The Effect of Density Gradient on the Self-modulated Laser Wakefield Acceleration with Relativistic and Kinetic Effects
- Authors
- Yoo, Seung Hoon; Kim, Jaehoon; Kim, Jong Uk; Seo, Ju Tae; Hahn, Sang June
- Issue Date
- Mar-2009
- Publisher
- OPTICAL SOC KOREA
- Keywords
- Self-modulated laser wakefield acceleration; Density gradient; Relativistic effect; Kinetic effect; Electron dephasing
- Citation
- JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.13, no.1, pp 42 - 47
- Pages
- 6
- Journal Title
- JOURNAL OF THE OPTICAL SOCIETY OF KOREA
- Volume
- 13
- Number
- 1
- Start Page
- 42
- End Page
- 47
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/23286
- DOI
- 10.3807/JOSK.2009.13.1.042
- ISSN
- 1226-4776
2093-6885
- Abstract
- The propagation of an intense laser pulse through an upward density-gradient plasma in a self-modulated laser wakefield acceleration (SM-LWFA) is investigated by using particle-in-cell (PIC) simulations. In the fully relativistic and kinetic PIC simulations, the relativistic and kinetic effects including Landau damping enhance the electron dephasing. This electron dephasing is the most important factor for limiting the energy of accelerated electrons. However, the electron dephasing, which is enhanced by relativistic and kinetic effects in the homogeneous plasma, can be forestalled through the detuning process arising from the longitudinal density gradient. Simulation results Show that the detuning process can effectively maintain the coherence of the laser wake wave in the spatiotemporal wakefield pattern, hence considerable energy enhancement is achievable. The spatiotemporal profiles axe analyzed for the detailed study on the relativistic and kinetic effects. In this paper, the optimum slope of the density gradient for increasing electron energy is presented for various laser intensities.
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