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Title: Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser

We demonstrate the use of extreme ultra-violet (EUV) laboratory lasers in probing energy transport in laser irradiated solid targets. EUV transmission through targets containing a thin layer of iron (50 nm) encased in plastic (CH) after irradiation by a short pulse (35 fs) laser focussed to irradiances 3 × 10{sup 16} Wcm{sup −2} is measured. Heating of the iron layer gives rise to a rapid decrease in EUV opacity and an increase in the transmission of the 13.9 nm laser radiation as the iron ionizes to Fe{sup 5+} and above where the ion ionisation energy is greater than the EUV probe photon energy (89 eV). A one dimensional hydrodynamic fluid code HYADES has been used to simulate the temporal variation in EUV transmission (wavelength 13.9 nm) using IMP opacity values for the iron layer and the simulated transmissions are compared to measured transmission values. When a deliberate pre-pulse is used to preform an expanding plastic plasma, it is found that radiation is important in the heating of the iron layer while for pre-pulse free irradiation, radiation transport is not significant.
Authors:
; ; ;  [1] ;  [2] ; ; ; ; ;  [3] ; ;  [4] ;  [5]
  1. York Plasma Institute, The University of York, York YO10 5DQ (United Kingdom)
  2. Central Laser Facility, STFC Rutherford Appleton Laboratory, Oxfordshire OX11 0QX (United Kingdom)
  3. Laboratoire de Physique de Gaz et des Plasmas, UMR 8578 CNRS, Orsay (France)
  4. LASERIX, Centre Laser de I'Universite Paris Sud, Federation Lumiere-Matiere, FR2764, 91405 Orsay Cedex (France)
  5. Centro de Fisica de Plasmas, Instituto Superior Técnico, Av. Rovisco pais 1, 1049-001, Lisbon (Portugal)
Publication Date:
OSTI Identifier:
22423775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; 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; COMPUTERIZED SIMULATION; ENERGY TRANSFER; EV RANGE; EXTREME ULTRAVIOLET RADIATION; HEATING; HYDRODYNAMICS; IONIZATION; IRON; IRON IONS; IRRADIATION; LASER RADIATION; ONE-DIMENSIONAL CALCULATIONS; OPACITY; PHOTONS; PLASMA EXPANSION; PULSES; RADIANT FLUX DENSITY; RADIATION TRANSPORT; THIN FILMS; WAVELENGTHS