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arXiv 2001.11398physics.plasm-phphysics.acc-ph
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强脉冲laser产生自旋极化质子束

Spin polarized proton beam generation from gas-jet targets by intense laser pulses

Luling Jin, Meng Wen, Xiaomei Zhang, Anna Hützen, Johannes Thomas, Markus Büscher, Baifei Shen

摘要:

提出了一种利用多拍瓦激光器从气体射流中产生自旋极化质子束的方法。利用现有的由光解卤化氢分子产生预极化单原子气体的技术和拍瓦激光器,可以获得能量约为50 MeV、极化度约为80%的质子束。本文采用完全自洽的三维粒子模拟方法,对质子的两级加速和自旋动力学进行了理论研究。我们的结果预测的光束偏振的驱动激光脉冲的强度的依赖关系。明亮的高能极化质子束的产生将打开一个领域的偏振研究与激光驱动的加速器,并有潜在的应用,使有效的探测量子色动力学的探索。

英文摘要:

A method of generating spin polarized proton beams from a gas jet by using a multi-petawatt laser is put forward. With currently available techniques of producing pre-polarized monatomic gases from photodissociated hydrogen halide molecules and petawatt lasers, proton beams with energy ~ 50 MeV and ~ 80 % polarization are proved to be obtained. Two-stage acceleration and spin dynamics of protons are investigated theoretically and by means of fully self-consistent three dimensional particle-in-cell simulations. Our results predict the dependence of the beam polarization on the intensity of the driving laser pulse. Generation of bright energetic polarized proton beams would open a domain of polarization studies with laser driven accelerators, and have potential application to enable effective detection in explorations of quantum chromodynamics.

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