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Title: Laser-ablated loading of solid target through foams of overcritical density

The main objective of the work is to study the conversion of the laser pulse energy into the energy of the hydrodynamic motion of matter in a solid target following the initial absorption of laser radiation in a layer of porous material. Results of experiments on plane massive aluminum targets, coated with a layer of porous plastic with density greater than the critical density of the plasma created, are presented. Experiments were carried out on the laser installation ABC of the Research Center ENEA-Frascati; the targets were irradiated by a beam of the fundamental harmonic of Nd-laser radiation with an energy of about 50 kJ, intensity of 10{sup 13 }W/cm{sup 2}, and 3 ns duration. The experimental method consisted in measuring the volume of the craters created on the aluminum surface behind various thicknesses and densities of the porous absorber of laser radiation. On the basis of these measurements and of an advanced analytical model, quantitative conclusions are made on how the efficiency of laser energy transfer to the solid part of the target (laser-ablated loading) depends on thickness and density of the porous absorber.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [2]
  1. Associazione EURATOM-ENEA Sulla Fusione, Centro Ricerche ENEA C.P. 65, I-00044 Frascati (Italy)
  2. Lebedev Physical Institute, Moscow (Russian Federation)
  3. (MoscowEngineering Physics Institute), National Research Nuclear University, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22490973
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; ALUMINIUM; ENERGY TRANSFER; FOAMS; IRRADIATION; LASER RADIATION; LASER TARGETS; NEODYMIUM LASERS; PLASMA; PLASTICS; POROUS MATERIALS; PULSES; SURFACES; THICKNESS