The research on ion acceleration driven by high intensity laser pulse has attracted significant interests in recent decades due to the developments of laser technology. The intensive study of energetic ion bunches is particularly stimulated by wide applications in nuclear fusion, medical treatment, warm dense matter production and high energy density physics. However, to implement such compact accelerators, challenges are still existing in terms of beam quality and stability, especially in applications that require higher energy and narrow bandwidth spectra ion beams.
We report on the acceleration of quasi-mono-energetic ion beams via ionization dynamics in the interaction of an intense laser pulse with a solid target. Using ionization dynamics model in 2D particle-in-cell (PIC) simulations, we found that high charge state contamination ions can only be ionized in the central spot area where the intensity of sheath field surpasses their ionization threshold. These ions automatically form a microstructure target with a width of few micron scale, which is conducive to generate mono-energetic beams. In the experiment of ultraintense (< 10^21 W/cm^2) laser pulses irradiating ultrathin targets each attracted with a contamination layer of nm-thickness, high quality < 100 MeV mono-energetic ion bunches are generated. The peak energy of the self-generated micro-structured target ions with respect to different contamination layer thickness is also examined
This is relatively newfound respect, which is confirmed by the consistence between experiment data and the simulation results.
Chen Lin, I. Jong Kim, Jinqing Yu, Il Woo Choi, Wenjun Ma, Xueqing Yan, and Chang Hee Nam, "Generation of monoenergetic ion beams via ionization dynamics (Conference Presentation)," Proc. SPIE 10240, Laser Acceleration of Electrons, Protons, and Ions IV, 1024002 (Presented at SPIE Optics + Optoelectronics: April 24, 2017; Published: 9 June 2017); https://doi.org/10.1117/12.2267780.5463398609001.
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