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Experimental Results of Free Targets

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Laser Interaction and Related Plasma Phenomena

Abstract

Plasmas produced from free small (5 to l0μ radius) electromagnetically suspended LiH targets showed in the first measurements a quite symmetric expansion but finally an asymmetry with a preferential direction against the laser. Preheating by tailored laser pulses re-established conditions of the self-similarity model of a symmetric expansion and heating up to temperatures of few hundred eV. Aluminum balls of 50 to 150 μ radius showed two groups of plasma, a slow spherical inner core fulfilling thermokinetic properties describable by the self-similarity model, and an asymmetric outer shell expanding preferentially against the laser due to a nonlinear surface process. Free hydrogen targets of the same larger size expand symmetrically and drift slowly into the direction of the laser radiation, indicating a recoil by a surface acceleration against the laser. Magnetic fields decrease the expansion velocity and increase the duration of luminosity in some experiments. Emission of microwave radiation can be explained, but many effects are unsolved (increase of ion energy, increase of electric resistivity, instabilities etc.).

Talk presented at the Workshop “Laser Interaction and Related Plasma Phenomena”, Rensselaer Polytechnic Institute, Hartford Graduate Center, June 9–13, 1969.

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Authors and Affiliations

  1. Institut für Plasmaphysik, Rensselaer Polytechnic Institute, Garching, Germany

    Heinrich Hora

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  1. Heinrich Hora
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Editors and Affiliations

  1. Rensselaer Polytechnic Institute, USA

    Helmut J. Schwarz (Professor of Physics) (Professor of Physics)

  2. Institut für Plasmaphysik (Max Planck Society), Rensselaer Polytechnic Institute, Garching, Germany

    Heinrich Hora (Adjunct Associate Professor of Physics) (Adjunct Associate Professor of Physics)

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© 1971 Springer Science+Business Media New York

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Hora, H. (1971). Experimental Results of Free Targets. In: Schwarz, H.J., Hora, H. (eds) Laser Interaction and Related Plasma Phenomena. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-0901-7_12

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  • DOI: https://doi.org/10.1007/978-1-4684-0901-7_12

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-0903-1

  • Online ISBN: 978-1-4684-0901-7

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