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Abstract

Blistering and deuterium retention in re-crystallized tungsten exposed to low-energy, high flux pure and helium-seeded D plasmas to a fluence of 10{27} D m{-2} have been examined with scanning electron microscopy, thermal desorption spectroscopy, and the D({3}He,p){4}He nuclear reaction at {3}He energies varied from 0.69 to 4.0 MeV. In the case of exposure to pure D plasma (38 eV D{-1}), blisters with various shapes and sizes depending on the exposure temperature are found on the W surface. No blisters appear at temperatures above 700 K. The deuterium retention increases with the exposure temperature, reaching a maximum value of about 10{22} D m{-2} at 480 K, and then decreases as the temperature rises further. Seeding of 76 eV He ions into the D plasma significantly reduces the D retention at elevated temperatures and prevents formation of the blisters.

Additional information

Authors: ALIMOV V KH, Tritium Technology Group, Japan Atomic Energy Agency, Ibaraki (JP);ISOBE K, Tritium Technology Group, Japan Atomic Energy Agency, Ibaraki (JP);YAMANISHI T, Tritium Technology Group, Japan Atomic Energy Agency, Ibaraki (JP);SHU W M, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ROTH J, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);SUGIYAMA K, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);LINDIG S, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);BALDEN M, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE)
Bibliographic Reference: An article published in: Physica Scripta, Issue T138, December 2009
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0031-8949/2009/T138/014048
Record Number: 201010061 / Last updated on: 2010-01-18
Category: PUBLICATION
Original language: en
Available languages: en
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