Measurements of electron-induced neutrons as a tool for determination of electron temperature of fast electrons in the task of optimization laser-produced plasma ions acceleration

Sakaki, Hironao; Nishiuchi, Mamiko; Maeda, Shota; Sagisaka, Akito; Pirozhkov, A. S.; Pikuz, T.; Faenov, A.*; Ogura, Koichi; Fukami, Tomoyo; Matsukawa, Kenya*; et al.

Review of Scientific Instruments, 85(2), p.02A705_1 - 02A705_4, 2014/02

https://doi.org/10.1063/1.4825154

High intensity laser-plasma interaction has attracted considerable interest for a number of years. The laser-plasma interaction is accompanied by generation of various charged particle beams. Results of simultaneous novel measurements of electron-induced photonuclear neutrons (photoneutron), which are a diagnostic of the laser-plasma interaction, are proposed to use for optimization of the laser-plasma ion generation. The proposed method is demonstrated by the laser irradiation with the intensity os 110 W/cm on the metal foil target. The photoneutrons are measured by using NE213 liquid scintillation detectors. Heavy-ion signal is registered with the CR39 track detector simultaneously. The measured signals of the electron-induced photoneutrons are well reproduced by using the Particle and Heavy Ion Transport code System (PHITS). The results obtained provide useful approach for analyzing the various laser based ion beams.

Development of laser-driven quasi-monoenergetic proton beam line for radiobiology

Yogo, Akifumi; Maeda, Takuya; Hori, Toshihiko; Sakaki, Hironao; Ogura, Koichi; Nishiuchi, Mamiko; Sagisaka, Akito; Bolton, P.; Murakami, Masao*; Kawanishi, Shunichi; et al.

Nuclear Instruments and Methods in Physics Research A, 653(1), p.189 - 192, 2011/10

https://doi.org/10.1016/j.nima.2010.12.016

Measurement of relative biological effectiveness of protons in human cancer cells using a laser-driven quasimonoenergetic proton beamline

Yogo, Akifumi; Maeda, Takuya; Hori, Toshihiko; Sakaki, Hironao; Ogura, Koichi; Nishiuchi, Mamiko; Sagisaka, Akito; Kiriyama, Hiromitsu; Okada, Hajime; Kanazawa, Shuhei; et al.

Applied Physics Letters, 98(5), p.053701_1 - 053701_3, 2011/02

https://doi.org/10.1063/1.3551623

Measured and simulated transport of 1.9 MeV laser-accelerated proton bunches through an integrated test beam line at 1 Hz

Nishiuchi, Mamiko; Sakaki, Hironao; Hori, Toshihiko; Bolton, P.; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Mori, Michiaki; Orimo, Satoshi; Pirozhkov, A. S.; et al.

Physical Review Special Topics; Accelerators and Beams, 13(7), p.071304_1 - 071304_7, 2010/07

https://doi.org/10.1103/PhysRevSTAB.13.071304

A laser-driven repetition-rated 1.9 MeV proton beam line composed of permanent quadrupole magnets (PMQs), a radio frequency (rf) phase rotation cavity, and a tunable monochromator is developed to evaluate and to test the simulation of laser-accelerated proton beam transport through an integrated system for the first time. In addition, the proton spectral modulation and focusing behavior of the rf phase rotationcavity device is monitored with input from a PMQ triplet. In the 1.9 MeV region we observe very weakproton defocusing by the phase rotation cavity. The final transmitted bunch duration and transverse profile are well predicted by the PARMILA particle transport code. The transmitted proton beam duration of 6 ns corresponds to an energy spread near 5% for which the transport efficiency is simulated to be 10%. The predictive capability of PARMILA suggests that it can be useful in the design of future higher energy transport beam lines as part of an integrated laser-driven ion accelerator system.

Hydrogen and hydration in proteins

Niimura, Nobuo; Chatake, Toshiyuki; Kurihara, Kazuo; Maeda, Mitsuru

Cell Biochemistry and Biophysics, 40(3), p.351 - 369, 2004/06

https://doi.org/10.1385/CBB:40:3:351

Neutron diffraction provides an experimental method of directly locating hydrogen atoms in proteins. High resolution neutron diffractometers dedicated to biological macromolecules (BIX-type diffractometer) have been constructed at the Japan Atomic Energy Research Institute (JAERI) and they have been used in the 1.5 AA -resolution crystal structure analyses of several proteins.

Evaluation of particle and thermal diffusivities in the scrape-off layer plasma in JFT-2M tokamak

Uehara, Kazuya; Maeda, Mitsuru; Tsushima, Akira*; Amemiya, Hiroshi*

Contributions to Plasma Physics (CD-ROM), 42(2-4), p.384 - 388, 2002/04

https://doi.org/10.1002/1521-3986(200204)42:2/4<384::AID-CTPP384>3.0.CO;2-H

no abstracts in English

Measuring method for Mach number in tokamak edge plasma using probes

*; Uehara, Kazuya; *

Japanese Journal of Applied Physics, Part 1, 38(5A), p.2971 - 2972, 1999/05

https://doi.org/10.1143/JJAP.38.2971

no abstracts in English

Measurement of the plasma flow using the asymmetric double probe in the JFT-2M tokamak

*; Uehara, Kazuya; *

Proc. of 24th European Physical Society Conf. on Controlled Fusion and Plasma Physics, 21A, p.709 - 712, 1997/00

no abstracts in English

Radiobiological effects by the irradiation of laser-accelerated proton beams

Yogo, Akifumi; Nishiuchi, Mamiko; Sakaki, Hironao; Hori, Toshihiko; Sato, Katsutoshi; Nishikino, Masaharu; Maeda, Takuya; Mori, Michiaki; Ogura, Koichi; Orimo, Satoshi; et al.

no journal, , 

no abstracts in English

Prototype of beam transport line for laser-driven proton therapy

Sakaki, Hironao; Nishiuchi, Mamiko; Hori, Toshihiko; Kondo, Kiminori; Ogura, Koichi; Yogo, Akifumi; Sagisaka, Akito; Orimo, Satoshi; Mori, Michiaki; Tampo, Motonobu; et al.

no journal, , 

We constructed prototype transportation system of the laser driven 2.0MeV by using nuclear power mechanism J-KAREN laser, and we measured and analyzed this beam line.