Finite material temperature model for ion energy deposition in ion-driven ICF targets
A model for use in ion-driven ICF target design has been developed to describe the deposition of energy by an arbitrary ion traversing a material of arbitrary composition, density, and temperature. Particular emphasis has been placed on the deposition physics of light ions having specific energies of 3 MeV/amu or less. However, the model is also applicable to heavy ion fusion problems where specific energies in excess of 10 MeV/amu are found. It has been found that an accurate description of the cold material stopping power must include both shell corrections to the Bethe theory as well as the alternative LSS model at low energies. Finite temperature effects are incorporated by scaling the relevant bound electron parameters with the degree of material ionization as well as by including the free electron stopping power. The phenomena of both range shortening and range relengthening in heated material is discussed. Preliminary calculations indicate that the minimum ion range in heated material is approximately one-half that in cold dense targets independent of the identities of the projectile ion and the host material.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5331482
- Report Number(s):
- SAND-80-0038
- Country of Publication:
- United States
- Language:
- English
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