Relativistic electron beam transport for fast ignition relevant scenarios

[摘要] (cont.) The second phase of transport was modeled analytically with the Vlasov-Krook-Maxwell formulation, which included collisional effects, various assumed theoretical distributions, and a data fit obtained from a simulation of the laser-plasma interaction. Our primary results indicated that collisions generally suppress growth but do tend to enhance filamentary instability growth at some wavelengths; however, due to the large temperature of the data fit, the overall growth rates are relatively small for fast ignition considerations. Analysis of the saturated regime, including particle orbits, revealed similar conclusions that instabilities can be safely neglected for fast ignition conditions, especially in the high density region of the fuel, which would otherwise need to resolved at great computational expense.

[发布机构] Massachusetts Institute of Technology