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arxiv 1411.5933 v1 pith:IK5VIDPQ submitted 2014-11-18 physics.plasm-ph

Proton radiography of magnetic field produced by ultra-intense laser irradiating capacity-coil target

W. W. Wang , J. Teng , J. Chen , H. B. Cai , S. K. He , W. M. Zhou , L. Q. Shan , F. Lu
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Y. C. Wu W. Hong D. X. Liu B. Bi F. Zhang F. B. Xue B. Y. Li B. Zhang Y. L. He W. He J. L. Jiao K. G. Dong F. Q. Zhang Z. G. Deng Z. M. Zhang B. Cui D. Han K. N. Zhou X. D. Wang Z. Q. Zhao L. F. Cao B. H. Zhang X. T. He Y. Q. Gu
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classification physics.plasm-ph
keywords magneticfieldlaserproducedprotoncapacity-coilradiographytarget
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Ultra-intense ultra-short laser is firstly used to irradiate the capacity-coil target to generate magnetic field. The spatial structure and temporal evolution of huge magnetic fields were studied with time-gated proton radiography method. A magnetic flux density of 40T was measured by comparing the proton deflection and particle track simulations. Although the laser pulse duration is only 30fs, the generated magnetic field can last for over 100 picoseconds. The energy conversion efficiency from laser to magnetic field can reach as high as ~20%. The results indicate that tens of tesla (T) magnetic field could be produced in many ultra intense laser facilities around the world, and higher magnetic field could be produced by picosecond lasers.

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