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2 results on '"Hairong Shang"'

1. Laser-Driven Coherent Betatron Oscillation in a Laser-Wakefield Cavity: Formation of Sinusoid Beam Shapes and Coherent Trajectories.

Author

Németh, Károly, Baifei Shen, Yuelin Li, Hairong Shang, Crowell, Robert, Harkay, Katherine C., and Cary, John R.

Subjects
*LASERS, *BETATRON oscillations, *ELECTRON accelerators, *TRAJECTORIES (Mechanics), *ELECTRON beams, *AMPLITUDE modulation
Abstract

High amplitude coherent electron-trajectories have been seen in 3D particle-in-cell simulations of the colliding pulse injection scheme of laser-wakefield accelerators in the bubble regime, and explained as a consequence of laser-driven coherent betatron oscillation in our recent paper [K. Németh et al., Phys. Rev. Lett. 100, 095002 (2008)]. In the present paper we provide more details on the shape of the trajectories, their relationship to the phase velocity of the laser and indicate the dependence of the phenomenon on the accuracy of the numerical representation and choice of laser/plasma parameters. [ABSTRACT FROM AUTHOR]

Published
2009
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2. Electron injection by a nanowire in the bubble regime.

Author

Baifei Shen, Yuelin Li, Nemeth, Karoly, Hairong Shang, Yong-chul Chae, Soliday, Robert, Crowell, Robert, Frank, Edward, Gropp, William, and Cary, John

Subjects
*NANOWIRES, *PLASMA gases, *LASER plasmas, *LASER beams, *COULOMB potential, *ELECTRIC fields, *ELECTRON beams
Abstract

The triggering of wave-breaking in a three-dimensional laser plasma wake (bubble) is investigated. The Coulomb potential from a nanowire is used to disturb the wake field to initialize the wave-breaking. The electron acceleration becomes more stable and the laser power needed for self-trapping is lowered. Three-dimensional particle-in-cell simulations were performed. Electrons with a charge of about 100 pC can be accelerated stably to energy about 170 MeV with a laser energy of 460 mJ. The first step towards tailoring the electron beam properties such as the energy, energy spread, and charge is discussed. [ABSTRACT FROM AUTHOR]

Published
2007
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