Application of Robertson's Collective Focusing to Final Focusing

摘要

Recently Robertson suggested that a collective focusing scheme might be useful in the final focusing problem for Heavy Ion Fusion. He demonstrates that it is possible to focus a charge and current neutralized beam, and shows this scheme is applicable since HIF scenarios have current requirements smaller than the electron Alfven current. In this note ion emittance is included in the analysis of such lenses. It is found that one can focus an acceptable fraction of the beam, provided the current density is large enough. (ERA citation 08:011498)