Analytical model for scattering effect of energetic charged-particle beam on radiography in steep density gradient region

Energetic charged-particle beams produced from ultrashort ultra-intense laser plasma interactions play a vital role in radiography. When such an energetic beam penetrates through foil target, its energy loss is negligible, and the main physics process small-angle scattering. owing to this scattering effect, radiography of target with transversely distributed steep density gradient region will produce modulation structure fluence distribution on detection plane, which can be used diagnose region. In past, theoretical work effect resulting was done Monte-Carlo simulations, costed lot computing time studied parameter range limited. present work, analytical model developed deal inside plane radiography, quickly results that coincide simulations very well. By using model, characteristics structures are analyzed. A dimensionless characteristic related conditions put forward, determines different also probability diagnosing width less than 2 μm.