Author: Zhang, A.L.
Paper Title Page
TUPH02
 The Emittance Measurement of Proton Beam in a Compact Laser Plasma Accelerator  
 
  • A.L. Zhang, Q. Liao, C. Lin, Wu,M.J. Wu, X. Xu, X.Q. Yan, J.G. Zhu
    PKU, Beijing, People's Republic of China
  
  A Compact Laser Plasma Accelerator (CLAPA) had been built at Institute of Heavy Ion physics of Peking University for application research of laser plasma accelerator. And multi-MeV proton beams produced by irradiating thin plastic foils with ultra-intense lasers has been measured. In order to qualify the proton beam, a pepper-pot emittance method was used to measure the transverse emittance. The pepper-pot was made of molybdenum and the picture was captured by RCF (Radio- Chromic Film). The measurement result shows that the emittance of the proton beam produced by CLAPA is much smaller than 0.1·π·mm·mrad.  
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WEAH3
 Proton Beam Line of Compact Laser Plasma Accelerator at Peking University  
 
  • J.G. Zhu, J.E. Chen, Q. Liao, C. Lin, H.Y. Lu, Y.R. Lu, W.J. Ma, Wu,M.J. Wu, X. Xu, X.Q. Yan, A.L. Zhang, Y.Y. Zhao, K. Zhu
    PKU, Beijing, People's Republic of China
  
  Funding: Supported by the National Natural Science Foundation of China under Grant No. 11575011, and National Grand Instrument Project under Grant No 2012YQ030142.
A proton-type of compact laser plasma accelerator (CLAPA) has been built at Peking University. Stable proton beams have been generated in the experiments of high intensity (8.3*1019 W/cm2) laser pulses irradiating on home-made sub-micrometer thick plastic targets. The temporal contrast of the laser pulse was 1010 at 100 ps before the main pulse with a cross-polarized wave (XPW) system, and no plasma mirror was used in CLAPA system. The maximum proton energy exceeded 15 MeV when using 1.2 um plastic targets. Proton beams with energy higher than 8.5 MeV were also detected with 20 nm thick plastic targets. A beam line that consists of common magnetic devices is also designed and built, aiming to deliver proton beams with energy of 1~44 MeV, energy spread of ±5% and 108 protons per pulse to the irradiation target platform. The parameters of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. In the preliminary CLAPA accelerator and beam line joint experiments, the effective transporting and focusing of accelerated protons with selected energy has been observed. 		 
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