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eMP control and characterization on high-power laser systems

High Power Laser Science and engineering 2018年第2期6卷 55-62页

作者： P.Bradford N.C.Woolsey G.G.Scott G.Liao H.Liu Y.Zhang B.Zhu C.Armstrong S.Astbury C.Brenner P.Brummitt F.Consoli I.east R.Gray D.Haddock e Huggard e J.R.Jones e.Montgomery I.Musgrave e Oliveira D.R.Rusby C.Spindloe B.Summers e.zemaityte Z.Zhang Y.Li P.McKenna D.Neely Department of Physics York Plasma InstituteUniversity of YorkHeslingtonYork YO10 5DDUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcot OX110QXUK Key Laboratory for Laser Plasmas(Ministry of education)and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics SUPA University of StrathclydeGlasgow G40NGUK eNeA-C.R.Frascati-Dipartimento FSN Via E.Fermi 4500044 FrascatiItaly Space Science Department STFC Rutherford Appleton LaboratoryDidcot OX110QXUK

Giant electromagnetic pulses(eMP) generated during the interaction of high-power lasers with solid targets can seriously degrade electrical measurements and equipment. eMP emission is caused by the acceleration of hot electrons inside the target, which produce radiation across a wide band from DC to terahertz frequencies. Improved understanding and control of eMP is vital as we enter a new era of high repetition rate, high intensity lasers(e.g. the extreme Light Infrastructure).We present recent data from the VULCAN laser facility that demonstrates how eMP can be readily and effectively reduced. Characterization of the eMP was achieved using B-dot and D-dot probes that took measurements for a range of different target and laser parameters. We demonstrate that target stalk geometry, material composition, geodesic path length and foil surface area can all play a significant role in the reduction of eMP. A combination of electromagnetic wave and 3 D particle-in-cell simulations is used to inform our conclusions about the effects of stalk geometry on eMP,providing an opportunity for comparison with existing charge separation models.

关键词： high energy density physics high-power laser related laser components laser plasmas interaction target design and fabrication

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Study of backward terahertz radiation from intense picosecond laser–solid interactions using a multichannel calorimeter system

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High Power Laser Science and engineering 2019年第1期7卷 47-53页

作者： H. Liu G.-Q. Liao Y.-H. Zhang B.-J. Zhu Z. Zhang Y.-T. Li G. G. Scott D. Rusby C. Armstrong e. zemaityte P. Bradford N. Woolsey P. Huggard P. McKenna D. Neely Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Key Laboratory for Laser Plasmas (Moe) and School of Physics and Astronomy Shanghai Jiao Tong University Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Central Laser Facility Rutherford Appleton Laboratory Department of Physics SUPA University of Strathclyde Department of Physics York Plasma Institute University of York Space Science Department STFC Rutherford Appleton Laboratory

A multichannel calorimeter system is designed and constructed which is capable of delivering single-shot and broadband spectral measurement of terahertz(THz) radiation generated in intense laser–plasma interactions. The generation mechanism of backward THz radiation(BTR) is studied by using the multichannel calorimeter system in an intense picosecond laser–solid interaction experiment. The dependence of the BTR energy and spectrum on laser energy, target thickness and pre-plasma scale length is obtained. These results indicate that coherent transition radiation is responsible for the low-frequency component(erved that a large-scale pre-plasma primarily enhances the high-frequency component(>3 THz) of BTR.

关键词： multichannel calorimeter backward terahertz radiation generation mechanisms

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