超短激光脉冲与近临界密度射流相互作用的离子加速度

论文标题

超短激光脉冲与近临界密度射流相互作用的离子加速度

Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet

论文作者

Ehret, M., Salgado-Lopez, C., Ospina-Bohorquez, V., Perez-Hernandez, J. A., Huault, M., de Marco, M., Apinaniz, J. I., Hannachi, F., De Luis, D., Toro, J. Hernandez, Arana, D., Mendez, C., Varela, O., Debayle, A., Gremillet, L., Nguyen-Bui, T. -H., Olivier, E., Revet, G., Bukharskii, N. D., Larreur, H., Caron, J., Vlachos, C., Ceccotti, T., Raffestin, D., Nicolai, P., Feugeas, J. L., Roth, M., Vaisseau, X., Gatti, G., Volpe, L., Santos, J. J.

论文摘要

我们展示了激光驱动的氦离子加速度，截止能量高于25 meV，而峰值离子数则超过$ 10^8 $ /meV，对于22（2）个MEV弹丸，来自近临界密度密度射流目标。我们在高重复速率（HRR）VEGA-2激光系统上使用了冲击气喷嘴，在30 fs的脉冲中使用3 j，重点放在$ 9 \ times10^{19} $ w/cm $ $ $ $ $^2 $和$ 1.2 \ times10^times10^{20} {20} $ W/cm $ w/cm $^2 $之间。我们展示了与目标气体密度曲线中较小变化的较小射击变化的加速光谱。由于喷嘴暴露于实验环境，部分消融和融化而产生的气体曲线差异。

We demonstrate laser-driven Helium ion acceleration with cut-off energies above 25 MeV and peaked ion number above $10^8$ /MeV for 22(2) MeV projectiles from near-critical density gas jet targets. We employed shock gas jet nozzles at the high-repetition-rate (HRR) VEGA-2 laser system with 3 J in pulses of 30 fs focused down to intensities in the range between $9\times10^{19}$ W/cm$^2$ and $1.2\times10^{20}$ W/cm$^2$. We demonstrate acceleration spectra with minor shot-to-shot changes for small variations in the target gas density profile. Difference in gas profiles arise due to nozzles being exposed to a experimental environment, partially ablating and melting.

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