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Induction heating for desorption of surface contamination for high-repetition laser-driven carbon-ion acceleration

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Matter and Radiation at Extremes 2023年第5期8卷 19-25页

作者： Sadaoki Kojima Tatsuhiko Miyatake Hironao Sakaki Hiroyoshi Kuroki Yusuke Shimizu Hisanori Harada Norihiro Inoue Thanh Hung Dinh Masayasu Hata Noboru Hasegawa Michiaki Mori Masahiko Ishino Mamiko Nishiuchi kotaro kondo Masaharu Nishikino Masaki Kando Toshiyuki Shirai Kiminori kondo Kansai Institute for Photon Science National Institutes for Quantum Science and Technology(QST)8-1-7 UmemidaiKizugawaKyoto 619-0215Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga-KoenKasugaFukuoka 816-8580Japan Hitachi Zosen Corporation 7-89 Nanko-Kita 1-chomeSuminoe-kuOsaka 559-8559Japan Department of Accelerator and Medical Physics Institute for Radiological ScienceNational Institutes for Quantum Science and Technology(QST)4-9-1 AnagawaInage-kuChiba 263-8555Japan

This study reports the first experimental demonstration of surface contamination cleaning from a high-repetition supply of thin-tape targets for laser-driven carbon-ion *** adsorption of contaminants containing protons,mainly water vapor and hydrocarbons,on the surface of materials exposed to low vacuum(>10^(−3)Pa)suppresses carbon-ion *** newly developed contamination cleaner heats a 5-μm-thick nickel tape to over 400℃in 100 ms by induction *** the future,this heating method could be scaled to laserdriven carbon-ion acceleration at rates beyond 10 *** contaminant hydrogen is eliminated from the heated nickel surface,and a carbon source layer—derived from the contaminant carbon—is spontaneously formed by the catalytic effect of *** species of ions accelerated from the nickel film heated to various temperatures have been observed *** the nickel film is heated beyond∼150℃,the proton signal considerably decreases,with a remarkable increase in the number and energy of carbon *** Langmuir adsorption model adequately explains the temperature dependence of desorption and re-adsorption of the adsorbed molecules on a heated target surface,and the temperature required for proton-free carbon-ion acceleration can be estimated.

关键词： acceleration heated nickel

Enhancement of pre-pulse and picosecond pedestal contrast of the petawatt J-KAREN-P laser

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High Power Laser Science and Engineering 2021年第4期9卷 192-199页

作者： Hiromitsu Kiriyama Yasuhiro Miyasaka Akira Kon Mamiko Nishiuchi Akito Sagisaka Hajime Sasao Alexander S.Pirozhkov Yuji Fukuda Koichi Ogura kotaro kondo Nicholas P.Dover Masaki Kando Kansai Photon Science Institute National Institutes for Quantum Science and Technology(QST)Kizugawa 619-0215Japan Naka Fusion Institute National Institutes for Quantum Science and Technology(QST)Naka 311-0193Japan

We have experimentally improved the temporal contrast of the petawatt J-KAREN-P laser *** have investigated how the generation of pre-pulses by post-pulses changes due to the temporal overlap between the stretched pulse and the post-pulse in a chirped-pulse amplification *** have shown that the time at which the pre-pulse is generated by the post-pulse and its shape are related to the time difference between the stretched main pulse and the *** this investigation,we have found and identified the origins of the pre-pulses and have demonstrated the removal of most pre-pulses by eliminating the post-pulse with wedged *** have also demonstrated the impact of stretcher optics on the picosecond *** have realized orders of magnitude enhancement of the pedestal by improving the optical quality of a key component in the stretcher.

关键词： chirped-pulse amplification temporal contrast ultra-high-intensity lasers

Characterization of the plasma mirror system at the J-KAREN-P facility

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High Power Laser Science and Engineering 2022年第4期10卷 26-35页

作者： Akira Kon Mamiko Nishiuchi Yuji Fukuda kotaro kondo Koichi Ogura Akito Sagisaka Yasuhiro Miyasaka Nicholas P.Dover Masaki Kando Alexander S.Pirozhkov Izuru Daito Liu Chang Il Woo Choi Chang Hee Nam Tim Ziegler Hans-Peter Schlenvoigt Karl Zeil Ulrich Schramm Hiromitsu Kiriyama Kansai Photon Science Institute National Institutes for Quantum Science and TechnologyKyoto 619-0215Japan Center for Relativistic Laser Science Institute for Basic ScienceGwangju 61005Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Physics and Photon Science Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Helmholtz-ZentrumDresden-Rossendorf 01328 DresdenGermany Technische Universitat Dresden 01062 DresdenGermany

We report on the design and characterization of the plasma mirror system installed on the J-KAREN-P laser at the Kansai Photon Science Institute,National Institutes for Quantum Science and *** reflectivity of the single plasma mirror system exceeded 80%.In addition,the temporal contrast was improved by two orders of magnitude at 1 ps before the main ***,the laser near-field spatial distribution after the plasma mirror was kept constant at plasma mirror fluence of less than 100 kJ/cm^(2).We also present the results of investigating the difference and the fluctuation in energy,pulse width and pointing stability with and without the plasma mirror system.

关键词： high-powerlasers laser plasma plasma mirror

Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities

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Light(Science & Applications) 2023年第4期12卷 593-604页

作者： Nicholas P.Dover Tim Ziegler Stefan Assenbaum Constantin Bernert Stefan Bock Florian-Emanuel Brack Thomas E.Cowan Emma J.Ditter Marco Garten Lennart Gaus Ilja Goethel George S.Hicks Hiromitsu Kiriyama Thomas Kluge James K.Koga Akira Kon kotaro kondo Stephan Kraft Florian Kroll Hazel F.Lowe Josefine Metzkes-Ng Tatsuhiko Miyatake Zulfikar Najmudin Thomas Püschel Martin Rehwald Marvin Reimold Hironao Sakaki Hans-Peter Schlenvoigt Keiichiro Shiokawa Marvin E.P.Umlandt Ulrich Schramm Karl Zeil Mamiko Nishiuchi Kansai Photon Science Institute National Institutes for Quantum Science and Technology8-1-7 UmemidaiKizugawaKyoto 619-0215Japan The John Adams Institute for Accelerator Science Blackett LaboratoryImperial College LondonLondon SW72AZUnited Kingdom Helmholtz-Zentrum Dresden-Rossendorf 01328 DresdenGermany Technische Universitat Dresden 01069 DresdenGermany Interdiscipllinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga-KoenKasugaFukuoka 816-8580Japan

Laser-driven ion sources are a rapidly developing technology producing high energy,high peak current *** suitability for applications,such as compact medical accelerators,motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond *** applications not only require high beam energy,but also place demanding requirements on the source stability and *** can be seriously affected by the laser temporal contrast,precluding the replication of ion acceleration performance on independent laser systems with otherwise similar ***,we present the experimental generation of>60 MeV protons and>30 MeV u-1 carbon ions from sub-micrometre thickness Formvar foils irradiated with laser intensities>1021 *** are accelerated by an extreme localised space charge field≥30TVm-1,over a million times higher than used in conventional *** field is formed by a rapid expulsion of electrons from the target bulk due to relativistically induced transparency,in which relativistic corrections to the refractive index enables laser transmission through normally opaque *** replicate the mechanism on two different laser facilities and show that the optimum target thickness decreases with improved laser contrast due to reduced *** demonstration that energetic ions can be accelerated by this mechanism at different contrast levels relaxes laser requirements and indicates interaction parameters for realising application-specific beam delivery.

关键词： acceleration intense transparency

Harnessing a T1 Phage-Derived Spanin for Developing Phage-Based Antimicrobial Development

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BioDesign Research 2024年第1期6卷 28-38页

作者： Wakana Yamashita Shinjiro Ojima Azumi Tamura Aa Haeruman Azam Kohei kondo Zhang Yuancheng Longzhu Cui Masaki Shintani Masato Suzuki Yoshimasa Takahashi Koichi Watashi Satoshi Tsuneda kotaro Kiga Research Center for Drug and Vaccine Development National Institute of Infectious DiseasesTokyo 162-8640Japan Department of Life Science and Medical Bioscience Waseda University2-2 Wakamatsu-choShinjuku-kuTokyo 162-8480Japan Division of Infectious Diseases Advanced Clinical Research CenterThe Institute of Medical ScienceThe University of TokyoTokyo 108-8639Japan Antimicrobial Resistance Research Center National Institute of Infectious DiseasesTokyoJapan Division of Bacteriology Department of Infection and ImmunitySchool of MedicineJichi Medical UniversityShimotsuke-shiTochigi 329-0498Japan Department of Engineering Graduate School of Integrated Science and TechnologyShizuoka University3-5-1 JohokuNaka-kuHamamatsuShizuoka432-8561Japan Phage Therapy Institute Comprehensive Research OrganizationWaseda University2-2 Wakamatsu-choShinjuku-kuTokyo 162-8480Japan

The global increase in the prevalence of drug-resistant bacteria has necessitated the development of alternative treatments that do not rely on conventional antimicrobial *** bacteriophage-derived lytic enzymes in antibacterial therapy shows promise;however,a thorough comparison and evaluation of their bactericidal efficacy are *** study aimed to compare and investigate the bactericidal activity and spectrum of such lytic enzymes,with the goal of harnessing them for antibacterial ***,we examined the bactericidal activity of spanins,endolysins,and holins derived from 2 Escherichia coli model phages,T1 and *** these,T1-spanin exhibited the highest bactericidal activity against ***,we expressed T1-spanin within bacterial cells and assessed its bactericidal activity.T1-spanin showed potent bactericidal activity against all clinical isolates tested,including bacterial strains of 111 ***,2 Acinetobacter spp.,3 Klebsiella spp.,and 3 Pseudomonas *** contrast,T1 phage-derived endolysin showed bactericidal activity against *** and ***,yet its efficacy against other bacteria was inferior to that of ***,we developed a phage-based technology to introduce the T1-spanin gene into target *** synthesized non-proliferative phage exhibited strong antibacterial activity against the targeted *** potent bactericidal activity exhibited by spanins,combined with the novel phage synthetic technology,holds promise for the development of innovative antimicrobial agents.

关键词： development antimicrobial developing harnessing phage-based phage-derived spanin