[en] Full text: Magnetic island formation is experimentally investigated in the Large Helical Device (LHD). An error field or the external field generates the seed island. The island shrinks as the electron temperature or the beta increases in the case of lower magnetic hill, but it grows in the case of higher magnetic hill. An evidence of (m,n)=(1,1) current in the magnetic island is obtained, where m and n are the poloidal and the toroidal mode numbers, respectively. (author)

[en] Full text: The ITER Test Blanket Working Group (TBWG) has restarted its activity in October 2003 in order to reassess breeding blanket testing program and necessary R and D collaboration taking into account the need of the present six ITER Parties and the recent progress of breeding blanket technology. All parties agree on the extreme importance of breeding blanket testing in ITER. The main objectives of the work of the TBWG are to establish a meaningful and coordinated testing program and to fully define the interfaces between the three equatorial ports devoted to the testing and the ITER machine and buildings. (author)

[en] Full text: Steady state solutions to the transport equations for stellarator plasmas in low collisional regime are derived and their stability is analyzed in terms of the purely neoclassical theory (without allowance for anomalous losses). It is shown that there exists a unique steady state continuous solution for the ambipolar electric field, i.e., in the case in question, the bifurcation of plasma states do not exist. (author)

[en] Full text: Numerical simulation of tokamak plasmas is very complex especially at the edge, where the gradients are steep and interaction with divertor and wall structure causes more complications. Simulations of various phenomena using five dimensional Monte Carlo guiding centre orbit following code ASCOT, which simulates neoclassical physics, and its gyrokinetic upgrade ELMFIRE, which takes into account also electrostatic turbulence, are presented. (author)

[en] Full text: The Hasegawa-Mima equation is the simplest nonlinear single-field model equation that captures the essence of drift wave dynamics, such as turbulent cascade and zonal flow generation. Like the Schroedinger equation it is first order in time, but its coefficients are real so if the potential phi is initially real it remains real. However, by embedding phi in the space of complex functions a simple Lagrangian is found from which the Hasegawa-Mima equation may be derived from Hamilton's Principle. (author)

[en] Full text: Zonal flows, by which we mean azimuthally symmetric bend-like shear flows, are ubiquitous phenomena in nature and the laboratory. It is now widely recognized that zonal flows are a key constituent in virtually all cases and regimes of drift wave turbulence, indeed, so much so that this classic problem is now frequently referred to as 'drift wave-zonal flow turbulence'. In this theory overview, we present new viewpoints and unifying concepts which facilitate understanding of zonal flow physics, via theory, computation and their confrontation with the results of laboratory experiment. Special emphasis is placed on identifying avenues for further progress. (author)

[en] Full text: One of the major goals of conceptual studies of inertial fusion energy (IFE) is a description of energy fluxes and transformations in working media lines and trains and at interface between components of the system. Among the key problems to be solved is a transfer of the fusion energy to the cooler. In this paper the concept of fast ignition heavy ion fusion (FIHIF) is discussed. New data on the reactor chamber design and its response to fusion energy release are presented. (author)

[en] Full text: Development of the fabrication technology for the cryogenically cooled fuel targets has been initiated as a part of the Fast Ignition Realization Experiment (FIREX) Project at the ILE, Osaka University in the way of bilateral collaboration between Osaka University and National Institute for Fusion Science (NIFS). The present status of the study will be reported. Low density foam shells with a conical light guide will be fueled through a narrow pipe and will be cooled down to the cryogenic temperature. New ultra-low-density (2 ∼ 3mg/cm³) foam materials have been developed with ∼ 100nm lamella structure, and is suitable for the cryogenic foam target to ignite in the FIREX project. (author)

[en] Full text: In this paper, we investigate dynamics of sawtooth oscillation and neoclassical tearing modes based on kinetic RMHD model to elucidate the mechanism of nonlinear excitation of them, putting an emphasis on interaction with microscopic and transport processes. Various routes of excitation of MHD modes by turbulence are demonstrated. It is shown that research on the hierarchical interaction between turbulence and MHD is important in Tokamak physics. (author)

[en] Full text: Fusion deployment scenarios have been developed for the last half of this century. These scenarios are analyzed to determine the material resources required, the waste produced, and the reduction in carbon dioxide relative to fossil power production. The material requirements for these scenarios are significant but should be within world production capability. The fusion goal is to produce only low level activated waste. The amounts produced should be manageable. The positive impact on carbon dioxide in the atmosphere does not reach significant levels until the beginning of the next century as a result of the slow response of the environment to carbon dioxide emissions due to the large reservoirs involved. (author)