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Design and performance of a vacuum-UV simulator for material testing under space conditions

Sznajder, Maciej and Renger, Thomas and Witzke, Andreas and Geppert, Ulrich and Thornagel, Reiner (2013) Design and performance of a vacuum-UV simulator for material testing under space conditions. Advances in Space Research, 52 (11), pp. 1993-2005. Elsevier. DOI: 10.1016/j.asr.2013.08.010 ISSN 0273-1177

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Official URL: http://www.sciencedirect.com/science/article/pii/S027311771300505X

Abstract

This paper describes the construction and performance of a VUV-simulator that has been designed to study degradation of materials under space conditions. It is part of the Complex Irradiation Facility at DLR in Bremen, Germany, that has been built for testing of material under irradiation in the complete UV-range as well as under proton and electron irradiation. Presently available UV-sources used for material tests do not allow the irradiation with wavelengths smaller than about 115 nm where common Deuterium lamps show an intensity cut-off. The VUV-simulator generates radiation by excitation of a gas-flow with an electron beam. The intensity of the radiation can be varied by manipulating the gas-flow and/or the electron beam. The VUV simulator has been calibrated at three different gas-flow settings in the range from 40 nm to 410 nm. The calibration has been made by the Physikalisch-Technische Bundesanstalt (PTB) in Berlin. The measured spectra show total irradiance intensities from 24 to 58 mW m−2 (see Table 4.2) in the VUV-range, i.e., for wavelengths smaller than 200 nm. They exhibit a large number of spectral lines generated either by the gas-flow constituents or by metal atoms in the residual gas which come from metals used in the source construction. In the range from 40 nm to 120 nm where Deuterium lamps are not usable, acceleration factors of 3 to 26.3 Solar Constants are reached depending on the gas-flow setting. The VUV-simulator allows studies of general degradation effects caused by photoionization and photodissociation as well as accelerated degradation tests by use of intensities that are significantly higher compared to that of the Sun at 1 AU.

Item URL in elib:https://elib.dlr.de/85217/
Document Type:Article
Title:Design and performance of a vacuum-UV simulator for material testing under space conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sznajder, Maciejmaciej.sznajder (at) dlr.deUNSPECIFIED
Renger, ThomasThomas.Renger (at) dlr.deUNSPECIFIED
Witzke, Andreasandreas.witzke (at) dlr.deUNSPECIFIED
Geppert, Ulrichulrich.geppert (at) dlr.deUNSPECIFIED
Thornagel, ReinerReiner.Thornagel (at) ptb.deUNSPECIFIED
Date:1 December 2013
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:52
DOI :10.1016/j.asr.2013.08.010
Page Range:pp. 1993-2005
Publisher:Elsevier
ISSN:0273-1177
Status:Published
Keywords:Material testing; UV degradation; VUV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systemkonditionierung
Deposited By: Sznajder, Dr.-Ing. Maciej
Deposited On:12 Nov 2013 11:36
Last Modified:06 Sep 2019 15:27

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