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Development of an ultrathin liquid sheet target for laser ion acceleration at high repetition rates in the kilohertz range

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High Power laser Science and Engineering 2024年第3期12卷 134-145页

作者： M.Füle A.P.Kovács T.Gilinger M.Karnok P.Gaál S.Figul G.Marowsky K.Osvay National laser-Initiated Transmutation Laboratory University of SzegedSzegedHungary Department of Experimental Physics University of SzegedSzegedHungary ELI ALPS ELI-HU Non-Profit Ltd.SzegedHungary Department of Optics and Quantum Electronics University of SzegedSzegedHungary Advanced Microfluidic Systems GmbH GöttingenGermany

A colliding microjet liquid sheet target system was developed and tested for pairs of round nozzles of 10,11 and 18μm in *** sheet's position stability was found to be better than a few *** interaction with 50 mJ laser pulses,the 18μm jet has a resonance amplitude of 16μm at a repetition rate of 33 Hz,while towards 100 Hz it converges to 10μm for all nozzles.A white-light interferometric system was developed to measure the liquid sheet thickness in the target chamber both in air and in vacuum,with a measurement range of 182 nm±1μm and an accuracy of±3%.The overall shape and 3D shape of the sheet follow the Hasson±Peck model in *** vacuum versus air,the sheet gradually loses 10%of its thickness,so the thinnest sheet achieved was below 200 nm at a vacuum level of 10±4mbar,and remained stable for several hours of operation.

关键词： diagnostics laser ion acceleration nanometric liquid sheet targets vacuum test

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Preparation of graphene on SiC by laser-accelerated pulsed ion beams

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Chinese Physics B 2021年第11期30卷 455-460页

作者： Danqing Zhou Dongyu Li Yuhan Chen Minjian Wu Tong Yang Hao Cheng Yuze Li Yi Chen Yue Li Yixing Geng Yanying Zhao Chen Lin Xueqing Yan Ziqiang Zhao State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Beijing laser acceleration Innovation Center HuairouBeijing 101400China Institute of Guangdong laser Plasma Technology Guangzhou 510540China

laser-accelerated ion beams(LIBs) have been increasingly applied in the field of material irradiation in recent years due to the unique properties of ultra-short beam duration, extremely high beam current, etc. Here we explore an application of using laser-accelerated ion beams to prepare graphene. The pulsed LIBs produced a great instantaneous beam current and thermal effect on the SiC samples with a shooting frequency of 1 Hz. In the experiment, we controlled the deposition dose by adjusting the number of shootings and the irradiating current by adjusting the distance between the sample and the ion source. During annealing at 1100℃, we found that the 190 shots ion beams allowed more carbon atoms to self-assemble into graphene than the 10 shots case. By comparing with the controlled experiment based on ion beams from a traditional ion accelerator, we found that the laser-accelerated ion beams could cause greater damage in a very short time. Significant thermal effect was induced when the irradiation distance was reduced to less than 1 cm, which could make partial SiC self-annealing to prepare graphene dots directly. The special effects of LIBs indicate their vital role to change the structure of the irradiation sample.

关键词： laser ion acceleration graphene self-annealing

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Feasibility study of laser-driven neutron sources for pharmaceutical applications

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High Power laser Science and Engineering 2023年第2期11卷 37-43页

作者： Takato Mori Akifumi Yogo Yasunobu Arikawa Takehito Hayakawa Seyed R.Mirfayzi Zechen Lan Tianyun Wei Yuki Abe Mitsuo Nakai Kunioki Mima Hiroaki Nishimura Shinsuke Fujioka Ryosuke Kodama Institute of laser Engineering Osaka UniversitySuitaJapan National Institutes for Quantum Science and Technology TokaiJapan Tokamak Energy Ltd. AbingdonUK Graduate School of Engineering Osaka UniversitySuitaJapan Fukui University of Technology FukuiJapan

We predict the production yield of a medical radioisotope^(67)Cu using^(67)Zn(n,p)^(67)Cu and ^(68)Zn(n,pn)^(67)Cu reactions with fast neutrons provided from laser-driven neutron *** neutrons were generated by the p+9Be and d+9Be reactions with high-energy ions accelerated by laser–plasma *** evaluated the yield to be(3.3±0.5)×10^(5) atoms for^(67)Cu,corresponding to a radioactivity of 1.0±0.2 Bq,for a Zn foil sample with a single laser *** a simulation with this result,we estimated^(67)Cu production with a high-frequency *** result suggests that it is possible to generate^(67)Cu with a radioactivity of 270 MBq using a future laser system with a frequency of 10 Hz and 10,000-s radiation in a hospital.

关键词： laser ion acceleration laser-driven neutron source medical radioisotope

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