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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

Abstract

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:10.1.1.183.4777
Provided by: CiteSeerX
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