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Fabrication of large-area uniform carbon nanotube foams as near-critical-density targets for laser–plasma experiments

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High Power laser Science and Engineering 2021年第2期9卷 209-214页

作者： Pengjie Wang Guijun Qi Zhuo Pan Defeng Kong Yinren Shou Jianbo Liu Zhengxuan Cao Zhusong Mei Shirui Xu Zhipeng Liu Shiyou Chen Ying Gao Jiarui Zhao Wenjun Ma State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologySchool of PhysicsPeking UniversityBeijing 100871China Beijing laser acceleration Innovation Center Beijing 101400China Institute of Guangdong laser Plasma Technology Guangzhou 510540China

Carbon nanotube foams(CNFs)have been successfully used as near-critical-density targets in the laser-driven acceleration of high-energy ions and *** we report the recent advances in the fabrication technique of such *** the further developed floating catalyst chemical vapor deposition(FCCVD)method,large-area(>25 cm^(2))and highly uniform CNFs are successfully deposited on nanometer-thin metal or plastic foils as double-layer *** density and thickness of the CNF can be controlled in the range of 1−13 mg/cm^(3)and 10−200µm,respectively,by varying the synthesis *** dependence of the target properties on the synthesis parameters and the details of the target characterization methods are presented for the first time.

关键词： carbon nanotube foams laser-driven acceleration near-critical density targets ultraintense laser

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laser radiation pressure proton acceleration in gaseous target

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Matter and Radiation at Extremes 2017年第5期2卷 256-262页

作者： V.K.Tripathi Tung-Chang Liu Xi Shao Physics Department Indian Institute of Technology DelhiNew Delhi 110016India Department of Physics University of MarylandCollege ParkMD 20742USA

An analytical model for hole boring proton acceleration by a circularly-polarized CO_(2) laser pulse in a gas jet is *** plasma density profile near the density peak is taken to be rectangular,with inner region thickness l around a laser wavelength and density 10%above the critical,while the outside density is 10%below the *** the rear side,plasma density falls off rapidly to a small *** laser suffers strong reflection from the central region and,at normalized amplitude a _(0)≥1,creates a double *** space charge field of the double layer,moving with velocity v_(f)z,reflects up-stream protons to 2v_(f) velocity,incurring momentum loss at a rate comparable to radiation *** occurs for v_(f)≤ω_(p)√z_(f)lm/m_(p),where m and m_(p) are the electron and proton masses,z_(f) is the distance traveled by the compressed electron layer and u p is the plasma *** Gaussian temporal profile of the laser and parabolic density profile of the upstream plasma,the proton energy distribution is narrowly peaked.

关键词： laser-driven acceleration Radiation pressure proton acceleration Relativistic plasmas

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Transient electromagnetic fields generated in experiments at the PHELIX laser facility

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High Power laser Science and Engineering 2021年第4期9卷 212-225页

作者： M.Scisciò F.Consoli M.Salvadori N.E.Andreev N.G.Borisenko S.Zähter O.Rosmej ENEA Fusion and Technologies for Nuclear Safety Department00044 FrascatiItaly Joint Institute for High Temperatures Russian Academy of Sciences125412 MoscowRussia Moscow Institute of Physics and Technology(National Research University) 141701 MoscowRussia P.N.Lebedev Physical Institute Russian Academy of Sciences119991 MoscowRussia GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 DarmstadtGermany Goethe University Frankfurt 60438 Frankfurt am MainGermany

Large-amplitude electromagnetic radiofrequency fields are created by the charge-separation induced in interactions of high-intensity,short-pulse lasers with solid targets and have intensity that decreases with the distance from the ***,it was experimentally proved very recently that charged particles emitted by petawatt laser±target interactions can be deposited on a capacitor-collector structure,far away from the target,and lead to the rapid(nanosecond-scale)generation of large quasi-static electric fields(MV/m),over wide *** demonstrate here the generation of both these fields in experiments at the PHELIX laser facility,with approximately 20 J energy and approximately 10^(19)W/cm^(2)intensity,for picoseconds laser pulses,interacting with pre-ionized polymer foams of near critical ***-static fields,up to tens of k V/m,were here observed at distances larger than 1 m from the target,with results much higher than the radiofrequency *** is of primary importance for inertial-confinement fusion and laser±plasma acceleration and also for promising applications in different scenarios.

关键词： electromagnetic pulse mitigation electromagnetic pulses laser-driven acceleration laser-plasma

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Control of amorphous solid water target morphology induced by deposition on a charged surface

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High Power laser Science and Engineering 2021年第3期9卷 21-26页

作者： and Arie Zigler Alexander Bespaly Indranuj Dey Jenya Papeer Assaf Shaham Pavel Komm Ibrahim Hadad Gilad Marcus Arie Zigler Department of Applied Physics The Hebrew University of JerusalemJerusalemIsrael Department of Research and Development HIL Applied MedicalLtd.JerusalemIsrael Racah Institute of Physics The Hebrew University of JerusalemJerusalemIsrael

Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion *** we demonstrate an approach that enables us to control the morphology of amorphous solid water(ASW)microstructured targets,by deposition of water vapor on a charged substrate,cooled down to 100 *** morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water *** obtained target is structured as multiple,dense spikes,confined by the charged area on the substrate,with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.

关键词： amorphous solid water morphology laser-driven acceleration laser target

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