摘要
Ultrashort 10^22-10^24 W/cm^2 laser pulses will offer the possibility of producing monoenergetic electron beams in the Ge V - Te V level in the future. A laser-electron acceleration scheme is proposed by the interaction between a thin solid foil and an ultra-intense laser pulse for a0 ≥ 800σ0, where ao is the normalized laser field and σ0 is the normalized plasma surface density. The energy of the electrons as a function of time can be described by a simple model which indicates that an exponential relationship exists between the energy and the normalized time τ. A quasi-monoenergetic high density electron beam with 1.3 Ge V energy and a 2.2% energy spread has been predicted for a0 = 223.5 by particle-in-cell simulations. Characteristics of the ultra-high density electron layer formed in the early period of the acceleration are discussed.
Ultrashort 10^22-10^24 W/cm^2 laser pulses will offer the possibility of producing monoenergetic electron beams in the Ge V - Te V level in the future. A laser-electron acceleration scheme is proposed by the interaction between a thin solid foil and an ultra-intense laser pulse for a0 ≥ 800σ0, where ao is the normalized laser field and σ0 is the normalized plasma surface density. The energy of the electrons as a function of time can be described by a simple model which indicates that an exponential relationship exists between the energy and the normalized time τ. A quasi-monoenergetic high density electron beam with 1.3 Ge V energy and a 2.2% energy spread has been predicted for a0 = 223.5 by particle-in-cell simulations. Characteristics of the ultra-high density electron layer formed in the early period of the acceleration are discussed.
基金
Supported by the National Basic Research Program of China under Grant No 2011CB808104, and the National Natural Science Foundation of China under Grant Nos 11105233 and 11105234.
