Q2. What is the critical aspect for the atomic structure?
The most critical aspect for the atomic structure is completeness, defined here as including sufficient numbers and types of levels to incorporate all important channels for population fluxes.
Q3. What is the way to achieve the desired implicit behavior?
The iterative algorithm – with a single iteration – produces evolution tracks that are essentially independent of timestep, achieving the desired implicit behavior.
Q4. What is the basis for NLTE simulations?
The basis for most NLTE simulations is the collisional-radiative (CR) model [1], which describes each atomic system in terms of a number of atomic levels.
Q5. How much power is required to achieve a desired capsule drive?
Using a modified version of XSN whose rates were adjusted to produce approximately the same ionization balance and radiative emission as SCRAM and Cretin in the hohlraum, 1-D simulations showed a reduction of about 20% in the laser power required to achieve a desired capsule drive.
Q6. What is the problem with the generalized transport algorithm?
A generalized transport algorithm designed to be implicit in both temperatures and intensities [36] can remain stable and accurate, but is not yet computationally feasible.
Q7. What is the basic method for calculating ionization balance?
The basic method, distinguishing atomic states solely on the basis of principal quantum numbers, provides surprisingly accurate calculations of ionization balance.
Q8. How much computational expense can be saved by splitting photoexcitations?
In practice, the authors have found that splitting photoexcitations for transitions involving shells up to a couple above the valence shell (not necessarily up to n=7) is sufficient to achieve good results with only a modest increase in computational expense.
Q9. What is the way to enumerate a atomic level?
For simple systems containing only a few electrons, it is feasible to enumerate each atomic level individually in terms of its configuration, fine structure state, or even as magnetic sublevels.
Q10. What is the scaled-hydrogenic energy of the screening coefficients?
The energies obtained from the screening coefficients are scaled within a given isoelectronic sequence to match tabulated ionization potentials between sequences [20].
Q11. What is the optimum radiation field for a 0-D Au plasma?
As an example, the authors consider a 0-D Au plasma at a density of 0.2 g/cm3 and a temperature of 0.3 keV, initially in equilibrium with zero radiation field.
Q12. What is the key piece in calculating ionization balance for complex atoms?
This result, combined with the ability to generate an atomic structure that includes autoionizing states, is perhaps the key piece in inexpensively calculating ionization balance for complex atoms.
Q13. Why does the term splitting procedure improve the spectra of n n’ transitions?
This term-splitting procedure improves the transition energies and general shape of n n’ transition complexes for singly excited states, but does not distinguish between transition complexes from singly and doubly excited levels.
Q14. What is the basic model for calculating spectral properties?
The basic model presented in this section is sufficient for calculating gross material properties, but is insufficient to provide realistic spectral properties and is therefore not suitable for radiation transport simulations.