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Area of Science:

  • Plasma physics
  • Radiation physics
  • Laser-target interactions

Background:

  • High-intensity laser interactions with solid targets produce ionizing radiation, including "hot" electrons and bremsstrahlung.
  • Previous research characterized bremsstrahlung dose yields using EPOCH and FLUKA codes for lasers up to 10^16 W cm^-2.

Purpose of the Study:

  • To present electron measurements using a depth-dose approach for two laser intensities.
  • To determine a more suitable model for estimating hot electron energy distribution.
  • To calculate transmission factors and tenth-value layer (TVL) thicknesses for bremsstrahlung shielding using common materials.

Main Methods:

  • Electron measurements utilizing a depth-dose methodology.
  • Analysis of electron energy distribution, suggesting a Maxwellian model.
  • Monte Carlo simulations with FLUKA to compute bremsstrahlung transmission factors and TVLs for various shielding materials.

Main Results:

  • Electron measurements indicate a Maxwellian distribution is appropriate for hot electron energy estimation.
  • Transmission factors for bremsstrahlung through common shielding materials were calculated.
  • Tenth-value layer thicknesses for effective shielding were derived.

Conclusions:

  • The study provides a method for estimating hot electron energy distributions.
  • Calculated shielding parameters (TVLs) aid in designing radiation protection for high-intensity laser facilities.
  • Combining dose yield data with TVLs enables comprehensive radiation hazard evaluation and shielding design.