Validating the Predicted Lateral Straggling of MeV-Energy Proton Beams

[摘要] Proton imaging is a potential nondestructive method for characterizing NIF (National Ignition Facility) targets in two- and three-dimensions with micron-scale spatial resolution. The main limitation for high resolution imaging with proton beams, especially for thick samples, is the positional blurring of the proton beam, known as ''lateral straggling''. Accurate prediction of the amount of lateral straggling and, consequently, the achievable spatial resolution in pertinent NIF target material combinations and geometries requires validated proton transport models. We present results of Monte Carlo simulations of MeV-energy proton transport through thin ({approx}1 micron thick) metal foils. The calculated residual proton distributions are compared to recent lateral straggling measurements obtained at the LLNL 4-MV Pelletron accelerator.

[发布日期] 2003-11-20 [发布机构] Lawrence Livermore National Laboratory

[关键词] Lawrence Livermore National Laboratory;Protons;Forecasting;43 Particle Accelerators;Pelletron Accelerators