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In-situ electric resistance measurements and annealing effects of graphite exposed to swift heavy ions

Fernandes, Sandrina and Pellemoine, Frederique and Tomut, Marilena and Avilov, Mikhail and Bender, Markus and Boulesteix, Marine and Krause, Markus and Mittig, Wolfgang and Schein, Mike and Severin, Daniel and Trautmann, Christina :
In-situ electric resistance measurements and annealing effects of graphite exposed to swift heavy ions.
[Online-Edition: http://dx.doi.org/10.1016/j.nimb.2013.04.060]
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 314 pp. 125-129. ISSN 0168583X
[Article] , (2013)

Official URL: http://dx.doi.org/10.1016/j.nimb.2013.04.060

Abstract

To study the suitability of using graphite as material for high-power targets for rare isotope production at the future Facility for Rare Isotope Beams (FRIB) in the USA and at the Facility for Antiproton and Ion Research (FAIR) in Germany, thin foils of polycrystalline graphite were exposed to 8.6-MeV/u Au ions reaching a maximum fluence of 1 × 1015 ions/cm2. Foil irradiation temperatures of up to 1800 °C were obtained by ohmic heating. In-situ monitoring of the electrical resistance of the graphite foils during and after irradiation provided information on beam-induced radiation damage. The rate of electrical resistance increase as a function of fluence was found to decrease with increasing irradiation temperature, indicating a more efficient annealing of the irradiation-produced defects. This is corroborated by the observation that graphite foils irradiated at temperatures below about 800 °C showed cracks and pronounced deformations, which did not appear on the samples irradiated at higher temperatures.

Item Type: Article
Erschienen: 2013
Creators: Fernandes, Sandrina and Pellemoine, Frederique and Tomut, Marilena and Avilov, Mikhail and Bender, Markus and Boulesteix, Marine and Krause, Markus and Mittig, Wolfgang and Schein, Mike and Severin, Daniel and Trautmann, Christina
Title: In-situ electric resistance measurements and annealing effects of graphite exposed to swift heavy ions
Language: English
Abstract:

To study the suitability of using graphite as material for high-power targets for rare isotope production at the future Facility for Rare Isotope Beams (FRIB) in the USA and at the Facility for Antiproton and Ion Research (FAIR) in Germany, thin foils of polycrystalline graphite were exposed to 8.6-MeV/u Au ions reaching a maximum fluence of 1 × 1015 ions/cm2. Foil irradiation temperatures of up to 1800 °C were obtained by ohmic heating. In-situ monitoring of the electrical resistance of the graphite foils during and after irradiation provided information on beam-induced radiation damage. The rate of electrical resistance increase as a function of fluence was found to decrease with increasing irradiation temperature, indicating a more efficient annealing of the irradiation-produced defects. This is corroborated by the observation that graphite foils irradiated at temperatures below about 800 °C showed cracks and pronounced deformations, which did not appear on the samples irradiated at higher temperatures.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 314
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: High-power graphite target, Swift heavy ion, Radiation damage, Electrical resistance
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Apr 2014 09:29
Official URL: http://dx.doi.org/10.1016/j.nimb.2013.04.060
Additional Information:

Eighth International Symposium on Swift Heavy Ions in Matter (SHIM 2012)

Identification Number: doi:10.1016/j.nimb.2013.04.060
Funders: This material is based upon work supported by U.S. Department of Energy, Office of Science under Cooperative Agreement DE-SC0000661.
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