期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.055001
关键词
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资金
- U.S. DOE/OFES [DE-SC0008827]
- Grants-in-Aid for Scientific Research [15K05368] Funding Source: KAKEN
A tailored-pulse-imploded core with a diameter of 70 mu m is flashed by counterirradiating 110 fs, 7 TW laser pulses. Photon emission (> 40 eV) from the core exceeds the emission from the imploded core by 6 times, even though the heating pulse energies are only one seventh of the implosion energy. The coupling efficiency from the heating laser to the core using counterirradiation is 14% from the enhancement of photon emission. Neutrons are also produced by counterpropagating fast deuterons accelerated by the photon pressure of the heating pulses. A collisional two-dimensional particle-in-cell simulation reveals that the collisionless two counterpropagating fast-electron currents induce mega-Gauss magnetic filaments in the center of the core due to the Weibel instability. The counterpropagating fast-electron currents are absolutely unstable and independent of the core density and resistivity. Fast electrons with energy below a few MeVare trapped by these filaments in the core region, inducing an additional coupling. This might lead to the observed bright photon emissions.
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