首页|Spatial and temporal evolution of electro-magnetic pulses from solid target irradi-ated with multi-hundred-terawatt laser pulse inside target chamber
Spatial and temporal evolution of electro-magnetic pulses from solid target irradi-ated with multi-hundred-terawatt laser pulse inside target chamber
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Giant electromagnetic pulses(EMPs)induced by high-power laser irradiating solid targets interfere with various experimental diagnoses and even damage equipment,so unveiling the evolution of EMPs inside the laser chamber is crucial for designing effective EMP shielding.In this work,the transmission characteristics of EMPs as a function of distances from the target chamber center(TCC)are studied using B-dot probes.The mean EMP amplitude generated by picosecond laser-target interaction reaches 561 kV m-1,357 kV m-1,395 kV m-1,and 341 kV m-1 at 0.32 m,0.53 m,0.76 m,and 1 m from TCC,which decreases dramatically from 0.32 m to 0.53 m.However,it shows a fluctuation from 0.53 m to 1 m.The temporal features of EMPs indicate that time-domain EMP signals near the target chamber wall have a wider full width at half maximum compared to that close to TCC,mainly due to the echo oscillation of electromagnetic waves inside the target chamber based on simulation and experimentation.The conclusions of this study will provide a new approach to mitigate strong electromagnetic pulses by decreasing the echo oscillation of electromagnetic waves inside the target chamber during laser coupling with targets.
State Key Laboratory of Nuclear Physics and Technology,and Key Laboratory of HEDP of the Ministry of Education,CAPT,Peking University,Beijing 100871,People's Republic of China
Beijing Laser Acceleration Innovation Center,Beijing 101400,People's Republic of China
Science and Technology on Plasma Physics Laboratory,Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,People's Republic of China
School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,People's Republic of China
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Science and Technology on Plasma Physics Laboratory of the China Academy of Engineering Physics for their kind help with theNational Grand Instrument ProjectNational Key Program for Science and Technology Research and Development国家自然科学基金国家自然科学基金Foundation of Science and Technology on Plasma Physics Laboratory
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