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Swift heavy ion-induced radiation damage in isotropic graphite studied by micro-indentation and in-situ electrical resistivity

Hubert, Christian and Voss, Kay-Obbe and Bender, Markus and Kupka, Katharina and Romanenko, Anton and Severin, Daniel and Trautmann, Christina and Tomut, Marilena (2015):
Swift heavy ion-induced radiation damage in isotropic graphite studied by micro-indentation and in-situ electrical resistivity.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science BV, Netherlands, pp. 509-514, 365, ISSN 0168583X, [Online-Edition: http://dx.doi.org/10.1016/j.nimb.2015.08.056],
[Article]

Abstract

Due to its excellent thermo-physical properties and radiation hardness, isotropic graphite is presently the most promising material candidate for new high-power ion accelerators which will provide highest beam intensities and energies. Under these extreme conditions, specific accelerator components including production targets and beam protection modules are facing the risk of degradation due to radiation damage. Ion-beam induced damage effects were tested bSr irradiating polycrystalline, isotropic graphite samples at the UNILAC (GSI, Darmstadt) with 4.8 MeV per nucleon Xe-132, Sm-150, Au-197, and U-238 ions applying fluences between 1 x 10(11) and 1 x 10(14) ions/cm(2). The overall damage accumulation and its dependence on energy loss of the ions were studied by in situ 4-point resistivity measurements. With increasing fluence, the electric resistivity increases due to disordering of the graphitic structure. Irradiated samples were also analyzed off-line by means of micro-indentation in order to characterize mesoscale effects such as beam-induced hardening and stress fields within the specimen. With increasing fluence and energy loss, hardening becomes more pronounced. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2015
Creators: Hubert, Christian and Voss, Kay-Obbe and Bender, Markus and Kupka, Katharina and Romanenko, Anton and Severin, Daniel and Trautmann, Christina and Tomut, Marilena
Title: Swift heavy ion-induced radiation damage in isotropic graphite studied by micro-indentation and in-situ electrical resistivity
Language: English
Abstract:

Due to its excellent thermo-physical properties and radiation hardness, isotropic graphite is presently the most promising material candidate for new high-power ion accelerators which will provide highest beam intensities and energies. Under these extreme conditions, specific accelerator components including production targets and beam protection modules are facing the risk of degradation due to radiation damage. Ion-beam induced damage effects were tested bSr irradiating polycrystalline, isotropic graphite samples at the UNILAC (GSI, Darmstadt) with 4.8 MeV per nucleon Xe-132, Sm-150, Au-197, and U-238 ions applying fluences between 1 x 10(11) and 1 x 10(14) ions/cm(2). The overall damage accumulation and its dependence on energy loss of the ions were studied by in situ 4-point resistivity measurements. With increasing fluence, the electric resistivity increases due to disordering of the graphitic structure. Irradiated samples were also analyzed off-line by means of micro-indentation in order to characterize mesoscale effects such as beam-induced hardening and stress fields within the specimen. With increasing fluence and energy loss, hardening becomes more pronounced. (C) 2015 Elsevier B.V. All rights reserved.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 365
Publisher: Elsevier Science BV, Netherlands
Uncontrolled Keywords: Radiation damage, Electrical resistivity, Hardening, Graphite, Swift heavy ions
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
05 Department of Physics
Date Deposited: 29 Feb 2016 12:53
Official URL: http://dx.doi.org/10.1016/j.nimb.2015.08.056
Identification Number: doi:10.1016/j.nimb.2015.08.056
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