Hollow screw like drill in plasma using an intense Laguerre Gaussian   laser
  With the development of ultra intense laser technology, MeV ions from the laser foil interaction have been obtained by different mechanisms, such as target normal sheath acceleration, radiation pressure acceleration, collisionless shock acceleration, breakout afterburner, and a combination of different mechanisms. These energetic ion beams can be applied in fast ignition for inertial confinement fusion, medical therapy, and proton imaging. However, these ions are mainly accelerated in the laser propagation direction, and the ion acceleration in an azimuthal orientation is scarcely mentioned. Here, a doughnut Laguerre Gaussian LG laser is used for the first time to study the laser plasma interaction in the relativistic intensity regime in three dimensional particle in cell simulations. Studies have shown that a novel rotation of the plasma is produced from the hollow screw like drill of a LG mode laser. The angular momentum of the protons in the longitudinal direction produced by the LG laser is remarkably enhanced compared with that produced by the usual laser pulses, such as linearly and circularly polarized gaussian pulses. Moreover, the particles, including electrons and ions, can be trapped and uniformly compressed in the dark central minimum of the doughnut LG pulse. Such hollow structured LG laser may be used to investigate some difficult problems, such as screw like drilling in the inertial confinement fusion, laser driven particle accelerations, and pulsars in the astrophysical environment. 
Wenpeng Wang, Baifei Shen, Xiaomei Zhang, Lingang Zhang, Yin Shi,   Zhizhan Xu
physics.plasm-ph