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SUMMARY:Laser irradiated foam targets: Absorption and Radiative Properties
DTSTART:20180717T123000Z
DTEND:20180717T130000Z
DTSTAMP:20261017T095300Z
UID:indico-event-15373@agenda.infn.it
DESCRIPTION:Speakers: Martina Salvadori (Pisa University)\n\nThe design of
  specific fuel targets represents the crucial point of the Inertial  Confi
 nement Fusion scheme. In fact during the laser-matter interaction\, due to
  the irradiation in homogeneities both parametric and hydrodynamic instabi
 lities could be generated\,  leading to target pre-heating and compression
  inefficiency. In order to avoid these drawbacks it was considered of inte
 rest to coat fusion pellet with light foams\, which can act as absorbers o
 f the laser radiation\, providing a more homogeneous irradiation and enhan
 cing the efficiency of conversion of laser energy into shock wave energy [
 1\,2].\nThe presentation will concern the results of 2016 experimental cam
 paign\, developed at ENEA research center in Frascati (Rome)\, in which we
  studied the behavior of a porous material (Polystyrene Foam) interacting 
 with an high energy Nd laser pulse (duration 3 ns\, 30J energy\, focal spo
 t dimension 100 µm). From streak camera images we estimated the volume in
 volved in absorption and from the measurement of plasma expansion velocity
  it was possible to  roughly estimate the plasma temperature. With semicon
 ductor detectors we were able to get information about the X-ray emission.
   In particular we observed that porous materials present an X-ray emissio
 n higher than the respective solid material\, being comparable to the amou
 nt emitted by an Aluminum target. Concerning the density profile\, the int
 erferometric images highlighted the presence of second harmonic emission\,
  when irradiating solid material and its absence during the irradiation of
  porous plastic\, which can be symptomatic of a plasma characterized by sm
 oother density gradients [3].\n\nReferences\n1.    R. De Angelis\, F. Cons
 oli\, S.Gus'Kov\, A. Rupasov\, P. Andreoli\, G. Cristofari and G. di Giorg
 io\, Physics of Plasmas\, 22\, no. 7\, p 072701 (2015).\n2.    A. Caruso\,
  C. Strangio\, S.Gus'Kov\, and V. Rozanov\, Laser and Particle Beams\, 18\
 , 1\, p 25-35 (1999).\n3.    M. Salvadori\, P. Andreoli\, R. De Angelis\, 
 M. Cipriani\, F. Consoli\, G.Cristofari\, G. di Giorgio\, D. Giulietti\, S
 .Gus'Kov\, F. Ingenito and A. Rupasov\, EPJ Web Of Conference\, 167 (2018)
 .\n\nhttps://agenda.infn.it/event/15373/
LOCATION:Meeting room 126 (Accelerator Division)
URL:https://agenda.infn.it/event/15373/
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