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首页> 外文期刊>Physics of plasmas >High-quality proton bunch from laser interaction with a gas-filled cone target
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High-quality proton bunch from laser interaction with a gas-filled cone target

机译：激光与充气锥靶相互作用产生的高质量质子束

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摘要

Generation of high-energy proton bunch from interaction of an intense short circularly polarized (CP) laser pulse with a gas-filled cone target (GCT) is investigated using two-dimensional particle-in-cell simulation. The GCT target consists of a hollow cone filled with near-critical gas-plasma and a thin foil attached to the tip of the cone. It is observed that as the laser pulse propagates in the gas-plasma, the nonlinear focusing will result in an enhancement of the laser pulse intensity. It is shown that a large number of energetic electrons are generated from the gas-plasma and accelerated by the self-focused laser pulse. The energetic electrons then transports through the foil, forming a backside sheath field which is stronger than that produced by a simple planar target. A quasi-monoenergetic proton beam with maximum energy of 181 MeV is produced from this GCT target irradiated by a CP laser pulse at an intensity of 2.6 × 10~(20) Wcm~2, which is nearly three times higher compared to simple planar target (67 MeV).
机译：使用二维粒子模拟研究了强短圆偏振（CP）激光脉冲与充气锥靶（GCT）相互作用产生的高能质子束。 GCT目标包括一个充满接近临界气体等离子体的空心锥和一个附着在锥尖上的薄箔。可以观察到，随着激光脉冲在等离子体中的传播，非线性聚焦将导致激光脉冲强度的增强。结果表明，大量的高能电子从气体等离子体中产生并通过自聚焦激光脉冲加速。然后，高能电子传输通过箔，形成比简单平面靶所产生的电场强的背面鞘层场。用CP激光脉冲以2.6×10〜（20）Wcm〜2的强度照射该GCT靶，产生最大能量为181 MeV的准单能质子束，比简单的平面靶高近三倍（67 MeV）。

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