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Your search keyword '"Shao, F."' showing total 20 results
Start Over Author "Shao, F." Journal physics of plasmas
20 results on '"Shao, F."'

18. Propagation of attosecond electron bunches along the cone-and-channel target.

Author

Yang, X. H., Xu, H., Ma, Y. Y., Shao, F. Q., Yin, Y., Zhuo, H. B., Yu, M. Y., and Tian, C. L.

Subjects
ELECTRONS, SIMULATION methods & models, ACCELERATION (Mechanics), ELECTRIC fields, MAGNETIC fields, PULSE modulation, VACUUM technology
Abstract

Generation and propagation of attosecond electron bunches along a cone-and-channel target are investigated by particle-in-cell simulation. The target electrons are pulled out by the oscillating electric field of an intense laser pulse irradiating a cone target and accelerated forward along the cone walls. It is shown that the energetic electrons can be further guided and confined by a channel attached to the cone tip. The propagation of these electrons along the channel induces a strong quasistatic magnetic field as well as a sheath electric field since a part of the energetic electrons expands into the surrounding vacuum. The electromagnetic field in turn confines the surface currents. With the cone-and-channel target the energetic electrons can be much better collimated and propagate much farther than that from the classical cone target. [ABSTRACT FROM AUTHOR]

Published
2011
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19. High-quality MeV protons from laser interaction with umbrellalike cavity target.

Author

Ma, Y. Y., Sheng, Z. M., Gu, Y. Q., Yu, M. Y., Yin, Y., Shao, F. Q., Yu, T. P., and ChangA, W. W.

Subjects
PROTONS, ELECTROMAGNETIC fields, LASERS, SIMULATION methods & models, PARTICLE beams, PHYSICAL & theoretical chemistry
Abstract

A scheme for producing high-intensity collimated MeV protons from laser interaction with an umbrellalike (cone cavity with an axial filament stemming from the apex) target back side is investigated by two- and three-dimensional particle-in-cell simulations. The process is based on target-normal sheath acceleration. The characteristics of the proton beam are analyzed and compared to that from the recently proposed cone-shaped back side target. It is found that instead of diverging after first focusing, as in the cone-shaped target, the protons produced from the umbrellalike target are well collimated. The large transverse sheath electric field at TV/m level and the self-generated quasistatic magnetic field at hundreds of megagauss level around the filament play important roles in the collimation of the protons. [ABSTRACT FROM AUTHOR]

Published
2009
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20. Strong mid-infrared radiation from self-guided fast electron bunch propagating along a grated target surface in laser-solid interaction.

Author

Zhuo, H. B., Jin, Z., Yu, M. Y., Sheng, Z. M., Xu, H., Ma, Y. Y., Yin, Y., Shao, F. Q., Zhou, W. M., and Kodama, R.

Subjects
INFRARED radiation, THEORY of wave motion, ELECTRON beams, ELECTRON distribution, ULTRASHORT laser pulses, COMPUTER simulation, BRAGG gratings, MAGNETIC fields
Abstract

Generation of 1012 W/cm2 Smith-Purcell radiation in the infrared (5-20μm) regime from the interaction of high-density laser-produced MeV electrons is proposed. The electron bunch is produced by impinging an intense ultrashort laser pulse on a metallic target with a grated upper surface. Particle-in-cell simulation shows that the electron bunch can efficiently couple to the periodic structure through the quasistatic self-generated electric and magnetic fields there. An analytical model for predicting the dependence of the radiation intensity on the laser and grating parameters is also proposed. With appropriate laser and grating parameters, the proposed scheme provides a tunable source for intense radiation in the infrared regime. [ABSTRACT FROM AUTHOR]

Published
2012
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