Effect of sheath potential on electromagnetic radiation emitted from the rear surface of a metallic foil target |
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| Authors: | Zheng Jian Li Zhi-Chao Zhang Hui Yu Chang-Xuan Yabuuchi Toshinori and Tanaka Kazuo |
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| Affiliation: | Key Laboratory of Basic Plasma Physics, Chinese Academy of Sciences, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan |
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| Abstract: | In ultra-intense laser--matter interactions, intense electric fields
formed at the rear surface of a foil target may have strong
influences on the motion of energetic electrons, and thereby affect
the electromagnetic emissions from the rear surface, usually ascribed
to transition radiation. Due to the electric fields, transition
radiation occurs twice and bremsstrahlung radiation also happens
because the electrons will cross the rear surface twice and have
large accelerations. In the optic region, transition radiation is
dominant. The radiation spectrum depends on the electric field only
when the electrons are monochromatic, and becomes independent of the
electric field when the electrons have a broadband momentum
distribution. Therefore, in an actual experiment, the electric field
at the rear surface of a foil could not be studied just with the
measurement of optic emissions. In the terahertz region, both
bremsstrahlung and transition radiations should be taken into
account, and the radiation power could be enhanced in comparison with
that without the inclusion of bremsstrahlung radiation. The frequency
at which the maximum terahertz radiation appears depends on the
electric field. |
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| Keywords: | sheath potential transition
radiation bremsstrahlung radiation energetic electrons |
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