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Exploring novel target structures for manipulating relativistic laser–plasma interaction

High Power Laser Science and Engineering 2017年第2期5卷 63-71页

作者： Liangliang Ji Sheng Jiang alexander pukhov Richard Freeman Kramer Akli physics Department The Ohio State UniversityColumbusOH 43210USA State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Collaborative Innovation Center oflFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China Institut fur Theoretische PhysikⅠ Heinrieh-Heine-Universitat Dusseldorf40225 DusseldorfGermany

The improved laser-to-pedestal contrast ratio enabled by current high-power laser pulse cleaning techniques allows the fine features of the target survive before the main laser pulse arrives. We propose to introduce the nano-fabrication technologies into laser–plasma interaction to explore the novel effects of micro-structures. We found out that not only laser-driven particle sources but also the laser pulse itself can be manipulated by specifically designed micro-cylinder and-tube targets, respectively. The proposal was supported by full-3D particle-in-cell simulations and successful proofof-principle experiments for the first time. We believe this would open a way to manipulate relativistic laser–plasma interaction at the micro-size level.

关键词： electron acceleration laser–plasma interaction micro-structured targets

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Bright Betatronlike X Rays from Radiation Pressure Acceleration of a Mass-Limited Foil Target

Bright Betatronlike X Rays from Radiation Pressure Accelerat...

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第七届全国青年计算物理学术会议

作者：余同普 alexander pukhov 盛政明刘峰 Gennady Shvets Department of Physics National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology Institut für Theoretische Physik I Heinrich-Heine-Universitt Düsseldorf Institut für Theoretische Physik I Heinrich-Heine-Universitt Düsseldorf Key Laboratory for Laser Plasmas(MoE) and Department of Physics Shanghai Jiao Tong University Institut für Laser-und Plasmaphysik Heinrich-Heine-Universitt Düsseldorf Department of Physics The University of Texas at Austin

By using multidimensional particle-in-cell simulations, we study the electromagnetic emission from radiation pressure acceleration of ultrathin mass-limited foils. When a circularly polarized laser pulse irradiates the foil, the laser radiation pressure pushes the foil forward as a whole. The outer wings of the pulse continue to propagate and act as a natural undulator. Electrons move together with ions longitudinally but oscillate around the latter transversely, forming a self-organized helical electron bunch. When the electron oscillation frequency coincides with the laser frequency as witnessed by the electron,betatronlike resonance occurs. The emitted x rays by the resonant electrons have high brightness, short durations, and broad band ranges which may have diverse applications.

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Polarized proton beams from laser-induced plasmas

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High Power Laser Science and Engineering 2019年第1期7卷 114-119页

作者： Anna Hützen Johannes Thomas Jürgen B?ker Ralf Engels Ralf Gebel Andreas Lehrach alexander pukhov T.Peter Rakitzis Dimitris Sofikitis Markus Büscher Peter Grünberg Institut (PGI-6) Forschungszentrum Jülich Institut für Laser-und Plasmaphysik Heinrich-Heine-Universit?t Düsseldorf Institut für Theoretische Physik I Heinrich-Heine-Universit?t Düsseldorf Institut für Kernphysik (IKP-4) Forschungszentrum Jülich Institut für Kernphysik (IKP-2) Forschungszentrum Jülich JARA-FAME und III.Physikalisches Institut B RWTH Aachen Department of Physics University of Crete Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas

We report on the concept of an innovative source to produce polarized proton/deuteron beams of a kinetic energy up to several GeV from a laser-driven plasma accelerator. Spin effects have been implemented into the particle-in-cell(PIC) simulation code VLPL(Virtual Laser Plasma Lab) to make theoretical predictions about the behavior of proton spins in laser-induced plasmas. Simulations of spin-polarized targets show that the polarization is conserved during the acceleration process. For the experimental realization, a polarized HCl gas-jet target is under construction using the fundamental wavelength of a Nd:YAG laser system to align the HCl bonds and simultaneously circularly polarized light of the fifth harmonic to photo-dissociate, yielding nuclear polarized H atoms. Subsequently, their degree of polarization is measured with a Lamb-shift polarimeter. The final experiments, aiming at the first observation of a polarized particle beam from laser-generated plasmas, will be carried out at the 10 PW laser system SULF at SIOM, Shanghai.

关键词： laser-driven plasma accelerator particle-in-cell simulations polarized gas-jet target polarized proton beams

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