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THE ROLE OF ACCELERATION FACTOR IN PROTON IRRADIATION TESTS

Sznajder, Maciej and Geppert, Ulrich and Dudek, Mirosław and Renger, Thomas (2018) THE ROLE OF ACCELERATION FACTOR IN PROTON IRRADIATION TESTS. 14th International Symposium on Materials in the Space Environment and the 12th International Conference on Protection of Materials from Space Environment, 1-5 OCT 2018, Biarritz, France.

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Abstract

Materials need to undergo qualification testing before being applied to any space mission. Testing includes radiation hardness. It is the aging response of materials to corpuscular and/or electromagnetic radiation. The type of radiation and its amplitude depend on the space environment under study. To perform tests within reasonable times, radiation amplitude must exceed that present in space. Hence, accelerated irradiation tests must be performed. Our main objective is to emphasise potential risks, which may occur upon performing irradiation tests of satellite components with an acceleration factor higher than one. Degradation studies of thin metallized foil with an oxide layer were carried out. The irradiation tests were performed by use of a linear proton accelerator at DLR-Bremen for three different proton flux magnitudes. During the irradiation, the sample surfaces were populated with blisters filled with molecular hydrogen gas. It turns out that the size and the number of blisters depends strongly on the proton flux magnitude. More importantly, we have proven that there exists a threshold of the flux magnitude above which the blistering process is being decelerated. It has direct correlation with the metal oxide layer and its aging condition. The here presented results are important for planning of proton irradiation tests. Too high proton fluxes lead to an acceleration of material degradation that does not reflect the true nature of aging processes as take place in the environment under study. In our case, the presence of the outer aluminium oxide layer has a decisive role in the aluminium degradation process.

Item URL in elib:https://elib.dlr.de/122214/
Document Type:Conference or Workshop Item (Speech)
Title:THE ROLE OF ACCELERATION FACTOR IN PROTON IRRADIATION TESTS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sznajder, MaciejMaciej.Sznajder (at) dlr.dehttps://orcid.org/0000-0002-9917-0581
Geppert, Ulrichulrich.geppert (at) dlr.deUNSPECIFIED
Dudek, Mirosławm.dudek (at) if.uz.zgora.plUNSPECIFIED
Renger, ThomasThomas.Renger (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hydrogen blistering
Event Title:14th International Symposium on Materials in the Space Environment and the 12th International Conference on Protection of Materials from Space Environment
Event Location:Biarritz, France
Event Type:international Conference
Event Dates:1-5 OCT 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):Proj. Entfaltungstechnologie . Solar Sail
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Sznajder, Dr.-Ing. Maciej
Deposited On:16 Oct 2018 09:12
Last Modified:31 Jul 2019 20:20

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