchange mechanism in tungsten studied by ERDA

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Vuoriheimo , T , Jalkanen , P , Liski , A , Mizohata , K , Ahlgren , T , Heinola , K & Räisänen , J 2020 , ' Hydrogen isotope exchange mechanism in tungsten studied by ERDA ' , Physica Scripta , vol. T171 , no. 1 , 014056 . https://doi.org/10.1088/1402-4896/ab57ad

Title: Hydrogen isotope exchange mechanism in tungsten studied by ERDA
Author: Vuoriheimo, Tomi; Jalkanen, Pasi; Liski, Anna; Mizohata, Kenichiro; Ahlgren, Tommy; Heinola, Kalle; Räisänen, Jyrki
Contributor organization: Materials Physics
Department of Physics
Date: 2020-01-01
Language: eng
Number of pages: 4
Belongs to series: Physica Scripta
ISSN: 1402-4896
DOI: https://doi.org/10.1088/1402-4896/ab57ad
URI: http://hdl.handle.net/10138/328026
Abstract: Future fusion reactors use a D–T plasma mixture as fuel. A fraction of hydrogen species can escape the plasma confinement and hit the first wall. Hydrogen isotope exchange, a process in which trapped T atoms are replaced with lighter hydrogen isotopes D or H, is a potential method to minimize radioactive T retention in the wall materials. The present work extends our systematic research on isotope exchange by reversing the process, i.e. by implanting H ions into tungsten followed by subsequent annealing at different constant temperatures in D2 atmosphere. Elastic Recoil Detection Analysis was used to determine the H and D concentrations. The results show that the isotope exchange process takes place regardless of the mass of the active hydrogen isotope. This indicates that the isotope exchange is a statistical phenomenon in which the abundance of the neighboring hydrogen near the trapped hydrogen isotope defines the efficiency of the process.
Subject: 114 Physical sciences
isotope exchange
retention
fusion
tungsten
ion beam analysis
annealing
DEUTERIUM
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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