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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>
Satoshi Suzuki,Takemi Matsui,Kentaro Mikajiri,Yusuke Sakaguchi,Kazuhiro Ando,Nobuyuki Nishiuchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In order to predict of accuracy of movement just before the onset of movement using biological signals, the relationships between MRCP measured as a physiological index and the accuracy of task performance were investigated. As experiments, subjects touched the target appearing 300 pixels away from a start point in a verticaldirection on a touch-sensitive screen with the forefinger. During experiments, EEG, EMG as trigger, high-speed camera images, and task efficiency were acquired. As a result, significant differences between the high- and low-performance groups were clearly confirmed on the slope of NS in MRCPs. Furthermore, a difference between these groups wasconfirmed in duration of ballistic movement.
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.
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.