Proceedings of the 16th Symposium on Advanced Photon Research; October 15-16, 2015, Kizugawa, Kyoto, Japan

Secretariat of Symposium on Advanced Photon Research

JAEA-Conf 2016-001, 53 Pages, 2016/03

JAEA-Conf-2016-001.pdf:6.17MB

The 16th Symposium on Advanced Photon Research was held at Kansai Photon Science Institute, Japan Atomic Energy Agency (JAEA-KPSI) in Kizugawa city, Kyoto on October 15 - 16, 2015. This report consists of invited and contributed papers presented at the oral and poster sessions in the Symposium.

Valence state in Ce-based heavy fermion compounds at high magnetic fields

Matsuda, Yasuhiro*; Her, J.-L.*; Michimura, Shinji*; Inami, Toshiya; Ebihara, Takao*; Amitsuka, Hiroshi*

JPS Conference Proceedings (Internet), 3, p.011044_1 - 011044_6, 2014/06

https://doi.org/10.7566/JPSCP.3.011044

Synchrotron X-ray absorption spectroscopy of CeRhSi has been performed in pulsed high magnetic fields of up to 32 T. The Ce valence is slightly larger than 3+ at 5 K and decreases with increasing magnetic above 20 T. The field-induced valence change seems to correspond to the metamagnetic transition in the magnetization process. This phenomena is similar to our previous result on CeRuSi and seems to be common in Ce-based heavy fermion compounds.

High-pressure induced structural changes in metastable GeSbTe thin films; An X-ray absorption study

Fons, P.*; Kolobov, A.*; Tominaga, Junji*; Katayama, Yoshinori

Nuclear Instruments and Methods in Physics Research B, 238(1-4), p.160 - 162, 2005/08

https://doi.org/10.1016/j.nimb.2005.06.039

Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in GeSbTe (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.

Advanced control scenario of high-performance steady-state operation for JT-60 superconducting tokamak

Tamai, Hiroshi; Kurita, Genichi; Matsukawa, Makoto; Urata, Kazuhiro*; Sakurai, Shinji; Tsuchiya, Katsuhiko; Morioka, Atsuhiko; Miura, Yushi; Kizu, Kaname; Kamada, Yutaka; et al.

Plasma Science and Technology, 6(3), p.2281 - 2285, 2004/06

https://doi.org/10.1088/1009-0630/6/3/003

High performance steady-state operation for JT-60SC are evaluated by the TOPICS analysis. 5 and bootstrap current fraction 86% is kept steady at I=1.5 MA, B=2 T by neutral beam power of 11 MW. The ERATO-J analysis shows that the external-kink mode with multiple toroidal mode numbers of n=1 and n=2 is stable at 5.5 at the average ratio of conducting wall radius to plasma minor radius of about 1.2 with the wall stabilisation effect. Resistive wall modes, induced by a close location of the wall to plasma, is expected to be suppressed by the active feedback stabilisation with a set of non-axisymmetric field coils behind the stabilising plates. Further optimisation for the high- accessibility by the plasma shaping is performed with the TOSCA analysis. The plasma shaping factor defined as S=(I/aB)q and strongly correlated to the plasma elongation and triangularity, is scanned from 4 to 6, which extends the availability of current and pressure profile control for the high performance plasma operation.

Design of a dipole magnet for the 3-GeV proton synchrotron of the JAERI/KEK joint project

Tani, Norio; Kanazawa, Kenichiro; Shimada, Taihei; Suzuki, Hiromitsu; Watanabe, Yasuhiro; Adachi, Toshikazu*; Someya, Hirohiko*

Proceedings of 8th European Particle Accelerator Conference (EPAC 2002), p.2376 - 2378, 2002/00

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400 MeV to 3 GeV at a repetition rate of 25 Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a large leakage field at an end part than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components: e.g. a coil, magnet end plates and etc. We intend to use a stranded conductor as a coil conductor so that the eddy current induced in the coil can be reduced. On the other hand, the eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of the large leakage field and the eddy current to the beam motion around the magnet end part. We have constructed a prototype dipole magnet and field measurement system for this purpose. This paper reports the results of the design and the preliminary test about this magnet.

Development of jelly-roll NbAl conductor and its properties

Ando, Toshinari

Teion Kogaku, 32(2), p.38 - 46, 1997/00

https://doi.org/10.2221/jcsj.32.38

no abstracts in English

Charging test results of the DPC-TJ, a high-current-density large superconducting coil for fusion machines

*; Wachi, Y.*; Shimada, M.*; *; *; Hamajima, Takataro*; Fujioka, T.*; Nishi, Masataka; Tsuji, Hiroshi; Ando, Toshinari; et al.

IEEE Transactions on Applied Superconductivity, 3(1), p.480 - 483, 1993/03

https://doi.org/10.1109/77.233747

no abstracts in English

Design of 18-GHz ECR ion source at JAERI

Yokota, Wataru; Saito, Yuichi; Ishii, Yasuyuki; Nara, Takayuki; Arakawa, Kazuo

Proc. of the 11th Int. Workshop on Electron Cyclotron Resonance Ion Sources; ECRIS 11, p.245 - 248, 1993/00

no abstracts in English

Design of JAERI 18-GHz ECR ion source

Yokota, Wataru; Saito, Yuichi; Ishii, Yasuyuki; Nara, Takayuki; Arakawa, Kazuo

Proc. of the 9th Symp. on Accelerator Science and Technology, p.92 - 94, 1993/00

no abstracts in English

Development of a 240mm bore-13T superconducting coil for large scale conductor testing

Nishi, Masataka; Ando, Toshinari; Isono, Takaaki; Sugimoto, Makoto; Koizumi, Norikiyo; Yoshida, Kiyoshi; Kawano, Katsumi; Takahashi, Yoshikazu; *; Tsuji, Hiroshi; et al.

IEEE Transactions on Magnetics, 28(1), p.597 - 600, 1992/01

https://doi.org/10.1109/20.119947

no abstracts in English