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Yuri, Yosuke
no journal, ,
no abstracts in English
Narita, Emi; Honda, Mitsuru; Yoshida, Maiko; Hayashi, Nobuhiko; Urano, Hajime; Ide, Shunsuke
no journal, ,
Toroidal rotation is the key to improve the energy confinement in tokamak plasmas. In JT-60U, it has been reported that electron heat transport is affected by the direction of toroidal rotation in the core region. In the plasma, an internal transport barrier is formed with the weak magnetic shear. Since the gradient of the radial electric field is weak in the core region, the effect of the gradient may be insignificant. In this study, it is shown that the change in the rotation direction can affect the linear growth rate by using the gyrokinetic flux-tube code GKW with the experimental parameters. In addition, the effects of the rotation direction are compared with the experiment, and physics mechanisms of changes in heat transport are discussed.
Fukui, Tokuro; Minato, Futoshi
no journal, ,
no abstracts in English
Honda, Mitsuru; Nakata, Motoki*
no journal, ,
Turbulent transport, which governs the profile evolution in a transport code, is calculated by theory-based physical models, but in the course of the model development, some of the physics are discarded. Recent enhancement of the computer resources enables us to perform turbulent transport calculations for a relatively moderate computational time conducted by a first-principle gyrokinetic code. This paper reports the development of the framework consisting of the tokamak transport code TRESS and the local gyrokinetic code GKV and preliminary results using this framework.
Sato, Shinichiro; Haruyama, Moriyoshi; Onoda, Shinobu; Teraji, Tokuyuki*; Isoya, Junichi*; Kada, Wataru*; Oshima, Takeshi; Hanaizumi, Osamu*
no journal, ,
no abstracts in English
Inoue, Shizuo; Shiraishi, Junya; Ide, Shunsuke; Matsunaga, Go; Isayama, Akihiko; Takechi, Manabu
no journal, ,
no abstracts in English
-paring state of multi-orbital ultra cold fermionic gasKobayashi, Keita; Ota, Yukihiro; Okumura, Masahiko; Yamada, Susumu; Machida, Masahiko
no journal, ,
no abstracts in English
Fujimori, Shinichi; Kobata, Masaaki; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi*; Yamagami, Hiroshi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*
no journal, ,
no abstracts in English
Ikeda, Takashi
no journal, ,
no abstracts in English
cluster mediaMatsui, Ryutaro; Fukuda, Yuji; Kawahito, Daiki*; Kishimoto, Yasuaki*
no journal, ,
In order to examine energy distributions of ions, by using the particle based integrated code, EPIC3D, we performed a 3D numerical simulation concerning an interaction between the high power laser and cluster media, where submicron-size H cluster is embedded in a background H gas at a laser intensity of 1.0
10
W/cm
. The simulation results shows that in addition to symmetric electric fields by the Coulomb repulsive force, asymmetric sheath electric fields are generated due to electrons pushed forward by the Lorenz force, JB. As a result, ions are accelerated forward up to approximately 100 MeV by the anisotropic electric field of Coulomb explosion which is the superposition of the symmetric electric field and the asymmetric sheath field.
Matsuoka, Seikichi; Idomura, Yasuhiro; Satake, Shinsuke*
no journal, ,
Effects of non-axisymmetric magnetic field perturbations in tokamak devices in which the magnetic field is axisymmetric have attracted much attention. The non-axisymmetric perturbations produces the so-called neoclassical toroidal viscosity (NTV), which is caused by collisional processes in a plasma. The NTV can make influence on the plasma rotation, which plays a key role in controlling a confinement performance and instabilities. Recently, however, it was pointed out that severe discrepancy exists with regard to the evaluation of the NTV between a Superbanana-plateau theory based on the bounce-averaged particle orbit and a global kinetic simulation. Clarifying physical mechanisms that causes the discrepancy is crucial for precise evaluation/prediction of the NTV. In this work, we perform two different types of global kinetic simulations, of which physical and numerical models are quite different from each other to resolve the issue. As a result, it is demonstrated that the discrepancy arises owing to the lack of the following two mechanisms in the theory; (1) insufficient resonance condition with regard to the precession drift, and (2) the transition processes of the particle orbit caused by the non-axisymmetric perturbations.
Moribayashi, Kengo
no journal, ,
no abstracts in English
Mori, Michiyasu
no journal, ,
no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Liu, X.*; Sakurai, Hiroshi*; Adachi, Misaki*; Shibayama, Akane*; Suzuki, Kosuke*
no journal, ,
no abstracts in English
Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Ogura, Koichi; Mori, Michiaki; Sakaki, Hironao; Kando, Masaki; Kondo, Kiminori
no journal, ,
no abstracts in English
Tsutsui, Kenji; Toyama, Takami*
no journal, ,
The spectra of the Resonant Inelastic X-ray Scattering at Oxygen K-edge on high-Tc superconductor cuprates are demonstrated by using large-scale numerical computations. The dependence on momentum transfer and carrier doping in the spectrum is discussed theoretically.
Kato, Shinichi; Harada, Hiroyuki; Takayanagi, Tomohiro; Horino, Koki; Tobita, Norimitsu; Ueno, Tomoaki*; Kinsho, Michikazu
no journal, ,
In the J-PARC RCS, the multi-turn charge-exchange injection scheme is adopted. In addition, the painting injection method which arranges the injection beam on the wide phase-space area during the multi-turn injection has been performed to expand the circulating beam. This method is essential to mitigate the beam loss caused by the particles scattered at the charge-exchange foil and the space charge force. This method is performed by the 4 horizontal and 2 vertical deflection magnets. Hence, the accuracy of the painting injection depends on the power adjustment precision of the magnet power supply. Therefore, the output power adjustment application was developed in order to achieve the high precise painting injection. This application was developed based on the examination results of the output characteristics of the power supply. As a result, the adjustment time was reduced and the adjustment precision was improved to twice of the original design value. After that, the painting injection adjustment was performed using the application. As a result, it was confirmed that the high precise painting injection was achieved.
Fukaya, Yuki
no journal, ,
no abstracts in English
Takeda, Masayasu; Suzuki, Junichi*
no journal, ,
no abstracts in English
Fe
AlO
studied by means of single-crystal neutron diffraction measurementsNakajima, Taro*; Tokunaga, Yusuke*; Matsuda, Masaaki*; Dissanayake, S.*; Fernandez-Baca, J. A.*; Kakurai, Kazuhisa; Taguchi, Yasujiro*; Tokura, Yoshinori*; Arima, Takahisa*
no journal, ,
no abstracts in English