X. F. Shen

Universal power-law spectral feature in laser-driven proton acceleration

S. Jiang, X. F. Shen, Olga N. Rosmej, S. P. Zhu et autres

Quasimonoenergetic proton beams have long been anticipated in laser-driven ion acceleration, particularly via multispecies targets in radiation pressure and target normal sheath acceleration, yet experimental results are far from expectations, and the underlying cause remains elusive. Here we reveal that even under …

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Coherent radiation of multielectron wave packets in intense laser fields

Dejia Dai, X. F. Shen, Bin Qiao

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Anomalous lepton acceleration in the radiation reaction dominated reflection regime

X. F. Shen, Yue-Yue Chen, Karen Z. Hatsagortsyan, Christoph H. Keitel

Relativistic electrons colliding with intense counterpropagating laser pulses are expected to lose energy through radiation reaction. However, we reveal a counterintuitive regime where reflected leptons (including incident electrons, generated electrons, and positrons) gain significant energies when an ultraintense laser pulse interacts with …

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Generation of ultrarelativistic longitudinally spin-polarized electrons via nonlinear Compton scattering

Dejia Dai, X. F. Shen, Bin Qiao

The spin polarization of electrons in strong laser fields, an important phenomenon predicted by strong-field quantum electrodynamics, has garnered considerable attention in recent years due to its broad potential applications. In the present work we investigate the collision dynamics between multi-GeV electrons …

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High-flux neutron source from deuterons accelerated by subpicosecond laser-driven collisionless shock in gas cell targets

WU Zhen-bo, Y. L. Yao, X. F. Shen, Tao Ye et autres

Abstract A novel scheme for generating high-flux neutron beams via collisionless shock acceleration is proposed, where a subpicosecond laser pulse interacts with a practical gas cell target composed of uniform deuteron gas and a solid foil covering the front of the cell. …

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Generation of tunable relativistic bichromatic counterrotating circularly-polarized laser pulses

Lijun Yang, X. F. Shen, A. D. Liu, X. T. He et autres

Abstract Circularly-polarized (CP) high harmonics (HHs) are pivotal for investigating chirality-sensitive light-matter interactions. While bichromatic counterrotating (BC) CP lasers have proved effective in diverse applications, particularly in producing CP HHs, their generation at relativistic intensities remains challenging because of the damage threshold …

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Anomalous lepton acceleration in the radiation reaction dominated reflection regime

X. F. Shen, Yue-Yue Chen, Karen Z. Hatsagortsyan, Christoph H. Keitel

Relativistic electrons colliding with intense counterpropagating laser pulses are expected to lose energy through radiation reaction. However, we reveal a counterintuitive regime where reflected leptons (including incident electrons, generated electrons, and positrons) gain significant energies when an ultraintense laser pulse interacts with …

Association of the dietary index for gut microbiota with sleep disorder among US adults: the mediation effect of dietary inflammation index

Yingying Li, Fang Pan, X. F. Shen

Background Previous studies have confirmed the relationship between gut microbiota and sleep disorders, characterized by the persistent inability to achieve adequate sleep, with dietary composition playing a key role in maintaining microbiota homeostasis. Our study aims to explore the relationship between the …

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Study of the atmospheric neutron radiation effects using compact laser-driven spallation neutron source

WU Zhen-bo, Yilin Yao, X. F. Shen, Kefan Li et autres

We propose a laboratory accelerated test method for study of the atmospheric neutron radiation effects by using a compact laser-driven spallation neutron source (LDSNS). The LDSNS is obtained by injecting a GeV quasimonoenergetic proton beam accelerated by light-sail (LS) radiation pressure of …

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Design of a compact beam transport system for laser-driven proton therapy

Yangfan Li, X. F. Shen, Yilin Yao, Bin Qiao

Abstract We put forward a new design of a compact beam transport system for intense laser-driven proton therapy, where instead of using conventional pulsed solenoids, our design relies on a helical coil irradiated by a nanosecond laser pulse to generate strong magnetic …

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Acceleration of Electrons upon Interaction of Laser Pulses with Solid Targets in the Laser Peeler Regime

S. E. Perevalov, A. V. Kotov, Roman S. Zemskov, Konstantin F. Burdonov et autres

Abstract We performed an experiment on the acceleration of electrons in the laser peeler regime during the interaction of a focused subpetawatt laser pulses with solid-state targets. Electrons with energies up to 70 MeV were produced, and their directional pattern was determined. …

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Highly polarized energetic electrons via intense laser-irradiated tailored targets

X. F. Shen, Zheng Gong, Karen Z. Hatsagortsyan, Christoph H. Keitel

A method for the generation of ultrarelativistic electron beams with high spin polarization is put forward, where a tightly focused linearly polarized ultraintense laser pulse interacts with a nonprepolarized transverse-size-tailored solid target. The radiative spin polarization and angular separation is facilitated by …

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