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

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 Chart 2 The Complex Irradiation Facility (CIF) > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger >

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

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

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 Chart 5> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger >

Chart keV proton / electron dual beam irradiation system > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger >

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

Test parameters SampleT [K]E [keV]D [p + cm -2 ]t s [days] A x A x B x B x B x Chart 8 > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger > See next talk by M.Sznajder

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

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

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

SRIM simulation: Polyimide covered with 100 nm Al-layer Chart 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 >

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

Height profile of sample B3 Chart 14 B3: 1.3 x p + cm keV K > Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger >

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. Chart 15> Experimental studies of low energy proton irradiation of thin vacuum deposited Aluminium layers > T. Renger >