Effect of ion flux on helium retention in helium-irradiated tungsten

Rivera de Mena, Antonio and Valles, G. and Caturla Terol, Maria Jose and Martín-Bragado, I. (2013). Effect of ion flux on helium retention in helium-irradiated tungsten. "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms", v. 303 ; pp. 81-83. ISSN 0168-583X. https://doi.org/10.1016/j.nimb.2012.10.038.

Description

Title: Effect of ion flux on helium retention in helium-irradiated tungsten
Author/s:
  • Rivera de Mena, Antonio
  • Valles, G.
  • Caturla Terol, Maria Jose
  • Martín-Bragado, I.
Item Type: Article
Título de Revista/Publicación: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Date: May 2013
ISSN: 0168-583X
Volume: 303
Subjects:
Freetext Keywords: Tungsten; Nuclear fusion; Helium irradiation; Pulsed irradiation; Object Kinetic Monte Carlo
Faculty: Instituto de Fusión Nuclear (UPM)
Department: Ingeniería Nuclear [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Helium retention in irradiated tungsten leads to swelling, pore formation, sample exfoliation and embrittlement with deleterious consequences in many applications. In particular, the use of tungsten in future nuclear fusion plants is proposed due to its good refractory properties. However, serious concerns about tungsten survivability stems from the fact that it must withstand severe irradiation conditions. In magnetic fusion as well as in inertial fusion (particularly with direct drive targets), tungsten components will be exposed to low and high energy ion irradiation (helium), respectively. A common feature is that the most detrimental situations will take place in pulsed mode, i.e., high flux irradiation. There is increasing evidence of a correlation between a high helium flux and an enhancement of detrimental effects on tungsten. Nevertheless, the nature of these effects is not well understood due to the subtleties imposed by the exact temperature profile evolution, ion energy, pulse duration, existence of impurities and simultaneous irradiation with other species. Object Kinetic Monte Carlo is the technique of choice to simulate the evolution of radiation-induced damage inside solids in large temporal and space scales. We have used the recently developed code MMonCa (Modular Monte Carlo simulator), presented at COSIRES 2012 for the first time, to study He retention (and in general defect evolution) in tungsten samples irradiated with high intensity helium pulses. The code simulates the interactions among a large variety of defects and during the irradiation stage and the subsequent annealing steps. The results show that the pulsed mode leads to significantly higher He retention at temperatures higher than 700 K. In this paper we discuss the process of He retention in terms of trap evolution. In addition, we discuss the implications of these findings for inertial fusion.

More information

Item ID: 25705
DC Identifier: http://oa.upm.es/25705/
OAI Identifier: oai:oa.upm.es:25705
DOI: 10.1016/j.nimb.2012.10.038
Official URL: http://www.sciencedirect.com/science/article/pii/S0168583X12006751
Deposited by: Memoria Investigacion
Deposited on: 22 Apr 2015 16:13
Last Modified: 01 Jun 2015 22:56
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