München 2019 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Laser Plasmas II
P 10.3: Vortrag
Dienstag, 19. März 2019, 14:45–15:00, HS 20
Energy enhancement of the target surface electron by using a 200 TW sub-picosecond laser — •Jingyi Mao1, Olga Rosmej2, Liming Chen3, and Thomas Kuehl2 — 1Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China — 2GSI Helmholtzzentrum, Darmstadt 64291, Germany — 3Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Compared to the traditional initial confinement fusion (ICF) mechanism, fast ignition greatly lowers the demands of its experimental conditions. Ignition by target surface electrons (TSE) has many advantages[1]; for example, it can be driven by laser pulses, and the beam is of high charge, collimation and mono-energetic property. In our recent work[2], one order of magnitude energy enhancement of the target surface electron beams with central energy at 11.5 MeV is achieved by using a 200 TW, 500 fs laser at an incident angle of 72° with a prepulse intensity ratio of 5x10E(-6). The experimental results demonstrate the scalability of the acceleration process to high electron energy with a longer (sub-picosecond) laser pulse duration and a higher laser energy (120 J). The total charge of the beam is around 400 pC (E>2.7 MeV). Such a high orientation and mono-energetic electron jet would be a good method to solve the problem of the large beam divergence in fast ignition schemes and to increase the laser energy deposition on the target core. [1]J. Y. Mao et al., Phys. Rev. E. 85, 025401 (R) (2012); J. Y. Mao et al., Appl. Phys. Lett. 106, 1311058 (2015). [2]J. Y. Mao et al., Opt. Lett. 43, 3909 (2018).