Model for optical-laser-induced impulse in vacuo
A simple model, along with its derivation, is presented for calculating the impulse from targets in a vacuum exposed to single-pulse, optical lasers. Figures demonstrate that throughout most of the range of interest, results from the model agree well with experimental data and LASNEX radiation-hydrodynamic computer code calculations. The model assumes isothermal blowoff and thus takes advantage of the insensitivity of impulse to energy distribution within the ablated mass. The density profile in the blowoff is estimated and the Saha equation is used to evaluate the degree of ionization. The laser absorption coefficient and thermal radiation opacity are evaluated as a function of position in the blowoff in order to evaluate the energy reaching the ablation surface. An overall energy balance plus an energy balance at the ablation surface are used to determine the blowoff mass and temperature. The success of the model indicates that the impulse is insensitive to detailed interactions in the vicinity of the ablation surface. 11 refs., 6 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6414183
- Report Number(s):
- LA-UR-85-4472; CONF-8511120-3; ON: DE86004752
- Country of Publication:
- United States
- Language:
- English
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ABLATION
ALUMINIUM
COMPUTERIZED SIMULATION
DATA
ELEMENTS
EQUATIONS
FLUID MECHANICS
HYDRODYNAMICS
IMPLOSIONS
INFORMATION
ISOTHERMAL PROCESSES
LASER IMPLOSIONS
LASER TARGETS
MECHANICS
METALS
NUMERICAL DATA
OPACITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SAHA EQUATION
SIMULATION
TARGETS
THEORETICAL DATA