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Phys. Rev. Lett. 100, 135003 (2008) [4 pages]

Generating High-Current Monoenergetic Proton Beams by a Circularly Polarized Laser Pulse in the Phase-StableAcceleration Regime

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X. Q. Yan (颜学庆)1,5,*, C. Lin (林晨)1, Z. M. Sheng (盛政明)1,2,3, Z. Y. Guo (郭之虞)1, B. C. Liu (刘必成)1,4, Y. R. Lu (陆元荣)1, J. X. Fang (方家驯)1, and J. E. Chen (陈佳洱)1
1State Key Laboratory of Nuclear Physics and Technology, Instituteof Heavy Ion Physics, Peking University, Beijing100871, China
2Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, CAS, Beijing 100080, China
3Department of Physics, Shanghai Jiao Tong University,Shanghai 200240, China
4The Graduate University of Chinese Academy ofScience, Beijing, China
5Center for Applied Physics and Technology, PekingUniversity, Beijing 100871, China

Received 24 October 2007; published 3 April 2008

A new ion acceleration method, namely, phase-stable acceleration, usingcircularly-polarized laser pulses is proposed. When the initial target density n0 and thickness D satisfy aL∼(n0/nc)D/λL and D>ls with aL, λL, ls, and nc the normalized laser amplitude, the laser wavelength invacuum, the plasma skin depth, and the critical density of the incident laserpulse, respectively, a quasiequilibrium for the electrons is established bythe light pressure and the space charge electrostatic field at the interactingfront of the laser pulse. The ions within the skin depth of the laser pulseare synchronously accelerated and bunched by the electrostatic field, andthereby a high-intensity monoenergetic proton beam can be generated. The protondynamics is investigated analytically and the results are verified by one-and two-dimensional particle-in-cell simulations.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.135003
DOI:
10.1103/PhysRevLett.100.135003
PACS:
52.38.Kd, 41.75.Jv, 52.35.Mw, 52.59.−f

*X.Yan@pku.edu.cn

See Also

Comment: Liangliang Ji, Baifei Shen, Xiaomei Zhang, Fengchao Wang, Zhangying Jin, Meng Wen, Wenpeng Wang, and Jiancai Xu, Comment on “Generating High-Current Monoenergetic Proton Beams by a Circularly Polarized Laser Pulse in the Phase-Stable Acceleration Regime”, Phys. Rev. Lett. 102, 239501 (2009).

Reply: X. Q. Yan, C. Lin, Z. M. Sheng, Z. Y. Guo, B. C. Liu, Y. R. Lu, J. X. Fang, and J. E. Chen, Yan et al. Reply:, Phys. Rev. Lett. 102, 239502 (2009).

 
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