Baifei Shen

Energetic helical electron-bunch generation driven by a light spring wakefield

Rongxuan Liu, Xiaomei Zhang, Yuanxin Chang, Jicheng Liu et autres

This paper investigates the interaction between a light spring pulse and a gaseous plasma, resulting in the formation of a three-dimensional helical wakefield and the generation of a high-energy helical electron beam carrying orbital angular momentum (OAM).During this process, the ponderomotive force …

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Supplementary document for Reflection of spatiotemporal optical vortex from relativistic flying mirror - 7951999.pdf

SiGui Wu, Baifei Shen, Xiaomei Zhang, Xiaolong Zheng et autres

Derivation of the Lorentz Transformation of the Angular Momentum Tensor. Derivation Note on the Consistency between the Poynting-Momentum and Canonical-Momentum Approaches for STOV Orbital Angular Momentum

Reflectionofspatiotemporalopticalvortexfroma relativisticflyingmirror

SiGui Wu, Baifei Shen, Xiaomei Zhang, Xiaolong Zheng et autres

In this study, the change in the angular momentum of a spatiotemporal optical vortex beam (STOV) after reflection by a relativistic flying mirror was investigated using theoretical analysis and particle-in-cell simulations. Unlike longitudinal AM in vortex beams, the transverse AM of the …

Reflectionofspatiotemporalopticalvortexfroma relativisticflyingmirror

SiGui Wu, Baifei Shen, Xiaomei Zhang, Xiaolong Zheng et autres

In this study, the change in the angular momentum of a spatiotemporal optical vortex beam (STOV) after reflection by a relativistic flying mirror was investigated using theoretical analysis and particle-in-cell simulations. Unlike longitudinal AM in vortex beams, the transverse AM of the …

Supplementary document for Reflection of spatiotemporal optical vortex from relativistic flying mirror - 7951999.pdf

SiGui Wu, Baifei Shen, Xiaomei Zhang, Xiaolong Zheng et autres

Derivation of the Lorentz Transformation of the Angular Momentum Tensor. Derivation Note on the Consistency between the Poynting-Momentum and Canonical-Momentum Approaches for STOV Orbital Angular Momentum

Reflection of a spatiotemporal optical vortex from a relativistic flying mirror

SiGui Wu, Baifei Shen, Xiaomei Zhang, Xiaolong Zheng et autres

In this study, the change in the angular momentum of a spatiotemporal optical vortex beam (STOV) after reflection by a relativistic flying mirror was investigated using theoretical analysis and particle-in-cell simulations. Unlike longitudinal AM in vortex beams, the transverse AM of the …

Transition Radiation Field Enhanced Laser Proton Acceleration Employing Near-Critical-Density Foam

C. Y. Qin, Xuesong Geng, H. Zhang, L J Yu et autres

Abstract Laser-driven protons with ultrafast temporal properties attract great interest in fields ranging from flash radiation oncology to compact accelerators. High-efficiency energy coupling of protons from laser-induced accelerating fields is complex, hybrid acceleration mechanisms that combine multiple field contributions prove critical for …

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Spin-dependent axion generation with controllable emission angles in strong-laser fields

Jia-Ding Chen, Hang Liu, Kai-Hong Zhuang, Baifei Shen et autres

We investigate axion production in the collision between a spin-polarized relativistic electron beam and an ultraintense laser pulse. A spin-resolved Monte Carlo framework is developed to model axion-electron and axion-photon couplings in arbitrary electromagnetic fields, using quantum emission probabilities under the local …

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Generation of gamma photons carrying transverse orbital angular momentum driven by a spatiotemporal optical vortex laser

Xiaomei Zhang, Baifei Shen, Mingyuan Yang, Xiaofei Li et autres

The generation of high-energy gamma photons carrying transverse orbital angular momentum (OAM) has been investigated by interacting an intense spatiotemporal optical vortex (STOV) laser with a solid target. The energy and transverse OAM of the STOV laser are first transferred to electrons, …

Strong coupling of virtual negative states in the Kapitza-Dirac effect

Qianlong Wang, Sven Ahrens, Baifei Shen

Negative states are an intrinsic property of relativistic quantum theory and related to anti-particles in the context of the Dirac sea concept. We show that negative states can dominantly contribute to the diffraction amplitude in the quantum dynamics of the two-photon Kapitza-Dirac …

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Enhanced electron injection for efficient proton acceleration and neutron production in femtosecond laser-driven nano-structured targets

Yingzi Dai, Chengyu Qin, Hui Zhang, Guoqiang Zhang et autres

Micro- or nano-structured targets are advantageous in enhancing and manipulating laser-proton acceleration, due to the increased absorption of laser energy and onset of direct laser acceleration for high-energy electrons. Here, we experimentally demonstrate that nano-wire-array printed on a flat substrate is an …

Enhanced electron injection for efficient proton acceleration and neutron production in femtosecond laser-driven nano-structured targets

Yingzi Dai, Chengyu Qin, Hui Zhang, Guoqiang Zhang et autres

Micro- or nano-structured targets are advantageous in enhancing and manipulating laser-proton acceleration, due to the increased absorption of laser energy and onset of direct laser acceleration for high-energy electrons. Here, we experimentally demonstrate that nano-wire-array printed on a flat substrate is an …