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Measurements of charge exchange neutral particles in Heliotron J
masashi Kaneko,F. Sano,H. Okada,K. Hanatani,K. Nagasaki,K. Kondo,S. Kobayashi,S. Murakami,T. Mizuuchi,Y. Suzuki,Y. Nakamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The ion behavior in Heliotron J plasmas is investigated through measurements of the ion energy distribution function, which is measured with a charge-exchange neutral particle analyzer system. The bulk ion temperature is estimated from the measured energy spectrum. In NBI heated plasma, the pitch angle distribution of energy spectra is measured. Dependence of the high energy tail and bulk ion temperature of injection power is investigated in an ion-cyclotron range of frequency heating experiment.)
Kim, S. B.,Saito, A.,Kaneko, T.,Joo, J. H.,Jo, J. M.,Han, Y. J.,Jeong, H. S. IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>In the case of motors and generators, the benefits of using superconductors could be represented by the reduction of 50% in both losses and sizes compared to the conventional machines of the same rating. The high temperature superconducting (HTS) coils wound with HTS conductors have very low normal zone propagation velocity (NZPV) and complicated quench behaviors because the conductors have a low thermal conductivity and large specific heat. According to these reasons, in case of HTS coils and magnets, it is difficult to expect the self-protection like as low temperature superconducting (LTS) coils. In this paper, we suggest a method which inserts the Cu tape between turn-turn winding in the HTS coil instead of electrical insulation to improve the self-protection ability of HTS coils. Because the thermal and electrical contacts along the transverse direction are enhanced by inserted Cu tape instead of insulator and the whole thermal stability of HTS coils would be increased. To clarify the quench behavior of this suggested coil, we investigate the normal-zone propagation properties of the fabricated HTS pancake coils wound with 2G conductor and Cu tape under the cryocooled operation using GM cryocooler. The effects of inserted Cu tape and the improved the self-protection ability for the suggested HTS coil will be discussed.</P>
Kim, S.B.,Kaneko, T.,Saito, A.,Kajikawa, H.,Joo, J.H.,Jo, J.M.,Han, Y.J.,Jeong, H.S. North-Holland 2013 Physica. C, Superconductivity Vol.484 No.-
The high temperature superconducting (HTS) coils have very low normal zone propagation velocity (NZPV) and complicated quench behaviors. Because of these reasons, it is difficult to expect the self-protection. In this paper, two methods are suggested to improve the self-protection ability of HTS coils. One is to remove the insulation between turn-turn winding in HTS coils to enhance the thermal and electrical contacts along transverse direction and to increase the whole thermal stability of them. The other is Cu or Brass tapes are wound with HTS tape wire instead of the insulation to improve the thermal, electrical and mechanical stability of the HTS coils. To clarify the quench behaviors of the suggested coils, the normal zone propagation properties of the fabricated non-insulated HTS pancake coils were shown by measured voltage and temperature traces during the quench as a function of the operating temperature. And the characteristics of the normal transition and amount of the shared current to adjacent layers were quantitatively measured by a Hall sensor located at the center of HTS coils to measure the change of the self-magnetic field by operating current. The current sharing behaviors in the non-insulated HTS coil and the coil with Cu tape inserted were observed. The minimum quench energy (MQE) of the HTS coil with Cu tape inserted was the largest in the tested coils. It means that the HTS coil with Cu tape inserted had the highest transient stability against the thermal disturbances among the tested coils and the improvement of self protection abilities was proved.
Prediction of Blast Furnace Operation using On-line Bayesian Learning
N.Kaneko,S.Sakamoto,K.Uchida,H.Ogai,M.Ito,S.Matsuzaki 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The large scale database-based online modeling, called LOM, is a type of Just-In-Time modeling for blast furnace. In this paper, we propose a new type of LOM using a nonlinear local model to improve the performance of the long-term prediction. To estimate the parameter of the nonlinear local model, we use on-line Bayesian learning scheme with Sequential Monte Carlo. The prediction performance of the new LOM is demonstrated by using the real process data of blast furnace.
Kim, M.-S.,Klopfenstein, N. B.,Ota, Y.,Lee, S. K.,Woo, K.-S.,Kaneko, S. Blackwell Publishing Ltd 2010 Forest pathology Vol.40 No.3
<P>Summary</P><P>This article briefly reviews the history of white pine blister rust, attributed to <I>Cronartium ribicola</I>, and addresses current research and management issues in South Korea, Japan and other regions of eastern Asia (China, Russia and Himalaya). For each region, the distribution, damage, aecial hosts, telial hosts and management of <I>C. ribicola</I> and other blister rust fungi on native and introduced white pines are summarized. In addition, blister rust behaviours in eastern Asia and North America are compared; and the potential evolutionary and management implications are discussed.</P>
Extending the dynamic range of electronics in a Time Projection Chamber
Estee, J.,Lynch, W.G.,Barney, J.,Cerizza, G.,Jhang, G.,Lee, J.W.,Wang, R.,Isobe, T.,Kaneko, M.,Kurata-Nishimura, M.,Murakami, T.,Shane, R.,Tangwancharoen, S.,Tsang, C.Y.,Tsang, M.B.,Hong, B.,Lasko, P. Elsevier 2019 Nuclear instruments & methods in physics research. Vol.944 No.-
<P><B>Abstract</B></P> <P>When Time Projection Chambers (TPCs) are used in low to intermediate heavy ion collisions, the mass and momentum range of the emitted particles cover a wide range in energy losses. Many TPC readout electronics currently only have a single gain output with a fixed dynamic range. In a recent set of experiments using the SAMURAI Pion-Reconstruction and Ion-Tracker (S π RIT) TPC, it was important to simultaneously measure relativistic pions and heavy ion tracks from the same collisions. As the ionization from a track’s energy loss is collected and multiplied by the anode wires, a distribution of image charges is induced on the TPC read-out pads. If the avalanche on a wire is large enough, the charge collected by pads directly underneath will saturate the readout electronics; pads farther away in the distribution will not be saturated. Using these unsaturated pads and the known pad distribution function, we can estimate the charge on saturated pads, increasing the dynamic range by a factor of 5.</P>
Configuration Dependence of Toroidal Current in Heliotron J
gen Motojima,F. Sano,H. Yabutani,H. Okada,H. Nakamura,H. Arimoto,H. Kitagawa,H. Yamazaki,K. Kondo,K. Nagasaki,K. Hanatani,K.Y. Watanabe,M. Kaneko,M. Uno,S. Fujikawa,S. Watanabe,S. Yamamoto,S. Kobayash 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A change of toroidal current by controlling the magnetic configuration has been observed in Heliotron J. The effect of the magnetic configuration on the neoclassical bootstrap current has been theoretically investigated for Heliotron J. It is found that the bumpy field component (B04) plays an important role in changing both the value and the direction of the bootstrap current in Heliotron J. The bootstrap current density is reversed at the small minor radius first, and then the net bootstrap current changes its direction from a positive value to a negative value as B04 decreases.
PRESSURE DEPENDENCE OF THE CURIE TEMPERATURE IN MnAlGe
S. Endo,H. Matsuzaki,F. Ono,T. Kanomata,T. Kaneko 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The pressure dependence of the Curie temperature was determined in 2dimensional like ferromagnet, MnAlGe up to a maximum pressure of 7.5 ㎬ through measurements of electric resistance vs temperature curves. The pressure coefficient was positive with a considerably high rate of 9 K/㎬ in the low pressure ragion, while it decreased gradually down to one order of magnitude smaller value at the maximum pressure. It was concluded that ther is an upper limit of about 550 K in the super-exchange type ferromagnetic interaction between Mn layers.