1. Tree-code simulations of proton acceleration from laser-irradiated wire targets
- Author
-
Gibbon, P., Beg, F. N., Wei, M. S., Clark, E. L., Evans, R. G., and Zepf, M.
- Subjects
Physics ,Proton ,Series (mathematics) ,Electron ,Plasma ,Condensed Matter Physics ,Laser ,Computational physics ,law.invention ,Acceleration ,Complex geometry ,law ,ddc:530 ,Boundary value problem ,Atomic physics - Abstract
Recent experiments using Terawatt lasers to accelerate protons deposited on thin wire targets are modeled with a new type of gridless plasma simulation code. In contrast to conventional mesh-based methods, this technique offers a unique capability in emulating the complex geometry and open-ended boundary conditions characteristic of contemporary experimental conditions. Comparisons of ion acceleration are made between the tree code and standard particle-in-cell simulations for a typical collisionless "hole boring" scenario in slab geometry. The utility of the gridless approach is emphasized by a series of simulations in "wire" geometry, in which electrons are permitted to circulate around the target at arbitrary distances from the focal region. The simulations reveal a number of features in common with recent experimental observations, including a disclike emission pattern of the MeV protons accelerated away from the wire. (C) 2004 American Institute of Physics.
- Published
- 2004