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Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminum layers T. Renger, M. Sznajder, U.R.M.E. Geppert www.DLR.de Chart.

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Presentation on theme: "Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminum layers T. Renger, M. Sznajder, U.R.M.E. Geppert www.DLR.de Chart."— Presentation transcript:

1 Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminum layers T. Renger, M. Sznajder, U.R.M.E. Geppert www.DLR.de Chart 1> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

2 degradation studies especially for thin foils simultaneous irradiation to simulate the solar elm. and particle radiation: photons 40nm < < 2500nm electrons + protons 1…100keV changes in the thermo-optical and elastic material properties measurement of α S and ε mass spectroscopy to evaluate the outgassing processes www.DLR.de Chart 2 The Complex Irradiation Facility (CIF) > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

3 www.DLR.de Chart 3> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

4 www.DLR.de Chart 4> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

5 For this special experiments: Low energy protons Thermal conditioning of the sample 7.5 µm Upilex-S® foil covered on both sides with 100 nm Al www.DLR.de Chart 5> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

6 www.DLR.de Chart 6 100 keV proton / electron dual beam irradiation system > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

7 Target mounting www.DLR.de Chart 7 thermal conditioning: 80 K to 470 K > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

8 Test parameters SampleT [K]E [keV]D [p + cm -2 ]t s [days] A1300.02.54.3 x 10 17 3.5 A2300.06.05.9 x 10 17 4.8 B1323.02.57.8 x 10 17 4.8 B2323.02.58.2 x 10 17 5.0 B3323.02.51.3 x 10 18 7.9 www.DLR.de Chart 8 > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014 See next talk by M.Sznajder

9 Picture of the sample and the spot www.DLR.de Chart 9> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

10 Microscope pictures of sample B3 (unirradiated and irradiated region) www.DLR.de Chart 10> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

11 Microscope pictures of sample A1 and A2 www.DLR.de Chart 11 A1 (2.5 keV; 4.3 x 10 17 p + cm -2 ; 300.0 K)A2 (6.0 keV; 5.9 x 10 17 p + cm -2 ; 300.0 K) > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

12 SRIM simulation: Polyimide covered with 100 nm Al-layer www.DLR.de Chart 12 2.5 keV protons6.0 keV protons 32.8 % pass through the Al-layer > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

13 Microscope pictures of sample B1, B2, and B3 www.DLR.de Chart 13 Average bubble radius: B1: 0.17 ± 0.05 µm (7.8 x 10 17 p + cm -2 ; 2.5 keV; 323.0 K) B2: 0.2 ± 0.05 µm (8.2 x 10 17 p + cm -2 ; 2.5 keV; 323.0 K) B3: 0.25 ± 0.05 µm (1.3 x 10 18 p + cm -2 ; 2.5 keV; 323.0 K) > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

14 Height profile of sample B3 www.DLR.de Chart 14 B3: 1.3 x 10 18 p + cm -2 2.5 keV 323.0 K > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

15 Conclusion Molecular Hydrogen bubbles populate Aluminum surfaces under interplanetary space conditions, depending on energy and dose of incident protons and temperature of the surface The change of morphology of a thin Al-layer depends on the energy of protons. If it is higher then the critical energy, the protons pass through the Al-layer and other effects appear. The average bubble size increases with higher proton doses. www.DLR.de Chart 15> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > 04.04.2014

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