Development of Filter Stack Spectrometer for Spectrum Measurement of X Ray Generated by Laser

To measure the spectra of intense pulsed X ray generated in laser target interaction, a filter stack spectrometer composed of metal filters and image plates with different materials and thicknesses was developed. A code based on Greval algorithm was developed to unfold the spectra from measured data. The response function was calculated with Monte Carlo simulation code Geant4. This spectrometer was tested in a picosecond laser-solid target experiment at XG Ⅲ laser facility and the bremsstrahlung spectra from 10 keV to 3 MeV were obtained. The result shows that the spectrometer is reliable.