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Tsai, P.-E.; Iwamoto, Yosuke; Hagiwara, Masayuki*; Satoh, Daiki; Abe, Shinichiro; Sato, Tatsuhiko; Ito, Masatoshi*; Watabe, Hiroshi*
KEK Proceedings 2019-4, p.18 - 23, 2019/12
With the aim of providing critical nuclear data of primary knock-on atoms (PKAs) created from proton-induced spallation reactions, a new detection system was developed and dedicated to the PKA measurement that requires lower measurement threshold energies and superior mass resolution than the conventional experimental setups. Such requirements can be fulfilled with the TOF-E and dE-E methods and by this new PKA detection system, which consists of two fast timing detectors and one dE-E gas ionization detector. In this workshop, we will be present the design of the dE-E gas ionization chamber and the preliminary results of the PKA charge distribution obtained from 70-MeV protons bombarding a thin C target at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University.
Novello, L.*; Cara, P.*; Coletti, A.*; Gaio, E.*; Maistrello, A.*; Matsukawa, Makoto; Philipps, G.*; Tomarchio, V.*; Yamauchi, Kunihito
IEEE Transactions on Applied Superconductivity, 26(2), p.4700507_1 - 4700507_7, 2016/03
Times Cited Count：9 Percentile：42.03(Engineering, Electrical & Electronic)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
Times Cited Count：15 Percentile：71.43(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
and this remained unchanged until a maximum target thickness of 98 g/cm. 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
, C
, and C
incident ions merged into quasi-equilibrium values at a target thickness of 5.7 g/cm in the pre-equilibrium region and evolved simultaneously to the "real equilibrium" values for all of the initial charge states, including C
and C
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.
Mironov, M. I.*; Khudoleev, A. V.*; Kusama, Yoshinori
Plasma Physics Reports, 30(2), p.164 - 168, 2004/02
Times Cited Count：0 Percentile：0.00(Physics, Fluids & Plasmas)High-energy charge-exchange diagnostics can determine the distribution function of fast atoms produced via the neutralization of hydrogen ions by hydrogen-like impurity ions. Deriving the distribution function requires to know the composition and spatial distribution of the target ions in a plasma. A charge-exchange target forms as a result of the interaction between impurity nuclei and beam atoms. Depending on the arrangement of heating beams with respect to the diagnostics, it is necessary to calculate their trajectories. A model which takes into account elementary processes resulting in the ionization equilibrium of the ions of impurities in a specific tokamak configuration is proposed. The model is applied to the JT-60U plasma. Mechanisms for the formation of charge-exchange atomic flows are considered. The relative contributions of different heating injectors to the charge-exchange flow are estimated. Based on the calculated results, a method is proposed for local measurements of the ion distribution function with a stationary analyzer.
Bi at intermediate energiesHaba, Hiromitsu; Kasaoka, Makoto*; Igarashi, Manabu*; Washiyama, Koshin*; Matsumura, Hiroshi*; Oura, Yasuji*; Shibata, Seiichi*; Sakamoto, Ko*; Furukawa, Michiaki*; Fujiwara, Ichiro*
Radiochimica Acta, 90(7), p.371 - 382, 2002/08
Times Cited Count：2 Percentile：15.85(Chemistry, Inorganic & Nuclear)The reaction yields of 63 radionuclides with the mass number A = 56-135 produced in the photofission of Bi by bremsstrahlung of end-point energies (E
) from 450 to 1100 MeV have been measured using a catcher foil technique. The charge distribution was well reproduced by a Gaussian function with the most probable charge (Z
) expressed by Z = RA + S, and with the A-independent FWHME
. The charge distribution parameters R, S and FWHM were independent of E above 600 MeV. The weighted mean values at E 
600 MeV were R = 0.421 
0.001, S = 0.6 0.1 and FWHM = 2.1 0.1 charge unit (c.u.). Based on the charge distribution parameters, the symmetric mass yield distributions with the most probable mass A of 96 1 mass unit (m.u.) and the width FWHM
of 33 1 m.u. were also obtained. The characteristics of the charge and mass yield distributions are discussed by referring to those for 
Au based on the results of calculations using PICA3/GEM.
Miura, Yukitoshi
Nuclear Fusion, 37(2), p.175 - 187, 1997/00
Times Cited Count：17 Percentile：50.78(Physics, Fluids & Plasmas)no abstracts in English
