We propose to use intense optical vortex to control laser-based ion acceleration for obtaining high-quality ion beams. An acceleration field favorable for generating well-collimated energetic proton beams results from the interaction of a tailored vortex laser pulse with thin solid-density foil in a blowout regime. Three-dimensional particle-in-cell simulations show that the foil protons can be efficiently accelerated to the GeV level in the form of a beam with small radius (<1μm), narrow divergence (<0.1 rad), and low emittance (∼0.004π mm mrad). The proton beam is of high energy density (>10¹⁸ J m⁻³) and high brightness (>10²² A m⁻² rad⁻²), exceeding that of the Gaussian laser case by four orders of magnitude, and the energy conversion efficiency is about 12 times that under the same laser intensity. The scheme can also be used to accelerate heavier, such as carbon, ions. The resulting ion beams should be useful as compact neutron source, for creation of warm dense matters, as well as ion-beam direct and indirect drive inertial confinement fusion, ultrafast diagnostics of the implosion dynamics in the latter, etc.

我们建议使用强烈的光学涡流来控制基于激光的离子加速以获得高质量的离子束。有利于产生准直的高能质子束的加速场是由定制涡旋激光脉冲与薄固体密度箔在井喷状态下的相互作用产生的。三维粒子胞内模拟表明，箔质子可以以小半径 (<1 μ m)、窄发散 (<0.1 rad) 和低发射率的光束形式有效加速到 GeV 水平。∼0.004 π mm mrad)。质子束具有高能量密度（>10 ¹⁸ J m ^-3）和高亮度（>10 ²² A m ^-2 rad ^-2)，超过高斯激光情况4个数量级，能量转换效率是相同激光强度下的12倍左右。该方案还可用于加速较重的，如碳、离子。由此产生的离子束应该可用作紧凑的中子源，用于产生温暖的致密物质，以及离子束直接和间接驱动惯性约束聚变，后者内爆动力学的超快速诊断等。