Fig. 1. Schematic of experimental arrangement.

Fig. 2. X-ray detector. (a) 3D model of detector. (b) Photograph of prepared detector with a set of Ross filters. (c) Example of image plate signal, where the individual filters are labeled by the foil material and thickness in micrometers.

Fig. 3. Photon transmission characteristics of thin filters.

Fig. 4. Differential photon transmission characteristics of thin filter pairs.

Fig. 5. Photon transmission characteristics of thick filters.

Fig. 6. Differential photon transmission characteristics of thick filter pairs.

Fig. 7. Examples of semiconductor diode signal: (a) without proton/ion shielding; (b) with proton shielding by 560 μm thick Mylar foil.

Fig. 8. Example of outputs from individual channels of the Ross filter spectrometer in shots with and without proton/ion shielding.

Fig. 9. Electron spectra from shots without (red and green) and with (blue) the deflection magnetic field.

Fig. 10. Deflection of electrons by the magnetic yoke as a function of electron energy.

Fig. 11. Examples of IP signals behind the set of thin filters from the shot with 580 μm foam target and 66 J in the main pulse.

Fig. 12. Betatron radiation spectrum from a shot with a 580 μm thick foam target in the directions of 0° and 10°.

Fig. 13. Spectrum of betatron radiation in the directions of 0° and 10° evaluated with a help of thick filters.

Fig. 14. X-ray spectra for different 2 mg/cm³ foam thicknesses evaluated with the help of the thin filters set placed at 0° to the laser axis.

Fig. 15. X-ray spectra from shots evaluated with the help of the thick filters placed at 0° to the laser axis.

Fig. 16. Comparison of betatron radiation spectra from the experiments using thin filters (66 J, 580 μm foam) and thick filters (76 J, 470 μm) with the 3D-PIC simulation.