VUV-heating of plasma layers and their use as ultrafast switches
- 67 Downloads
We report on new possibilities to generate solid-density plasma at extreme energy density by intense VUV beams. Here we consider 100 fs pulses of 30 eV photons focused to 1016 and 1018 W/cm2. The temperature evolution in 50 nm thick aluminum foils is discussed on the basis of simulations, performed with the one-dimensional radiation hydrodynamics code MULTI-fs. For 30 eV photons, the foil is shown to switch from transmission to reflection mode on a femto-second time-scale; this is due to the rapid change of the plasma frequency during laser heating which may turn an initially transparent Al-foil into an opaque one. The switching-time depends on the intensity of the laser pulse. Also layered heating structures inside the foil are discussed which occur due to reflection at the rear surface.
KeywordsEnergy Density Laser Pulse Aluminum Foil Plasma Frequency Reflection Mode
Unable to display preview. Download preview PDF.
- Th. Tschenscher, G. Materlik, TESLA Technical Design Report, Part V, The X-Ray Free Electron Laser, DESY, Hamburg, 2002; see also http://www-hasylab.desy.de/facility/fel Google Scholar
- See the website http://www-ssrl.slac.stanford.edu/LCLS/ for information on the LCLS facility Google Scholar
- S. Atzeni, J. Meyer-ter-Vehn, The Physics of Inertial Fusion (Clarendon Press, Oxford, 2004) Google Scholar
- R.W. Lee et al., J. Opt. Soc. Am. B 20, 770 (2003) Google Scholar
- J. Meyer-ter-Vehn et al., Dense plasma physics studied with XFELs, in Inertial Fusion Sciences and Applications 2003, edited by B.A. Hammel et al. (American Nuclear Society, La Grange Park, Illinois, USA, 2004), p. 912ff Google Scholar
- See website http://www-cxro.lbl.gov Google Scholar
- A. Krenz, Diploma thesis, Technische Universität München, 2003 Google Scholar
- A. Kemp, Das Zustandsgleichungs-Modell MPQEOS für heisse, dichte Materie, Max-Planck-Institute for Quantum Optics, Report MPQ 229 (1998) Google Scholar
- K. Eidmann, Laser Part. Beams 12, 223 (1994) Google Scholar