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Journal Articles

Nucleon and $$Delta$$ isobar in a strong magnetic field

Yakhshiev, U.*; Kim, H.-C.; Oka, Makoto

Physical Review D, 99(5), p.054027_1 - 054027_11, 2019/03

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

We investigate Skyrmion solution of the chiral Lagrangian with magnetic field. We find that the Skyrmion is deformed in the magnetic field and its mass increases accordingly. The nucleon and $$Delta$$ isobar states are considered in the Skyrme model.

Journal Articles

High-field phase diagram of the heavy-fermion metal CeIn$$_3$$; Pulsed-field NMR study on single crystals up to 56 T

Tokunaga, Yo; Orlova, A.*; Bruyant, N.*; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, M.*; Higa, Nonoka; et al.

Physical Review B, 99(8), p.085142_1 - 085142_5, 2019/02

 Times Cited Count:1 Percentile:79.37(Materials Science, Multidisciplinary)

The heavy-fermion antiferromagnet CeIn$$_3$$ exhibits a field-induced anomaly associated with Fermi surface reconstruction at $$H^*sim$$ 45 T, well below the antiferromagnetic (AFM) critical field that exceeds 60 T. In order to explore the origin of this anomaly, we have measured $$^{115}$$In NMR spectra in pulsed magnetic fields up to 56 T using high-quality single crystals. To within experimental resolution, we do not detect any change in the NMR spectra that could suggest a modification in either the character of the hyperfine field or the electric field gradient at In sites through $$H^*$$. This strongly suggests that the 45 T anomaly cannot be simply ascribed to a field-induced change in the magnetic structure of the AFM state.

Journal Articles

J-PARC RCS; Effects of nonlinear field components of injection bump magnets on circulating beam

Hotchi, Hideaki; Harada, Hiroyuki

Proceedings of 15th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.371 - 375, 2018/08

no abstracts in English

JAEA Reports

Study on small-sized tailless beam formation using multipole magnetic field (Joint research)

Yokota, Wataru; Yuri, Yosuke; Watanabe, Shinichi*; Oshiro, Yukimitsu*; Kubono, Shigeru*

JAEA-Technology 2016-005, 21 Pages, 2016/03


The Center of Nuclear Science (CNS) of Tokyo University conducts the research on nuclear physics using CNS Radio-Isotope Beam Separator (CRIB) installed at the RIKEN AVF cyclotron. Takasaki Advanced Radiation Research Institute, JAEA has an AVF cyclotron of similar scale and is developing a technology to form a large-area uniform beam by an octupole magnetic field for the research on materials science. They carried out an R&D to increase the cyclotron beam intensity at a target under joint research. The nonlinear beam optics was designed to form a usual cyclotron beam having a large transverse tail into a small-sized tailless distribution so that the beam passes the gas target orifice (6 mm in diameter) of CRIB without a loss. As a result of particle tracking simulations based on the measured beam emittance, it has been found that an octupole magnetic field is effective in tail-folding and a 10-mm-diameter beam can be formed with two octupole magnets added in the present beam line. It has been also found that additional magnets need to be installed and the beam emittance should be reduced for the objective beam size of 6 mm. Moreover, the objective may be attained if the beam path length and configuration of the magnetic lens system are freely chosen.

Journal Articles

X-ray absorption spectroscopy in the heavy Fermion compound $$alpha$$-YbAlB$$_4$$ at high magnetic fields

Terashima, Taku*; Matsuda, Yasuhiro*; Kuga, Kentaro*; Suzuki, Shintaro*; Matsumoto, Yosuke*; Nakatsuji, Satoru*; Kondo, Akihiro*; Kindo, Koichi*; Kawamura, Naomi*; Mizumaki, Masaichiro*; et al.

Journal of the Physical Society of Japan, 84(11), p.114715_1 - 114715_4, 2015/11

 Times Cited Count:1 Percentile:85.56(Physics, Multidisciplinary)

Journal Articles

In-vessel coils for magnetic error field correction in JT-60SA

Matsunaga, Go; Takechi, Manabu; Sakurai, Shinji; Suzuki, Yasuhiro*; Ide, Shunsuke; Urano, Hajime

Fusion Engineering and Design, 98-99, p.1113 - 1117, 2015/10

 Times Cited Count:11 Percentile:25.63(Nuclear Science & Technology)

Journal Articles

Reentrant superconductivity driven by quantum tricritical fluctuations in URhGe; Evidence from $$^{59}$$Co NMR in URh$$_{0.9}$$Co$$_{0.1}$$Ge

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, M.*; Sakai, Hironori; Kambe, Shinsaku; Araki, Shingo*

Physical Review Letters, 114(21), p.216401_1 - 216401_5, 2015/05

 Times Cited Count:36 Percentile:9.86(Physics, Multidisciplinary)

Our measurements of the $$^{59}$$Co NMR spin-spin relaxation in URh$$_{0.9}$$Co$$_{0.1}$$Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at $$H_Rapprox13$$ T, around which reentrant superconductivity (RSC) occurs in the ferromagnetic heavy fermion compound URhGe. We show that critical fluctuations develop in the same limited region near the field $$H_R$$ as that where RSC is observed. This strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC. The fluctuations observed are characteristic of a tricritical point.

Journal Articles

Synchrotron X-ray spectroscopy study on the valence state and magnetization in $$alpha$$-YbAl$$_{1-x}$$Fe$$_x$$B$$_4$$ ($$x=0.115$$) at low temperatures and high magnetic fields

Terashima, Taku*; Matsuda, Yasuhiro*; Kuga, Kentaro*; Suzuki, Shintaro*; Matsumoto, Yosuke*; Nakatsuji, Satoru*; Kondo, Akihiro*; Kindo, Koichi*; Kawamura, Naomi*; Mizumaki, Masaichiro*; et al.

Journal of Physics; Conference Series, 592(1), p.012020_1 - 012020_6, 2015/03

 Times Cited Count:1 Percentile:50.62

Valence fluctuation phenomena in rare-earth intermetallic compounds have attracted attention because the quantum criticality of the valence transition has been proposed theoretically. Recently, it was found that $$beta$$-YbAlB$$_4$$ shows quantum criticality without tuning and has a strong mixed-valence state. In this study, we measured the magnetization curve and X-ray magnetoabsorption in $$alpha$$-YbAl$$_{1-x}$$Fe$$_x$$B$$_4$$ ($$x=0.115$$), which is a locally isostructural polymorph of $$beta$$-YbAlB$$_4$$. The magnetization and X-ray experiments were performed in fields up to 55 and 40 T, respectively. A small increase in the Yb valence was observed at fields where the magnetization curve exhibited a change in slope.

Journal Articles

Fusion; The Energy of the Universe

McCracken, G.*; Stott, P.*; Iiyoshi, Atsuo*; Muraoka, Katsunori*; Nakai, Sadao*; Shimada, Michiya

Kaku Yugo; Uchu No Enerugi O Watashitachi No Te Ni, 326 Pages, 2015/00

Fusion; The Energy of the Universe, 2e is an essential reference providing basic principles of fusion energy from its history to the issues and realities progressing from the present day energy crisis. The book provides detailed developments and applications for researchers entering the field of fusion energy research. This second edition includes the latest results from the National Ignition Facility at the Lawrence Radiation Laboratory at Livermore, CA, and the progress on the International Thermonuclear Experimental Reactor (ITER) tokamak programme at Caderache, France.

Journal Articles

Stress analyses of the support structure and winding pack of the superconducting TF coil in National Centralized Tokamak

Tsuchiya, Katsuhiko; Kizu, Kaname; Takahashi, Hiroyuki*; Ando, Toshinari*; Matsukawa, Makoto; Tamai, Hiroshi

IEEE Transactions on Applied Superconductivity, 16(2), p.922 - 925, 2006/06

 Times Cited Count:1 Percentile:87.4(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Poloidal field coil configuration and plasma shaping capability in NCT

Matsukawa, Makoto; Tamai, Hiroshi; Fujita, Takaaki; Kizu, Kaname; Sakurai, Shinji; Tsuchiya, Katsuhiko; Kurita, Genichi; Morioka, Atsuhiko; Ando, Toshinari; Miura, Yushi

IEEE Transactions on Applied Superconductivity, 16(2), p.914 - 917, 2006/06

 Times Cited Count:4 Percentile:69.14(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Magnetic phase diagram and change in 5f electronic states in NpNiGa$$_{5}$$

Honda, Fuminori; Metoki, Naoto; Kaneko, Koji; Jonen, Shintaro; Yamamoto, Etsuji; Aoki, Dai*; Shiokawa, Yoshinobu*; Shiokawa, Yoshinobu; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1009 - 1010, 2006/05

 Times Cited Count:6 Percentile:66.64(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Confinement of alpha particles in a low-aspect-ratio tokamak reactor

Tani, Keiji; Tobita, Kenji; Iio, Shunji*; Tsutsui, Hiroaki*; Nishio, Satoshi; Aoki, Takayuki*

Denki Gakkai Rombunshi, A, 125(11), p.938 - 942, 2005/11

Studies on the loss of fusion produced alpha particles enhanced by toroidal field (TF) ripple in a low-aspect-ratio tokamak reactor (VECTOR) have been made by using an orbit-following Monte-Carlo code. The ripple loss is strongly reduced as the aspect ratio becomes low. Consequently, alpha particles are well confined in VECTOR. Thanks to the good confinement of alphas in a low-aspect-ratio system, the number of TF coils can be reduced to about 6, one half of the original VECTOR, by installing cooling systems near the outer edge of plasma and making allowances for about 30% increase in the bore diameter of TF coils.

JAEA Reports

Development of the device for 3D-measurement of the magnetic field profile in the toroidal direction

Yamamoto, Masahiro*; Tsuzuki, Kazuhiro; Kimura, Haruyuki; Sato, Masayasu; Shibata, Takatoshi; Okano, Fuminori; Suzuki, Sadaaki

JAERI-Tech 2005-060, 16 Pages, 2005/09


The low activation ferritic steel is one of the candidate for structural material of a demo-reactor. However, it was afraid that the plasma confinement and stability might degrade due to the error field by the ferromagnetic property of the ferritic material. So, on JFT-2M tokamak Advanced Material Tokamak EXperiment program (AMTEX) has been carried out to investigate about the conformity with the plasma and ferritic steel. AMTEX was performed by introducing low activation ferritic plates (FPs) step by step. At the third stage, the FPs were installed to cover almost whole inside wall (FIW) of the vacuum vessel (VV) as a simulation of the blanket wall.In this experiment the accurate measurement of the distribution of the magnetic fields strength was required before and after the installation of the FIW.Therefore, the device for 3D-measurement of the magnetic field profile along the toroidal direction was developed.

JAEA Reports

Cross-field flow of plasma produced by electron beam evaporation

Takayanagi, Tomohiro*; Ikehata, Takashi*; Mase, Hiroshi*; Oba, Hironori; Shibata, Takemasa

JAERI-Research 2005-024, 14 Pages, 2005/09


A weakly ionized plasma contained in the gadolinium atomic beam produced by electron beam heating was passed led to a magnetic field of 0$$sim$$$$pm$$1.5kG between iron cores. When the magnetic field was applied, the instability appeared in the ion saturation current. With increasing the magnetic field, the ions detected by the ion collectors decreased and no ions were detected at all. The magnetic field intensity at which the plasma does not flow and ions are not detected does not depend on plasma ion density. At this magnetic field, Larmor radius of ions are two times wider than plasma width. In addition, it is found that the plasma contained in the atomic beam can be removed by the magnetic field.

Journal Articles

Magnetoelastic coupling in the spin-dimer system TlCuCl$$_3$$

Johannsen, N.*; Vasiliev, A.*; Osawa, Akira; Tanaka, Hidekazu*; Lorenz, T.*

Physical Review Letters, 95(1), p.017205_1 - 017205_4, 2005/07

 Times Cited Count:21 Percentile:29.58(Physics, Multidisciplinary)

We present high-resolution measurements of the thermal expansion and the magnetostriction of TlCuCl$$_{3}$$ which shows field-induced antiferromagnetic order. We find pronounced anomalies in the field and temperature dependence of different directions of the lattice signaling a large magnetoelastic coupling. The phase boundary is extremely sensitive to pressure, e.g. the transition field would change by about $$pm$$ 185%/GPa under uniaxial pressure applied along certain directions. This drastic effect can unambiguously be traced back to changes of the intradimer coupling under uniaxial pressure. The interdimer couplings remain essentially unchanged under pressure, but strongly change when Tl is replaced by K.

Journal Articles

Magnetic field stabilization at the JAERI AVF cyclotron

Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Yoshida, Kenichi; Kashiwagi, Hirotsugu; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Ishibori, Ikuo; Nakamura, Yoshiteru; et al.

Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.745 - 747, 2005/07

no abstracts in English

Journal Articles

Field-induced transition between magnetically disordered and ordered phases in underdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$

Khaykovich, B.*; Wakimoto, Shuichi; Birgeneau, R. J.*; Kastner, M. A.*; Lee, Y. S.*; Smeibidle, P.*; Vorderwisch, P.*; Yamada, Kazuyoshi*

Physical Review B, 71(22), p.220508_1 - 220508_4, 2005/06

 Times Cited Count:68 Percentile:10.02(Materials Science, Multidisciplinary)

Magnetic field-induced transition between magnetically disordered and ordered phases in slightly under-doped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ with $$x=0.144$$ has been observed. Static incommensurate spin-density-wave order is induced above a critical field of about 3 T, as measured by elastic neutron scattering. These results are consistent with recently developed quantum phase transition scenario.

Journal Articles

Development of an innovative integrator being resistant to an excessive high voltage input at plasma instabilities

Kawamata, Yoichi; Yonekawa, Izuru; Kurihara, Kenichi

Heisei-16-Nendo Osaka Daigaku Sogo Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2005/03

no abstracts in English

Journal Articles

DNS of turbulent channel flow with MHD at high Reynolds number

Satake, Shinichi*; Kunugi, Tomoaki*; Naito, Norihito*; Takase, Kazuyuki; Ose, Yasuo*

Dai-18-Kai Suchi Ryutai Rikigaku Shimpojiumu Koen Yoshishu (CD-ROM), 4 Pages, 2004/12

no abstracts in English

280 (Records 1-20 displayed on this page)