Major Features of VISRAD

Some of the primary capabilities of VISRAD include:

• Supports grid generation for a variety of 2-D and 3-D primitives, as well as pre-configured tetrahedral hohlraums, and cylindrical hohlraums and halfraums.
• Provides capability for surface removal (e.g., drilling holes in cylinders).
• Conveniently provides views from diagnostic ports or any user-specified position.
• Provides easy-to-use target building CAD capability, where target component positions and orientations can be specified in coordinate system of target chamber or any other target component.
• Supports easy use of user-specified object material properties for:
  • Radiation reflection properties (albedos).
  • X-ray conversion efficiencies.
  • Laser reflectivity.
• Supports power sources from:
  • Laser beam systems.
  • Unconverted (1 ω and 2 ω) laser light, for NIF laser beams.
  • Custom, user-defined laser beams.
  • Uniform source emission from target components.
• Provides easy-to-use set up of laser beams:
  • Pointing and focussing specified in coordinate system of target chamber or any target component.
  • Easy specification of beam powers.
  • Grouping of beams into user-specified clusters.
  • Specification of laser beam parameters by clusters, individual beams, or all beams in system.
• Supports modeling of energy deposition for several laser beam spatial profiles:
  • Uniform beams.
  • Supergaussian profiles for OMEGA SG3, SG4, and SG8 phase plates.
  • Phase plates producing elliptical beams.
  • Custom supergaussian profiles.
• Computes effects of reflected laser light off of surfaces ("Glint"). Includes capability for modeling multiple reflections.
• Shows laser beams and their intersections with target components.
• Supports time-dependent modeling of:
  • Albedos, x-ray conversion efficiencies, laser reflectivities, and target component self-emission.
  • Target component sizes.
  • Laser power profiles.
• Includes accurate algorithms for computing configuration factor integrals.
  • View factors include occultation effects (blocking by intervening surfaces).
• Displays output for:
  • Overall power balance.
  • The flux into and out of each target component in the grid.
  • The incident spectrum on to any user-selected surface element in the grid.
  • Contribution to each of the above by each target component in the grid.
• Provides 3-D interactive graphics for:
  • Target grid setup.
  • Laser beams and/or target component power sources.
  • Temperature and flux distributions.
  • Viewing of time-dependent results.

   

Currently supported laser systems

VISRAD currently supports the following major facilities:

• The OMEGA, OMEGA-EP, and MTW facilities at the University of Rochester's Laboratory for Laser Energetics.
• The NIF facility at Lawrence Livermore National Laboratory.
• The ORION facility at AWE (UK).
• The LMJ facility near Bordeaux, France.
• The PLX facility at Los Alamos National Laboratory
• Custom, user-defined laser beam systems.

It is possible that other systems could be added in the future.

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