Laser-generated plasmas at INFN-LNS |
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Authors: | L Torrisi S Gammino L Celona J Krasa L Laska J Wolowski |
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Institution: | (1) INFN-Laboratori Nazionali del Sud, Via S. Sofia 44, 95124 Catania, Italy;(2) Dipartimento di Fisica, Universitá di Messina, Ctr. Papardo 31, 98166 S. Agata-Messina, Italy;(3) Physics Institute, Academy Science, Na Slovance 2, 18040 Prague, Czech Republic;(4) Institute of Plasma Physics and Laser Microfusion, Hery St. 23, 00-908 Warsaw, Poland |
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Abstract: | Hot plasmas can be generated by fast and intense laser pulses ablating solids placed in vacuum. A Nd:Yag laser operating at
the fundamental and second harmonics with 9-ns pulses (maximum energy of 900 mJ) focused on metallic surfaces produces high
ablation yields of the order of μg/pulse and dense plasma that expands adiabatically at supersonic velocity along the normal
to the target surface. The plasma emits neutral and charged particles. Charge states up to 10+ have been measured in heavy
elements ablated with intensities of the order of 1010 W/cm2. The ion temperature of the plasma is evaluated from the ion energy distributions measured with an ion energy analyzer. The
electron temperature is measured through Faraday cups placed at the end of long drift tubes by using time-of-flight technique.
The neutral temperature is measured with a special mass quadrupole spectrometer placed along the normal to the target surface.
The plasma temperature increases with the laser pulse intensity. The ion temperature reaches values of the order of 400 eV,
the electron temperature is of the order of 1 keV for hot electrons and 0.1 eV for thermal electrons, and the neutral temperature
is of the order of 200 eV. The experimental apparatus, the diagnostic techniques, and the procedures for the plasma temperature
characterization will be presented and discussed in detail.
Published in Russian in Fizika Plazmy, 2006, Vol. 32, No. 6, pp. 558–564.
The text was submitted by the authors in English. |
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