JOPSS - Search Results

Journal Articles

Equilibrium and non-equilibrium charge-state distributions of 2.0 MeV/u carbon ions passing through carbon foils

Imai, Makoto*; Sataka, Masao*; Matsuda, Makoto; Okayasu, Satoru; Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Komaki, Kenichiro*; Shibata, Hiromi*; Nishio, Katsuhisa

Nuclear Instruments and Methods in Physics Research B, 354, p.172 - 176, 2015/07

https://doi.org/10.1016/j.nimb.2014.12.045

Times Cited Count：14 Percentile：75.23(Instruments & Instrumentation)

Both equilibrium and non-equilibrium charge-state distributions were studied experimentally for 2.0 MeV/u carbon ions after passing through carbon foils. Measured charge-state distribution established the equilibrium at a target thickness of 10 g/cm $^{2}$ and this remained unchanged until a maximum target thickness of 98 g/cm $^{2}$ . The equilibrium charge-state distribution, the equilibrium mean charge-state, and the width and skewness of the equilibrium distribution were compared with predictions using existing semi-empirical formulae as well as simulation results, including the ETACHA code. It was found that charge-state distributions, mean charge states, and distribution widths for C $^{2+}$ , C $^{3+}$ , and C $^{4+}$ incident ions merged into quasi-equilibrium values at a target thickness of 5.7 g/cm $^{2}$ in the pre-equilibrium region and evolved simultaneously to the "real equilibrium" values for all of the initial charge states, including C $^{5+}$ and C $^{6+}$ ions. Two kinds of simulation, ETACHA and solution of rate equations taking only single electron transfers into account, were used, and both of them reproduced the measured charge evolution qualitatively. The quasi-equilibrium behavior could be reproduced with the ETACHA code, but not with solution of elementary rate equations.

Journal Articles

New approach to measure double-differential charged-particle emission cross sections of several materials for a fusion reactor

Kondo, Keitaro; Takagi, Satoshi*; Murata, Isao*; Miyamaru, Hiroyuki*; Takahashi, Akito*; Kubota, Naoyoshi; Ochiai, Kentaro; Nishitani, Takeo

Fusion Engineering and Design, 81(8-14), p.1527 - 1533, 2006/02

https://doi.org/10.1016/j.fusengdes.2005.08.070

Times Cited Count：14 Percentile：68.04(Nuclear Science & Technology)

In a fusion reactor development, double-differential charged-particle emission cross sections(DDXc) are necessary to estimate nuclear heating and material damages of candidate materials irradiated with neutrons. Especially in light nuclei such as Be, Li, and C, nuclear reactions are complicated and difficult to estimate energy spectra of emitted particles based only on theoretical calculations Therefore development of a new technique for precise measurements of DDXc is quite important. Recently we successfully developed a new spectrometer for measurement of DDXc using a pencil-beam DT neutron source of FNS in JAERI. In the present study we carried out measurements of DDXc of $^{9}$ Be, $^{12}$ C, $^{19}$ F, and $^{27}$ Al using the spectrometer. The present technique was valid from the result of measurement for the $^{27}$ Al(n,x) reactions. Slight differences appeared between measured data and evaluation or previous experimental values for $^{9}$ Be(n,x) reactions at backward scattering angle and in lower energy region.

Journal Articles

Structure analysis of carbon cluster ion using coulomb explosion

Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa

JAEA-Review 2005-001, TIARA Annual Report 2004, p.343 - 345, 2006/01

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2005-001-p0001-p0126.pdf

Recently, we have gained interesting results on the interaction between a swift cluster ion and a solid in TIARA. For the elucidation of these interactions and the physical effects, it is very important to grasp the structure of the cluster. For this purpose, a measurement system based on Coulomb explosion imaging (ECI) for analyzing the structure of small carbon clusters has been developed. The ECI technique involves the foil-induced dissociation of a swift cluster by electron stripping. As our first step of the investigation on the carbon cluster structure, the preliminary experiment was carried out on the structure dependence on the average charge state of atoms that composed a cluster passing through a thin foil.The result shows the same tendency as a calculated theoretical value.

Journal Articles

Measurement of carbon cluster charge state passing through thin foils using a luminance plate

Chiba, Atsuya; Saito, Yuichi; Tajima, Satoshi

Nuclear Instruments and Methods in Physics Research B, 232(1-4), p.32 - 36, 2005/05

https://doi.org/10.1016/j.nimb.2005.03.021

Times Cited Count：10 Percentile：58.83(Instruments & Instrumentation)

The structure of cluster ion may be important parameter for resolution of physical effect and interaction with cluster ion and solid. In this paper, we report a Coulomb explosion imaging of the constituent atoms of a swift carbon cluster (Cn, n=2, 3 and 6) passing through a thin foil and their average charge state that related with the structure of the cluster. The experimental setup is based on the 3MV TANDEM accelerator at the JAERI Takasaki. The cluster ion beam is pulsed by electrical deflection plates and an aperture. A few clusters pass trough the thin foil during 1 second, and the resulting are collected by the luminance plate detector. The average charge state was shown an almost same tendency as calculate theoretical value.

Journal Articles

Charge state distribution and its equilibration of 2 MeV/u sulfur ions passing through carbon foils

Imai, Makoto*; Sataka, Masao; Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Komaki, Kenichiro*; Shibata, Hiromi*; Sugai, Hiroyuki; Nishio, Katsuhisa

Nuclear Instruments and Methods in Physics Research B, 230(1-4), p.63 - 67, 2005/04

https://doi.org/10.1016/j.nimb.2004.12.018

Times Cited Count：8 Percentile：52.8(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Optimized energetic particle emissions from Xe clusters in intense laser fields

Fukuda, Yuji; Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Kishimoto, Yasuaki

Physical Review A, 67(6), p.061201_1 - 061201_4, 2003/06

https://doi.org/10.1103/PhysRevA.67.061201

Times Cited Count：57 Percentile：88.31(Optics)

We have probed the interaction of intense laser fields with Xe clusters by measuring the energy and charge state distributions of emitted ions and electrons using ultrafast 20 fs pulses. This work demonstrates that the energetic particle emissions from laser-cluster interactions can be optimized by manipulating the character of ultrafast laser pulses, i.e. pulse duration and sign of chirp.

Journal Articles