14 May 2015 Laser accelerated ions from near critical gaseous targets
Author Affiliations +
An intense laser pulse propagating through a near-critical density plasma is capable of generating a high peak current electron beam (~100kA) by means of a laser wakefield operating in the bubble regime. This beam drives surface currents on the sheath of the cavitation that produces large azithumal magnetic fields (~100 MG) and induces an on-axis electron current. These effects lead to a Z-pinch of the ambient plasma ions. Eventually the field confining the pinch relaxes and the ions explode radially due to self-repulsive forces. If this process occurs at a sharp exit gradient, the ions acquire some forward momentum consistent with the magnetic vortex acceleration mechanism. Fully 3D simulations indicate that the highest energy ions are emitted conically with a secondary lower energy ion beam accelerated on the axis.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. H. Helle, M. H. Helle, D. F. Gordon, D. F. Gordon, D. Kaganovich, D. Kaganovich, Y.-H. Chen, Y.-H. Chen, A. Ting, A. Ting, "Laser accelerated ions from near critical gaseous targets", Proc. SPIE 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III, 951409 (14 May 2015); doi: 10.1117/12.2178878; https://doi.org/10.1117/12.2178878

Back to Top