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Mori, Michiaki; Kondo, Kiminori; Mizuta, Yoshio*; Kando, Masaki; Kotaki, Hideyuki; Nishiuchi, Mamiko; Kado, Masataka; Pirozhkov, A. S.; Ogura, Koichi; Sugiyama, Hironori*; et al.
Physical Review Special Topics; Accelerators and Beams, 12(8), p.082801_1 - 082801_5, 2009/08
Times Cited Count:22 Percentile:78(Physics, Nuclear)The pointing stability and divergence of a quasimonoenergetic electron bunch generated in a self-injected laser-plasma acceleration regime using 4 TW laser is studied. A pointing stability of 2.4 mrad root-mean-square (RMS) and a beam divergence of 10.6 mrad (RMS) were obtained using an argon gas-jet target for 50 sequential shots, while these values were degraded by a factor of three at the optimum condition using helium. The peak electron energies were 8.50.7 MeV and 24.83.6 MeV using argon and helium, respectively. The experimental results indicate that the different propagation condition could be generated with the different material, although it is performed with the same irradiation condition.
Yogo, Akifumi; Sato, Katsutoshi; Nishikino, Masaharu; Mori, Michiaki; Teshima, Teruki*; Numasaki, Hodaka*; Murakami, Masao*; Demizu, Yusuke*; Akagi, Takashi*; Nagayama, Shinichi*; et al.
Applied Physics Letters, 94(18), p.181502_1 - 181502_3, 2009/05
Times Cited Count:109 Percentile:94.78(Physics, Applied)Nishiuchi, Mamiko; Daito, Izuru; Ikegami, Masahiro; Daido, Hiroyuki; Mori, Michiaki; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Pirozhkov, A. S.; et al.
Applied Physics Letters, 94(6), p.061107_1 - 061107_3, 2009/02
Times Cited Count:57 Percentile:87.53(Physics, Applied)A pair of conventional permanent magnet quadrupoles is used to focus a 2.4 MeV laser-driven proton beam at a 1 Hz repetition rate. The magnetic field strengths are 55 T/m and 60 T/m for the first and second quadrupoles respectively. The proton beam is focused to a spot size (full width at half maximum) of 2.78 mm at a distance of 650 mm from the source. This result is in good agreement with a Monte Carlo particle trajectory simulation.
Mori, Michiaki; Mizuta, Yoshio*; Kondo, Kiminori; Nishiuchi, Mamiko; Kado, Masataka; Kando, Masaki; Pirozhkov, A. S.; Kotaki, Hideyuki; Ogura, Koichi; Sugiyama, Hironori*; et al.
no journal, ,
The collimatability of quasi-monoenergetic electron beam production in the self-injected laser-plasma acceleration regime is studied. The collimation of electron beam drived by terawatt femtosecond laser (4.1 TW, 40 fs) is measured at two species of gas material (Helium gasjet and Argon gasjet). We measured 3.2 mrad pointing stability and beam divergence of 11 mrad (r.m.s.) at Argon gasjet for 50 sequencial shots. At such condition, the peak electron energy is 9.11.0 MeV with 80% reproducebility. For Helium, the pointing stability is three times larger than that of Argon. It is considered that the laser channel formation is important role for stable electron beam generation.
Mori, Michiaki; Mizuta, Yoshio*; Kondo, Kiminori; Nishiuchi, Mamiko; Kado, Masataka; Kando, Masaki; Pirozhkov, A. S.; Kotaki, Hideyuki; Ogura, Koichi; Sugiyama, Hironori*; et al.
no journal, ,
The stability and collimatability of quasi-monoenergetic electron beam production in the self-injected laser-plasma acceleration regime are studied. The collimation of electron beam drived by terawatt femtosecond laser (4.5 TW, 40 fs) is measured at two species of gas material (Helium gasjet and Argon gasjet). We measured 3.2 mrad pointing stability and beam divergence of 11 mrad (r.m.s.) at Argon gasjet for 50 continuous shots. At such condition, the peak electron energy is 9.11.6 MeV. For Helium, the pointing stability is three times larger than that of Argon. It is considered that the laser channel formation is important role for stable electron beam generation.
Pirozhkov, A. S.; Mori, Michiaki; Yogo, Akifumi; Kiriyama, Hiromitsu; Ogura, Koichi; Sagisaka, Akito; Ma, J.*; Orimo, Satoshi; Nishiuchi, Mamiko; Sugiyama, Hironori*; et al.
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Nishiuchi, Mamiko; Daito, Izuru; Mori, Michiaki; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Sakaki, Hironao; Hori, Toshihiko; Yogo, Akifumi; Pirozhkov, A. S.; et al.
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From our previous research, we have successfully produce MeV proton beam by 1Hz repetition rate stabely from the interaction between the femto-second TW laser with solid target. Produced proton beam exhibits lower emittance. The number of proton beam is 10. However, it shows large divergence angle of 10 degree. The energy spectrum exhibits 100% energy spread. These are problematic for some specific applications. In this study we transported the laser-driven proton beam with permanent quadrapole magnet for the future application. We successfully obtain focused proton beam as well as the monochromatic proton beam. Those spatial distribution at the focus point as well as the spectral information is well reproduced by the montecalro simulation.
Ogura, Koichi; Shizuma, Toshiyuki; Hayakawa, Takehito; Orimo, Satoshi; Sagisaka, Akito; Nishiuchi, Mamiko; Mori, Michiaki; Yogo, Akifumi; Pirozhkov, A. S.; Sugiyama, Hironori*; et al.
no journal, ,
Protons with energies up to 3 MeV have been generated by the irradiation of a 7.5 m thickness target by a 1 Hz table top laser with intensity of 700mJ. These protons were used to induce the nuclear reaction 7Li(p,n)7Be. Simultaneously, energy of proton was detected by a time of flight method.
Mori, Michiaki; Ogura, Koichi; Yogo, Akifumi; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Pirozhkov, A. S.; Sagisaka, Akito; Orimo, Satoshi; Tampo, Motonobu; Daito, Izuru; et al.
no journal, ,
Experimental studies of laser-driven ion acceleration aimed at ion therapy for cancer treatment are being conducted at the PMRC of JAEA using the J-KAREN Ti:Sapphire laser system at JAEA's APRC. In recent experiments thin foil targets have been irradiated with focused 38 fs laser pulses at the 1.8J laser energy. The energy spectrum of the proton beam is observed to extend to a cut-off value in excess of 7-MeV. Our results expose the prospects and challenges associated with developing a laser-driven ion therapy facility.
Nishiuchi, Mamiko; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Pirozhkov, A. S.; Mori, Michiaki; Kiriyama, Hiromitsu; Orimo, Satoshi; Tampo, Motonobu; Daito, Izuru; et al.
no journal, ,
no abstracts in English
Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Yogo, Akifumi; Ogura, Koichi; Orimo, Satoshi; Nishiuchi, Mamiko; Tampo, Motonobu; Sakaki, Hironao; Hori, Toshihiko; et al.
no journal, ,
no abstracts in English
Nishiuchi, Mamiko; Sakaki, Hironao; Hori, Toshihiko; Bolton, P.; Ogura, Koichi; Yogo, Akifumi; Pirozhkov, A. S.; Sagisaka, Akito; Orimo, Satoshi; Mori, Michiaki; et al.
no journal, ,
no abstracts in English
Mori, Michiaki; Ogura, Koichi; Yogo, Akifumi; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Pirozhkov, A. S.; Sagisaka, Akito; Orimo, Satoshi; Tampo, Motonobu; Daito, Izuru; et al.
no journal, ,
no abstracts in English
Orimo, Satoshi; Abe, Hiroshi; Daido, Hiroyuki; Nishiuchi, Mamiko; Kishimoto, Masahiko*; Aone, Shigeo*; Uchida, Hirohisa*; Ogura, Koichi; Pirozhkov, A. S.; Suguyama, Hironori*; et al.
no journal, ,
The fuel cell was researched in the Kansai Photon Science Institute, JAEA. It has aimed at the surface modification of a metallic material. The laser driven proton beam is a spectrum of 10 kev-MeV that the pulse duration is about ns. The irradiation did -10-100 shot by 1Hz J-KAREN laser system.
Ogura, Koichi; Shizuma, Toshiyuki; Hayakawa, Takehito; Orimo, Satoshi; Sagisaka, Akito; Nishiuchi, Mamiko; Mori, Michiaki; Yogo, Akifumi; Pirozhkov, A. S.; Sugiyama, Hironori*; et al.
no journal, ,
Ultrashort and high intensity laser can induce high energy protons. Proton beams have a wide range of applications such as in the production of radioisotopes and proton therapy. An energy of the proton beam has a wide distribution. The distribution of activity in depth is calculated while laser induced protons are injected into an iron plate.
Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Yogo, Akifumi; Nishiuchi, Mamiko; Ogura, Koichi; Orimo, Satoshi; Tampo, Motonobu; Sakaki, Hironao; Hori, Toshihiko; et al.
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High-intensity laser and mater interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz (THz) radiation. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical applications. We have performed the experiment of proton generation from a thin-foil target for developing the laser-driven ion source. We use a Ti:sapphire laser system (J-KAREN) at JAEA. A laser beam focused by an off-axis parabolic mirror on the thin-foil target. The pulse duration of laser is 40 fs (FWHM). The estimated peak intensity is 510W/cm. We observed the protons at the rear side of the target with a TOF(Time of Flight) proton spectrometer. The maximum energy of proton is 7 MeV with a 2.5 m thick stainless-steel target.