Murakami M, Arefiev A, Zosa M A
Institute of Laser Engineering, Osaka University, Osaka, 565-0871, Japan.
UC San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0411, USA.
Sci Rep. 2018 May 24;8(1):7537. doi: 10.1038/s41598-018-25594-3.
Breaking the 100-MeV barrier for proton acceleration will help elucidate fundamental physics and advance practical applications from inertial confinement fusion to tumour therapy. Herein we propose a novel concept of bubble implosions. A bubble implosion combines micro-bubbles and ultraintense laser pulses of 10-10 W cm to generate ultrahigh fields and relativistic protons. The bubble wall protons undergo volumetric acceleration toward the centre due to the spherically symmetric Coulomb force and the innermost protons accumulate at the centre with a density comparable to the interior of a white dwarf. Then an unprecedentedly high electric field is formed, which produces an energetic proton flash. Three-dimensional particle simulations confirm the robustness of Coulomb-imploded bubbles, which behave as nano-pulsars with repeated implosions and explosions to emit protons. Current technologies should be sufficient to experimentally verify concept of bubble implosions.
突破质子加速的100兆电子伏特障碍将有助于阐明基础物理学，并推动从惯性约束聚变到肿瘤治疗等实际应用的发展。在此，我们提出了一种气泡内爆的新概念。气泡内爆将微气泡与10-10瓦/平方厘米的超强激光脉冲相结合，以产生超高场和相对论质子。由于球对称库仑力，气泡壁质子向中心进行体积加速，最内层的质子在中心积累，其密度与白矮星内部相当。然后形成一个前所未有的高电场，产生高能质子闪光。三维粒子模拟证实了库仑内爆气泡的稳健性，这些气泡表现为具有重复内爆和爆炸以发射质子的纳米脉冲星。当前技术应该足以通过实验验证气泡内爆的概念。
