Hubert, Christian ; Voss, Kay-Obbe ; Bender, Markus ; Kupka, Katharina ; Romanenko, Anton ; Severin, Daniel ; Trautmann, Christina ; 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, 365
doi: 10.1016/j.nimb.2015.08.056
Artikel, Bibliographie

Kurzbeschreibung (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.

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