Figure 5. Theoretical spectra modelling by SCRAM code (a) Modelling was provided for plasma X-ray emission radiation from 3 plasma Zones (see Fig. 1).

All Zones include self-consistent opacity effects for a 6 μm target thickness; Zone 1: T_e = 320 eV, N_e = 2 × 10²³ cm⁻³; Zone 2: T_e = 50 eV, N_e = 3 × 10²³ cm⁻³; Zone 3: T_e = 20 eV, N_e = 3 × 10²³ cm⁻³. To fit the time-integrated spectrum, the intensity in Zone 2 was divided by 100 and the intensity in Zone 3 was divided by 660. Zones 2 and 3 include 1% hot electrons and a Planckian X-ray pump source with T_r = 1 and 1.5 keV, respectively. The measured spectral regions registered by the second and third order reflections of the mica-crystal spectrometer are indicated in gray; (b) Comparison of theoretical and measured spectra, from 6.8 J laser pulse incident on 6 μm Al foil. The proportions of radiation input from the 3 plasma Zones were adjusted to match the experimental spectrum, and suggest that the Zone 1 emission persists much longer than the emission from Zones 2 and 3.