最新トピックス
最近の論文紹介 (page.3) (2008年～2011年)
"Visualization of ThreeDimensional MHD Simulation Data to Study Fine
Unstable Motions in a Helical Torus Device"
H. Miura,
IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol.39 (2011)
Isosurfaces of the pressure in a 3D MHD simulation of a hot magnetized
plasma dominated by the ballooning instability are visualized. The flutelike
structures of the isosurfaces indicates growth of the ballooning mode.
The yellow circle indicates the tangential port of the LHD. 
"Equilibria of toroidal plasmas with toroidal and poloidal Flow in
highbeta
reduced magnetohydrodynamic models"
A. Ito and N. Nakajima,
Nuclear Fusion Vol.51, 123006 (2011)
GradShafranov type equations for highbeta toroidal equilibria with toroidal
and poloidal flow, twofluid and finite Larmor radius effects and pressure
anisotropy. 
"Scientific Visualization of Plasma Simulation Results and Device Data in VirtualReality Space"
H. Ohtani, Y. Tamura, A. Kageyama, and S. Ishiguro,
IEEE Transactions on Plasma Science Special Issue  Images in Plasma Science
2011, Vol.39 (11) 24722473 (2011)
Scientific visualization of the equilibrium plasma in the Large Helical
Device (LHD) with the realistic description by the virtualreality system
`CompleXcope.' Blue surface shows the isosurface of plasma pressure. Green
and magenta lines are the single magneticfield line and single particle
orbit, respectively. 
"Hybrid Simulation between Molecular Dynamics and Binary Collision
Approximation Codes for Hydrogen injection into Carbon Materials"
S. Saito, A. M. Ito, A. Takayama, T. Kenmotsu, and H. Nakamura,
Journal of Nuclear Materials, doi:10.1016/j.jnucmat.2010.12.233, (2011)
The left panel shows thirty trajectories of incident hydrogen that moves
in a graphite material calculated by BCAMD hybrid simulation. The gray
and black lines in the left panel are obtained by the binary collision
approximation (BCA) and the molecular dynamics (MD) simulation, respectively.
The right panel shows a detailed image of the MD simulation part. 
"Multiscale simulation for plasma science"
S. Ishiguro, S. Usami, R. Horiuchi, H. Ohtani, A. Malukov, and M. M. Skoric,
Journal of physics: Conference Series Vol. 257, 012026 (2010)
Structure of primal Equation Free Projective Integration PlasmaSimulation. 
"Simulation Data Analysis by Virtual Reality System"
H. Ohtani, N. Ohno, N. Mizuguchi, M. Shoji, and S. Ishiguro,
Plasma and Fusion Research Vol.5, S2109 (2010)
Scientific visualization of both simulation result and experimental device
data. This is the view from outside of LHD vessel device.Simulation result
about LHD is obtained by MHD simulation, and pressure profile is shown
as green isosurface. 
"Simulation of feedback instability in the coupled magnetosphereionosphere system"
Hiroki Hasegawa, Nobuaki Ohno, and Tetsuya Sato,
Journal of Geophysical Research Vol.115, A08304 (2010)
The left panel shows the distribution of the fieldaligned current density
perturbation at the ionospheric height, which is obtained by a nonlinear
simulation. The right panel represents the distribution of the linear growth
rate calculated from the quasisteady state data through the integrated
feedback instability theory. This figure indicates that the areas where
longitudinally striated structures appear are consistent with the prediction
by the theory. 
"Influences of ballooning modes with moderate wave number on MHD equilibrium
in LHD"
H. Miura and N. Nakajima,
Nuclear Fusion Vol.50, 054006 (2010)
A 3D view of a full3D MHD simulation of LHD. Contours of the pressure
are drawn on the poloidal crosssection.The red region represents β = p/(B_{0}^{2} /2) = 3.7% , while the green colour is p/(B_{0}^{2} /2) = 1%. 
"Magnetic Reconnection Controlled by MultiHierarchy Physics in an
Open System"
R. Horiuchi, S. Usami, H. Ohtani, and T. Moritaka,
Plasma and Fusion Research Vol.5, S2006 (2010)
Spatial profiles of E + v_{e} x B (left), B_{x}/T_{e} (middle), and offdiagonal component of electron pressure tensor P_{eyz} (right) in the (y, z) plane in the presence of driftkink instability.

"Improved Open Boundary Model for Plasma Particle Simulations"
Hiroki HASEGAWA and Tetsuya SATO
Plasma and Fusion Research Vol.5, 020 (2010)
This figure shows the result of a test simulation. The top, middle, and
bottom panels present the spatial profile of electric potential and distributions
of electrons and ions in spacevelocity phase space, respectively. This
result indicates that double layer creation by ionacoustic instability
also occurs in a case where the electron drift velocity is comparable to
the electron thermal velocity. 
"First Demonstration of Collisionless Driven Reconnection in a MultiHierarchy Simulation"
S. Usami, H. Ohtani, R. Horiuchi, and M. Den,
Plasma and Fusion Res. Vol.4, 049 (2009)
Magnetic lines of force and fluid velocity vectors in a multihierarchy
simulation. 
"EquationFree Coarse Grained Projective Integration Method for MultiScale
Plasma Simulation"
ISHIGURO Seiji and SKORIC Milos, M.
J. Plasma Fusion Res. Vol.85, 593596 (2009)
Concept of EquationFree Projective Integration Method. 
"Relativistic LaserPlasma Interactions"
Milos M. Skoric
AIP Conf. Proc. Vol.1188, 1534 (2009)
NEW DEVELOPMENTS IN NONLINEAR PLASMA PHYSICS
Snapshots of spatial laser pulse energy from 1D Fluid (left) and 2D PIC
(right) simulations show strong spatial modulation, depletion and pulse
breakup due to backward SRS. 
"Generation control of fast electron beam by low density foam for FIREXI"
H. Sakagami, T. Johzaki, H. Nagatomo, and K. Mima
Nucl. Fusion, Vol.49, 075026 (2009)
Maximum averaged core electron temperatures as a function of foam density.
Red circle, blue triangle, purple square and green diamond indicate the
foam thickness of 40, 60, 70 and 80 micron, respectively. 
"Open Boundary Condition for Particle Simulation in Magnetic Reconnection Research"
H.Ohtani and R.Horiuchi
Plasma and Fusion Research Vol.4 (2009) 024.
Comparison of the results of short (top) and long (bottom) simulation boxes to check whether the open boundary condition fulfills its function. The results of the short simulation box effectively mimic those of the long simulation box. 
"Analytic highbeta tokamak equilibria with poloidalsonic flow"
A. Ito and N. Nakajima,
Plasma Phys. Control. Fusion Vol.51, 035007 (2009)
Pressure isosurfaces (black) and magnetic flux surfaces (gray) for (a)
suband (b) superpoloidalsonic flows. 
"Electron Force Balance in Steady CollisionlessDriven Reconnection"
B. Li and R. Horiuchi,
Physical Review Letters Vol.101, 215001 (2008)
Spatial profiles of each term in the z direction(top) and inflow direction
(bottom) of the electron momentum equation along the vertical line passing
the X point in the steady state. 


