Speaker
Description
Laser power has increased into petawatt since the introduce of CPA, leading to many new fields including laser driven ion acceleration. Ions such as protons and deuterons can be accelerated into Multi-MeV by high power laser [1], leading to some applications such as compact neutron source [2,3], proton radiography [4]. For some further applications such as cancer therapy, researchers are trying to increase the ion max energy [4] and narrowing the ion energy width [5] both in experiments and theories. Several acceleration mechanisms by laser-target direct interaction have been reported, some of them indicate that ion beam with narrow energy width could be obtained, but they are experimentally difficult due to the strict requirements of laser and target conditions.
Here, we report an in-direct method which can obtain quasi-mono energetic deuteron beam easily in experiments. The experiments are conducted at ILE, Osaka University. A primary target (Al) is focused by LFEX laser, and electrons and protons are accelerated from it. A secondary target (heavy water capsule) is set at the normal direction after the primary target. By optimizing the experiment conditions such as the distance of the 2 targets and the size of the heavy water capsule, deuterons over 10 MeV with energy width less than 1 MeV can be accelerated from the capsule. The acceleration experiment details and its possible application to D-D neutron source will be discussed in the presentation.
[1] A. Yogo, et al. "Boosting laser-ion acceleration with multi-picosecond pulses." Scientific reports 7.1 (2017): 42451.
[2] A. Yogo, et al. "Laser-driven neutron generation realizing single-shot resonance
spectroscopy." Physical Review X 13.1 (2023): 011011.
[3] T. Wei, et al. "Non-destructive inspection of water or high-pressure hydrogen gas in metal pipes by the flash of neutrons and x rays generated by laser." AIP Advances 12.4 (2022):045220.
[4] B. Shi, et al. "Picosecond snapshot imaging of electric fields induced on a cone guide target designed for fast ignition scenario." Journal of Plasma Physics 88.4 (2022): 905880404.
[5] A Higginson, et al. "Near-100 MeV protons via a laser-driven transparency-enhanced hybrid acceleration scheme." Nature communications 9.1 (2018): 724.
[6] A. V. Brantov, et al. "Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse." Physics of plasmas 13.12 (2006): 122705.
