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首页> 外文期刊>Physical Review. Accelerators and Beams >Two-stage acceleration of protons from relativistic laser-solid interaction
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Two-stage acceleration of protons from relativistic laser-solid interaction

机译：相对论性激光与固体相互作用的质子两阶段加速

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A two-stage proton acceleration scheme using present-day intense lasers and a unique target design is proposed. The target system consists of a hollow cylinder with conical inner wall, which is followed by the main target with a flat front and a dishlike flared rear surface. At the center of the latter is a tapered proton layer, which is surrounded by side proton layers at an angle to it. In the first acceleration stage, protons in both layers are accelerated by target normal sheath acceleration. The center-layer protons are accelerated forward along the axis while the side protons are accelerated and focused towards them. As a result, the side-layer protons radially compress as well as axially further accelerate the front part of the center-layer protons in the second stage. Two-dimensional (2D) particle-in-cell (PIC) simulations show that a quasimonoenergetic proton bunch with the maximum energy over 250 MeV and energy spread $ensuremath{sim}17%$ can be generated when such a target is irradiated with an 80 fs laser pulse with focused intensity $3.1ifmmodeimeselseexttimesi{}{10}^{20}ext{ }ext{ }mathrm{W}/{mathrm{cm}}^{2}$. Three-dimensional (3D) PIC simulation gives the reduced maximum energy $ensuremath{sim}112ext{ }ext{ }mathrm{MeV}$ but even smaller energy spread $ensuremath{sim}3%$ under the same laser conditions due to anisotropic electron acceleration with linearly polarized lasers.
机译：提出了一种使用当今强激光和独特目标设计的两阶段质子加速方案。目标系统由带有圆锥形内壁的空心圆柱体组成，随后是具有平坦前表面和碟形喇叭形后表面的主目标。后者的中心是锥形质子层，该质子层与侧面的质子层成一定角度围绕。在第一个加速阶段，两层质子都通过目标法向护套加速而加速。中心层质子沿轴向前加速，而侧面质子则加速并聚焦于它们。结果，在第二阶段中，侧层质子径向地压缩并且轴向地进一步加速中心层质子的前部。二维（2D）单元内粒子（PIC）模拟显示，当辐照此类靶标时，可以生成具有超过250 MeV的最大能量和能量扩散$ ensuremath { sim} 17％$的准单能质子束聚焦强度为$ 3.1 ifmmode times else texttimes fi {} {10} ^ {20} text {} text {} mathrm {W} / { mathrm {cm}}的80 fs激光脉冲^ {2} $。三维（3D）PIC仿真可降低最大能量$ ensuremath { sim} 112 text {} text {} mathrm {MeV} $，但能量分布甚至更小$ ensuremath { sim} 3％$在相同的激光条件下，由于线性极化激光的各向异性电子加速作用。

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