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Recent progress in Large Helical Device experiments
Akio Komori,T. Shimozuma,T. Ido,T. Kobuchi,T. Seki,T. Ozaki,T. Fujita,T. Watari,T. Akiyama,T. Tokuzawa,T. Uda,T. Minami,Y. Nakamura,Y. Torii,Y. Sakamoto,Y. Takeiri,Y. Nagayama,Y. Oka,Y. Narushima,Y. Y 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In the Large Helical Device (LHD), some reactor-oriented experiments, i.e. high beta, high ion temperature, steady state operation, have produced remarkable progress in recent experimental campaigns. By optimizing the rotational transform, an average beta value of 4.3 %, which is the highest on record for helical devices, was achieved. The ICRF sustained steady-state discharges for more than 30 minutes, these were also successfully performed with the aid of the magnetic axis swing technique for the reduction of the heat load to the plasma-facing component. In the discharge, the total input energy to the plasma reached 1.3 GJ, which also established a new record.1
Literature Review on Recent Magnetocardiography and Impedance-MagnetocardiographyTechnologies
Y. Seki,A. Tsukamoto,K. Tsukada,Hitoshi Horigome,Miki Yokokawa,Yoshihide Chiba,Kimio Tanaka,A. Kandori,T. Miyashita,K. Ogata,D. Suzuki,K. Saito,K. Yokosawa,Satsuki Yamada,Shigeyuki Watanabe,Iwao Yamag 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
Variation of entanglement entropy in scattering process
Seki, Shigenori,Park, I.Y.,Sin, Sang-Jin Elsevier 2015 Physics letters: B Vol.743 No.-
<P><B>Abstract</B></P> <P>In a scattering process, the final state is determined by an initial state and an S-matrix. We focus on two-particle scattering processes and consider the entanglement between these particles. For two types initial states, <I>i.e.</I>, an unentangled state and an entangled one, we calculate perturbatively the change of entanglement entropy from the initial state to the final one. Then we show a few examples in a field theory and in quantum mechanics.</P>
Literature Review on Recent Magnetocardiography and Impedance-Magnetocardiography Technologies
Kandori, A.,Miyashita, T.,Ogata, K.,Seki, Y.,Suzuki, D.,Tsukamoto, A.,Saito, K.,Yokosawa, K.,Tsukada, K.,Yamada, Satsuki,Watanabe, Shigeyuki,Horigome, Hitoshi,Yamaguchi, Iwao The Korean Superconductivity Society 2006 Progress in superconductivity Vol.8 No.1
We have developed magnetocardiography(MCG) and impedance magnetocardiography(I-MCG) for detecting heart disease by using dc-SQUID technology. The MCG system, using low-Tc SQUID, is being applied commercially for diagnosing heart disease. Using the low-Tc MCG system, many clinical studies on detection of abnormality have been performed. Furthermore, we have developed a portable MCG system using high-Tc SQUID. For detecting changes in kinetic impedance in the heart, an I-MCG system has been demonstrated. The I-MCG system could detect the mechanical movement of the heart. In this report, we review current clinical applications of magnetocardiography and impedance magnetocardiography.
Electron heating experiment using the high harmonic fast wave on LHD
hiroshi Kasahara,K. Saito,N. Takeuchi,R. Kumazawa,T. Seki,T. Mutoh,T. Oosako,Y. Takase 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Electron heating experiments using the High Harmonic Fast Wave (HHFW) were performed on the Large Helical Device (LHD). An electron temperature increase from 2.5 keV to 3.6 keV by 1.2 MW of HHFW was observed when both ECH and NBI were used to create a target plasma with high stored energy and electron temperature. When ECH works effectively, the electron density is pumped out, but the rate of decrease of the electron density is reduced when HHFW heating is applied. This result indicates that HHFW is absorbed effectively when the central electron temperature and electron beta are high enough, and suggests that parallel heating of electrons by HHFW reduces electron density pump out caused by perpendicular electron heating by ECH. According to a 1-D calculation, raising the density is more effective for improving singlepass damping than raising the temperature. According to a 2-D full-wave calculation, electron damping occurs in an off-axis region at low density, but wave fields become more concentrated in the core and absorption becomes more centrally localized at high density.e
Polymer surfaces studied by sum - frequency vibrational spectroscopy
D. Kim,J. Sung,H. M. Cheong,C. N. Whang,Y. Ouchi,T. Iimori,N. Matsuie,K. Seki 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
Sum-frequency vibrational spectroscopy has recently been used to investigate the surface of the various polymers and was able to find the chemical compositions and structures specific to the surface. Here we report our studies on two specific polymer samples to demonstrate its capability. Polyimide thin films were made by spin coating on fused quartz and CaF₂ substrates. The sum-frequency signal originating mainly from the air/polymer interface showed markedly different spectra, indicating the structural change of the polymer surface depending on the underlying substrate. Various polyethylene surfaces were also investigated by sum-frequency vibrational spectroscopy. The surface of polyethylene samples in the CH-region showed different sum-frequency spectra, presumably due to the trace amount of additives having much higher concentration at the air/polymer interface. These examples demonstrate the surface and interface of the polymer could have different structure and chemical composition from those of a bulk, which can be studied effectively by surface nonlinear optical spectroscopy.
Fine Impedance Matching by Use of Liquid Stub Tuners in ICRF Experiment on LHD
kenji Saito,C. Takahashi,H. Takeuchi,J. G. Kwak,J. S. Yoon,M. Yokota,R. Kumazawa,T. Seki,T. Mutoh,Y. P. Zhao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
An impedance-matching system with liquid stub tuners was developed for high-power, long-pulse ICRF injection in LHD. In order to predict the optimum liquid heights, a loading resistance and an effective length were calculated. We used a complex reflection coefficient measured at a directional coupler attached to the outlet of an oscillator. The effective length changed, as well as the loading resistance, when the plasma condition was changed. Moreover, the effective length changed during long-pulse ICRF injection. By using the loading resistance and the effective length, the liquid heights for impedance matching were calculated and the reflected power was reduced in discharges having similar plasma parameters. Application of this method to real-time feedback control for long-pulse discharges is now being prepared.