Collective Focusing of Intense Ion Beam Pulses for High-energy Density Physics Applications

Mikhail A. Dorf, Igor D. Kaganovich, Edward A. Startsev and Ronald C. Davidson

Princeton University. Plasma Physics Laboratory.

关键词: Compression;    Magnetic Fields;    70 Plasma Physics And Fusion Technology;    Beam Neutralization;    Ion Beams;   

RP-ID  :  PPPL-4615
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  1013056

美国|英语

来源: UNT Digital Library

【 摘 要 】

The collective focusing concept in which a weak magnetic lens provides strong focusing of an intense ion beam pulse carrying a neutralizing electron background is investigated by making use of advanced particle-in-cell simulations and reduced analytical models. The original analysis by Robertson Phys. Rev. Lett. 48, 149 (1982) is extended to the parameter regimes of particular importance for several high-energy density physics applications. The present paper investigates (1) the effects of non-neutral collective focusing in a moderately strong magnetic field; (2) the diamagnetic effects leading to suppression of the applied magnetic field due to the presence of the beam pulse; and (3) the influence of a finite-radius conducting wall surrounding the beam cross-section on beam neutralization. In addition, it is demonstrated that the use of the collective focusing lens can significantly simplify the technical realization of the final focusing of ion beam pulses in the Neutralized Drift Compression Experiment-I (NDCX-I) , and the conceptual designs of possible experiments on NDCX-I are investigated by making use of advanced numerical simulations. 2011 American Institute of Physics