Ashutosh Sharma, Zoltán Tibai, J Hebling, Jozsef Fulop,
http://iopscience.iop.org/article/10.1088/1361-6455/aadf50
A relativistic electron source is proposed, driven by the wake field of an intense terahertz (THz) pulse in low-density gas plasma. In contrast to the optical and near-infrared regimes, the low (3.5 THz) frequency and the long (λT = 85.6 µm) wavelength of the THz pulse offers distinct advantages, such as the λT2-scaling of the electron ponderomotive energy. Two-dimension-in-space and three-dimension-in-velocity particle-in-cell simulation results show that relativistic electrons of ~1 MeV energy and high charge can be generated by an intense THz pulse at kilohertz repetition rate from a gas plasma target. These results may lead to a new regime of applications, such as ultrafast electron diffraction or high-repetition-rate gamma ray sources for materials characterization or medical radiography, which would benefit from lower energy (1-10 MeV) but higher repetition rate (~1 kHz) sources of relativistic electrons.
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