Utilizing relativistic mirrors for photon-photon scattering

Koga, J. K.; Bulanov, S. V.; Esirkepov, T. Z.; Pirozhkov, A. S.; Kando, Masaki; Rosanov, N. N.*

Europhysics Conference Abstracts (Internet), 36F, p.O5.214_1 - O5.214_4, 2012/00

http://ocs.ciemat.es/EPSICPP2012PAP/pdf/O5.214.pdf

Energy confinement characterization of hydrogen and deuterium H-mode plasmas in JT-60U tokamak

Urano, Hajime; Takizuka, Tomonori*; Kikuchi, Mitsuru; Nakano, Tomohide; Fujita, Takaaki; Hayashi, Nobuhiko; Oyama, Naoyuki; Kamada, Yutaka; JT-60 Team

Europhysics Conference Abstracts (Internet), 36F, p.P1.016_1 - P1.016_4, 2012/00

http://ocs.ciemat.es/EPSICPP2012PAP/pdf/P1.016.pdf

Energy confinement properties for hydrogen and deuterium H-mode plasmas were examined in JT-60U. The energy confinement time became larger by a factor of 1.2-1.3 for deuterium than for hydrogen at a given . When the plasma energy was fixed, the profiles of density and temperature became identical for both cases while higher heating power was required for hydrogen. The ion conductive heat flux for hydrogen became approximately two times that for deuterium. Hence, the ion heat diffusivity for hydrogen was higher than for deuterium. It was found that the ion-temperature-gradient scale length became smaller by a factor of 1.2 for deuterium than for hydrogen.

Integrated modelling of JT-60SA scenarios with the METIS code

Giruzzi, G.*; Artaud, J. F.*; Joffrin, E.*; Garcia, J.*; Ide, Shunsuke; JT-60SA Research Plan Contributors; JT-60SA Team

Europhysics Conference Abstracts (Internet), 36F, p.P5.018_1 - P5.018_4, 2012/00

http://ocs.ciemat.es/EPSICPP2012PAP/pdf/P5.018.pdf

Approach for efficient linear MHD analysis without spectrum pollution in tokamaks

Aiba, Nobuyuki; Cooper, W.*; Gruber, R.*

Europhysics Conference Abstracts (Internet), 36F, p.P2.045_1 - P2.045_4, 2012/00

http://ocs.ciemat.es/EPSICPP2012PAP/pdf/P2.045.pdf

We developed a new numerical method for analyzing linear ideal MHD stability with higher-order finite element. Since the linear ideal MHD problem is a typical ill-posed problem from numerical viewpoints, a kind of numerical instability, called spectrum pollution, sometimes appears. About 30 years ago, a method realizing to suppress this numerical instability was developed, but this cannot fully suppress this. In fact, when the radial mesh number decreases, numerical instability appears. After revisiting this method, we found that the numerical integral method in this method is not appropriate for suppressing this instability. To fix this issue, we developed a new method with Gauss-Legendre quadrature, and realized to fully suppress numerical instability. This method can apply to the stability analysis with plasma rotation.