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Implementation of X-Ray Optical Methods for the Investigation of Electron Beam Induced Kα-Emission in fs-Laser-Matter Interaction Experiments

By F. B. Rosmej, E. Fill, M. Kaluza, H. Baumhacker and K. Witte


The interaction of high intensity laser pulses with matter leads to the generation of a considerable amount of hot electrons, e.g. [1], [2], [3]. Due to self-generated magnetic fields, electrons return to the target surface and if the hot electron energy exceeds the ionization energy of a target K-shell electron, characteristic Kα-emission is generated, e.g. [4]. In fs-laser matter interaction experiments, the investigation of the spatial formation of the Kα-emission is of great interest because at certain irradiation conditions, a spatial contraction of the x-ray emitting spot [5]. This in turn leads to the possibility for the development of a x-ray source with µm-dimensions only. The experimental investigation, however, requests simultaneous high spectral resolution (in order to resolve the Kα-doublet) and high spatial resolution (down to µm-scale). For these purposes, we have implemented a spherically curved quartz Bragg crystal at the ATLAS fs-laser installation (Ti:Sapphire, E = 1.2 J, τ = 130 fs, ν = 10 Hz) at MPQ. The curvature radius was Rc = 150 mm, the lattice spacing 2d = 4.912 Å (provided from MISDC at VNIIFTRI). The maximum theoretical spectral resolution is estimated to be 7000. Spectra were recorded with Kodak DEF 5 x-ray film. X-ray images were processed with a 10.000 dpi (dots per inch) drum scanner (provided from EUROCORE). Crystal and film were covered with a 9.8 µm thick Al and 10 µm thick Ni foil, respectively

Topics: Intensity [arb. units] 0.8 K α1 Cu
Year: 2011
OAI identifier: oai:CiteSeerX.psu:
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