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h Ninomiya,T. Imai,T. Fujii,T. Suzuki,T. Fujita,T. Yamamoto,Y. Uesugi,Y. Kamada,Y. Takase,Y. Kudo,Y. Miura,Y. Ikeda,Y. M. Miura,A. Shimizu,A. Kimura,A. Morioka,A. Nishimura,A. Sagara,G. Kurita,H. Kubo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The NCT Program, in which the present JT-60U is being modified into a superconducting coil machine, is discussed under nationwide collaboration in Japan. Its mission is to establish high-beta steady-state operation for DEMO and to contribute to ITER. NCT is designed to have potential to investigate such research.
Review and Prospect of Ferroelectricity and Magnetism in YMn2O5
Y. Noda,H. Kimura,I. Kagomiya,K. Kohn,N. Ikeda,S. Matumoto,T. Shobu,Y. Fukuda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
YMn2O5 undergoes ferroelectric successive phase transitions at 39 K and 19 K, in which a dielectric constant shows anomalies. Spontaneous polarization was also observed. Just above these ferroelectric phase transition temperatures, at 45 K, antiferromagnetic order occurs. Neutron elastic measurements and magnetic susceptibility measurements reveal that the ferroelectric phase transition at 39 K and 19 K occurs simultaneously with the change of magnetic ordering pattern. Review of experimental results and conjecture for the origin of spontaneous polarization are given.??
Characteristics of Beam Attenuation in the High Temperature Plasma with High-Z Discharge in LHD
katsunori Ikeda,K. Tsumori,K. Nagaoka,M. Osakabe,O. Kaneko,S. Morita,Y. Oka,Y. Takeiri 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Behavior in attenuation of a high-energy neutral beam has been investigated by visible spectroscopy in the Large Helical Device (LHD). The measurement system consists of optical fibers, a spectrometer and an ICCD detector. A spectrum of beam emission is clearly observed by the Doppler effect. In order to increase the ion-heating power, we have adopted a high-Z discharge with argon gas. An ion temperature of 13.5 keV ± 2 keV is achieved by the injection of a neutral beam power of 10.5 MW. We have observed the behavior of the neutral beam emission in the high-temperature plasma. The intensity of the beam emission in the argon discharge is lower than that in the hydrogen discharge when the ion temperature increases. After the maximum ion temperature, the intensity of the beam emission increases as the electron density increases. This behavior is similar to the hydrogen discharge. It is indicated that the particle configuration of the plasma has changed. This result will contribute to the monitoring of the neutral beam absorption in fusion plasma.
박용구(Park, Y. G.),김주희(J.H. Kim),Ikeda Namiko(N.Ikeda),신동일(D.I. Shin) 한국차학회 2001 한국차학회지 Vol.7 No.1
It has been known that both Korean and Japanese wild tea were introduced from China around AD 800. However, the original population from which they were introduced was not confirmed, yet. We investigated the morphological and genetic variations using RAPD of Korean and Japanese wild tea plants and compared with their genetic differences based on the results. Twenty two superior individuals from 19 wild tea populations of Korea were selected and 19 superior cultivars of Japan were introduced for this study. Seeds collected from 6 wild populations of Korea were planted in Tea Experimental Station in Japan at 1994 and the progenies were compared with 6 year old Japanese wild tea seedlings. Characteristics of leaf morphology of Korean wild tea plants were similar to those of Chinese small leaf variety while Japanese wild tea revealed to be more tolerant to cold. Japanese cultivars have thick leaf that indicates a higher yield. Most conspicuous difference was seen in the flower structure which means a different breeding pattern in Korean and Japanese populations. RAPD results clearly demonstrated the difference between Korean and Japanese wild populations. From the results, we concluded that there are significant genetic differences between Korean and Japanese wild tea populations and, therefore, the original populations from which they were introduced are different.
Test of Lorentz invariance with atmospheric neutrinos
Abe, K.,Haga, Y.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kishimoto, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Tanaka, H.,Tomura, T. American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.5
Lattice Modulation in YMn2O5 and TbMn2O5 Studied by Using Synchrotron Radiation X-rays
Yukio Noda,H Kimura,H Sawa,K Kohn,N Ikeda,S Kobayashi,Y Ishikawa,Y Kamada,Y Wakabayashi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
RMn2O5 (R = Y and rare earth) shows successive magnetic and ferroelectric phase transitions at about 45 K, 40 K, 39 K, 20 K and 10 K and is called a multiferroic compound. We have investigated the lattice modulation vectors (qL) of YMn2O5 and TbMn2O5 by using single crystal Synchrotron Radiation X-ray diraction and compared them with the magnetic propagation vectors (qM) studied by neutron diraction. The relation of the propagation vectors between magnetic materials and dielectrics is found to be qL = 2qM. A preliminary structure analysis of the atomic displacement pattern in the commensurate ferroelectric phase of TbMn2O5 is discussed.fb