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Journal Articles

Effects of local toroidal field ripple due to test blanket modules for ITER on radial transport of thermal ions

Oyama, Naoyuki; Urano, Hajime; Shinohara, Koji; Honda, Mitsuru; Takizuka, Tomonori; Hayashi, Nobuhiko; Kamada, Yutaka; JT-60 Team

Nuclear Fusion, 52(11), p.114013_1 - 114013_9, 2012/11

 Times Cited Count:4 Percentile:20.17(Physics, Fluids & Plasmas)

Effects of local toroidal field (TF) ripple due to test blanket modules (TBMs) for ITER on radial transport of thermal ions are investigated using fully three-dimensional magnetic field orbit following Monte Carlo (F3D-OFMC) code. The simulation under ITER plasma condition indicates that the additional losses caused by the localized TF ripple due to TBMs linearly increase with number of TBMs. When the amplitude of local TF ripple in one TBM port is increased, on the other hand, the additional losses increase quickly. A comparison of the number of lost particles suggests that a condition with three TBM ports corresponds to 1.7 times of ripple amplitude at one TBM port.

Journal Articles

Numerical analysis of key factors for the appearance of grassy ELMs in tokamak plasmas

Aiba, Nobuyuki; Oyama, Naoyuki

Nuclear Fusion, 52(11), p.114002_1 - 114002_8, 2012/11

 Times Cited Count:13 Percentile:54.89(Physics, Fluids & Plasmas)

In this paper, we developed a simplified model that is used for the MHD stability analysis with the kinetic effects, and applied this to the numerical analysis of small amplitude ELM, called grassy ELM. As the result, we found that the stabilizing effect due to the ion diamagnetic drift can be canceled by taking into account the plasma compressibility and the electron diamagnetic drift, and this cancelation moves the stability boundary of small ELM closer to the ideal ballooning stability boundary. This trend is consistent with the experimental results of JT-60U grassy ELM plasma, and implies that the short-wavelength electromagnetic instability like ideal ballooning mode is thought as the origin of grassy ELM.

Journal Articles

Momentum transport studies from multi-machine comparisons

Yoshida, Maiko; Kaye, S.*; Rice, J.*; Solomon, W.*; Tala, T.*; Bell, R. E.*; Burrell, K. H.*; Ferreira, J.*; Kamada, Yutaka; McDonald, D. C.*; et al.

Nuclear Fusion, 52(12), p.123005_1 - 123005_11, 2012/11

 Times Cited Count:16 Percentile:62.38(Physics, Fluids & Plasmas)

The purpose of this study is to find a common feature on momentum transport coefficients including diffusive and non-diffusive terms in all machines. The momentum database enables us to assess a parametric dependency of momentum transport in a wider range of dimensionless parameters related to transport. Such observation will contribute to make a scaling/modeling on momentum transport for future devices like ITER and DEMO. On the other hand, the investigation of a difference in observation by comparing the experimental conditions will give a useful information to realize what plasma parameter is the key for the momentum transport coefficients.

Journal Articles

Modifications to the edge radial electric field by angular momentum injection in JT-60U and their implication for pedestal transport

Kamiya, Kensaku; Honda, Mitsuru; Miyato, Naoaki; Urano, Hajime; Yoshida, Maiko; Sakamoto, Yoshiteru; Matsunaga, Go; Oyama, Naoyuki; Koide, Yoshihiko; Kamada, Yutaka; et al.

Nuclear Fusion, 52(11), p.114010_1 - 114010_12, 2012/10

 Times Cited Count:10 Percentile:45.75(Physics, Fluids & Plasmas)

Depending on the direction of the external tangential momentum input, substantial changes in not only toroidal but also poloidal flows for the carbon impurity ions are observed at around the $$E$$$$_{r}$$-well region. The shear in the edge $$E$$$$_{r}$$ becomes wider in the co-NBI case, while the edge $$E$$$$_{r}$$-well becomes deeper in the counter-NBI case.

Oral presentation

On extension of the gyrokinetic quasi-neutrality condition towards the long wavelength regime

Miyato, Naoaki; Scott, B. D.*; Yagi, Masatoshi

no journal, , 

Oral presentation

Heat transport of hydrogen and deuterium H-mode plasmas in JT-60U

Urano, Hajime; Takizuka, Tomonori; Fujita, Takaaki; Kamada, Yutaka; Nakano, Tomohide; Oyama, Naoyuki

no journal, , 

Confinement and transport properties for hydrogen and deuterium H-mode plasmas were investigated. Exponential degradation of confinement with increased power was observed for both hydrogen and deuterium plasmas. But, stored energy for deuterium becomes larger by the factor of 1.7 than that for hydrogen at a given power. At the same energy, profiles of electron density, electron temperature, ion temperature are almost identical between hydrogen and deuterium plasmas. Power scan experiments using hydrogen and deuterium plasmas indicates the energy confinement becomes larger with increased rho*. On the other hand, dimensionless analysis based on deuterium plasmas shows the gyro-Bohm type diffusion.

Oral presentation

Integrated simulation study of ELM pacing by pellet injection with TOPICS-IB

Hayashi, Nobuhiko; Aiba, Nobuyuki; Takizuka, Tomonori; Oyama, Naoyuki

no journal, , 

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