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Characterization of an Intense Laser-Produced Preformed Plasma for Proton Generation
A Sagisaka,A. Noda,A. Fukumi,A. Yogo,A. S. Pirozhkov,H. Daido,K. Nemoto,K. Ogura,M. Nishiuchi,M. Mori,M. Kado,S. Orimo,S. Nakamura,T. Nayuki,T. Shirai,T. Fujii,Y. Oishi,Y. Hayashi,Y. Iwashita,Z. Li 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
High-energy protons are generated with a 3-μm-thick tantalum target irradiated with a highintensity laser under the preformed plasma condition. We observe the electron density distributions of preformed plasmas with two-color probe beams as interferometers. The preformed plasma at the front side of the target is generated by pre-pulses of a high-intensity Ti:sapphire laser. In this preformed plasma condition, the maximum proton enegy is 900 keV. The half angle of the generated proton beam (>500 keV) is about 10.
Development of Laser-driven Proton Source Toward Its Applications
Akito Sagisaka,Hiroyuki Daido,Alexander S. Pirozhkov,Akifumi Yogo,Koichi Ogura,Satoshi Orimo,Jinglong Ma,Michiaki Mori,Mamiko Nishiuchi,Sergei V. Bulanov,Timur Zh. Esirkepov,Yuji Oishi,Takuya Nayuki,T 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We observe the proton signals produced by laser interaction with thin-foil targets of polyimide and of copper. We change the thickness of the polyimide target to 7.5 μm, 12.5 μm, and 50 μm. High-energy protons with the maximum energy of ~2.3 MeV from 7.5 μm thick polyimide are observed. This proton beam with the maximum energy of multi-MeV has various applications such as a proton shadowgraphy.
Ahn, Young Hee,Sagisaka, Shonosuke 中央大學校 遺傳工學硏究所 1993 遺傳工學硏究論集 Vol.6 No.1
溫帶性인 落葉樹木인 poplar의 xylem細胞內에 存在하는 peroxidase 및 IAA(indoleacetic acid)를 究明하기 위하여 실시하였다. poplar의 1년생 shoot에서 조제된 視料는 sucrose density gradient centrifugation에 의해 6개의 band와 침전물이 나타났다. 이들 細胞成分의 band는 marker enzyme에 의해 조사되었다. peroxidase와 IAA活性은 共히 band 6에서 가장 높은 활성을 나타내었다. peroxidase의 季節別 변화는 poplar가 休眠期에 들어가는 9月부터 증가하여 10月중에 가장 높은 활성을 나타내고, 2月 이후부터 점차로 減少하여 6月, 7月, 8月의 生長期에 낮은 활성을 나타내었다. ELISA法에 의해 조사한 IAA의 계절별 변화는 생장기인 6月에 가장 높은 활성을 나타내었으나 7月부터 감소하여 겨울철 휴면기에 낮게 나타났다. peroxidase와 IAA 活性이 가장 높게 나타난 band 6을 따로 분리하여, peroxidase 활성을 갖는 microbody에서의 IAA活性 存在를 연구하기 위하여, alkaline phosphatase 및 fluorescein isothiocyanate로 標識한 anti-peroxidase antibody와 anti-IAA antibody를 이용하였다. band 6과 antibody의 抗原-抗體反應의 결과, peroxidase 활성을 가지는 microbody와 IAA 호르몬 활성을 나타내는 未知의 세포요소와는 전혀 別個의 것으로 思料되었다. Among six visible bands formed in the sucrose density gradient centrifugation, the peroxidase activity of wintering xylem extract of poplar(Populus euramericana cv. gelrica) occurred in the sixth band. The location of peroxidase activity in a particulate fraction(band 6) from sucrose gradient centrifugation have been tested with anti-peroxidase antibodies labeled with the alkaline phosphatase or fluorescein isothiocyanate. Peroxidase activity in the particulate(band 6) was lost by reaction with antibody, while the alkaline phosphatase activity and fluorescence remained in immune complex. Anti-IAA antibody was reacted with the band 6, and peroxidase activity remained in the immune complex. From these results, it was suggested that the particulates containing peroxidase differ from IAA containing ones. In a study using anti-catalase antibody, the peroxidase activity in the particle, remained uneffected. These results suggested that the major peroxidative activity in wintering poplar xylem resulted from the peroxidase activity. The seasonal changes in peroxidase activity and IAA concentration in the particulate and soluble fractions of popular xylem tissues were measured throughout a year. Reciprocal changes in between peroxidase activity and IAA concentration occured in the life cycle of the plants.
Tae Moon Jeong,Akifumi Yogo,Akito Sagisaka,고도경,Hiroyuki Daido,김형택,최일우,Jae Hee Sung,Jongmin Lee,Jung Hoon Kim,Kyung-Han Hong,유태준,Young-Chul Noh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I
The characteristics of the preplasma, such as the electron density and its profile, were investigated from a measurement of the phase shift due to the preplasma in an experiment on high energy proton beam generation. The electron density and its profile were calculated from the measured phase shifts, and their dependences on the prepulse intensity and the time delay were investigated. Although the size of the electron density depended on the prepulse intensity, the maximum electron density ranged from 1.5 × 1019 to 2.1 × 1019 cm.3, irrespective of the prepulse intensity and the time delay in the picosecond range. The analysis showed that a preplasma having an electron density of 1019 cm.3 existed on a target before the main laser pulse arrived at the target for the generation of high energy proton beams.
New Method to Measure the Rise Time of a Fast Pulse Slicer for Laser Ion Acceleration Research
Mori, Michiaki,Yogo, Akifumi,Kiriyama, Hiromitsu,Nishiuchi, Mamiko,Ogura, Koichi,Orimo, Satoshi,Ma, Jinglong,Sagisaka, Akito,Kanazawa, Shuhei,Kondo, Shuji,Nakai, Yoshiki,Akutsu, Atsushi,Yamamoto, Yoic IEEE 2008 IEEE transactions on plasma science Vol.36 No.4
<P> A dependence of cutoff proton kinetic energy on laser prepulse duration has been observed. Amplified spontaneous emission pedestal duration is controlled by a fast electrooptic pulse slicer where the rise time is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this rise time using a stretched frequency-chirped pulse. </P>