[en] Japan Power Engineering and Inspection Corporation (JAPEIC) is a statutory foundation charged with responsibility of enhancing thermal and nuclear power plant quality. JAPEIC performs construction and pre-service inspections as well as periodic inspections of many types of power plants including nuclear, gas turbine and internal combustion systems. In 1987 a research center was established to permit the systematic examination of advanced inspection technologies. One of the Structural Materials in Use for commercial Nuclear Power Plants provides the link to this workshop. The project is also referred to as the Aging General Evaluation (AGE) project. The AGE project is a six year, multi-task effort addressing material condition monitoring. One set of tasks emphasizes instrumentation simulation tasks to aid in application and utilization. All tasks are in their initial phases. The program is described in this paper

[en] The Plasma Research Center of the University of Tsukuba gives a historical review of mirror-related physics experiment projects including the GAMMA experiments. GAMMA-6, consisting of two minimum-B mirrors connected by a central-cell solenoid, is discussed and its plasma parameters are presented. Experiments of GAMMA-6 are divided into three categories: tandem mirror configuration, single minimum-B mirror, and technical developments. The GAMMA-10 project, a device used to study critical issues of physics on axisymmetrized tandem-mirror confinement, is discussed, and the magnet coils, injection system and axial distributions of magnetic field strength, electric potential, and plasma density are shown. The future directions of the GAMMA projects and tandem-mirror configurations are discussed

No abstract available

[en] It has been reported that galaxies in large regions (approx. 10(exp 2) Mpc), including some clusters of galaxies, may be streaming coherently with velocities up to 600 km/sec or more with respect to the rest frame determined by the microwave background radiation. On the other hand, it is suggested that the dominant mass component of the universe is dark matter. Because we can only speculate the motion of dark matter from the galaxy motions, much attention should be paid to the correlation of velocities between the observed galaxies and cold dark matter. So the authors investigated whether such coherent large-scale streaming velocities are due to dark matter or only to baryonic objects which may be formed by piling up of gases due to some explosive events. It seems that, although each galaxy will not follow the motion of dark matter, clusters of galaxies may represent the velocity field of dark matter. The origin of the velocity field of dark matter would be due to the initial adiabatic perturbations and, in fact, the observed peculiar velocities of clusters are within the allowed region constrained from the isotropy of the microwave background radiation

[en] This paper reports briefly on the symposium organized by the Plasma Research Center, University of Tsukuba, Ibaraki, Japan from 15 - 18 April 1980. The open plasma devices under investigation were devided into four general types: a) the electrostatic potential plugged mirrors; b) the radio-frequency (RF) - plugged mirrors and cusps; c) field-reversed mirrors and d) linear multiple mirrors

[en] Large-scale structures of the universe have been variously described as sheetlike, filamentary, cellular, bubbles or spongelike. Recently cosmic strings became one of viable candidates for a galaxy formation scenario, and some of the large-scale structures seem to be simply explained by the open cosmic strings. According to this scenario, sheets are wakes which are traces of moving open cosmic strings where dark matter and baryonic matter have accumulated. Filaments are intersections of such wakes and high density regions are places where three wakes intersect almost orthogonally. The wakes formed at t sub eq become the largest surface density among all wakes, where t sub eq is the epoch when matter density equals to radiation density. If we assume that there is one open cosmic string per each horizon, then it can be explained that the typical distances among wakes, filaments and clusters are also approx. 10(exp 2) Mpc. This model does not exclude a much more large scale structure. Open cosmic string may move even now and accumulate cold dark matter after its traces. However, the surface density is much smaller than the ones formed at t sub eq. From this model, it is expected that the typical high density region will have extended features such as six filaments and three sheets and be surrounded by eight empty regions (voids). Here, the authors are mainly concerned with such structures and have made numerical simulations for the formation of such large scale structures

[en] The IAEA Technical Committee Meeting on Mirror Fusion Research was held in Tsukuba, 8-12 July 1985. The topics discussed at the meeting included (1) present status of the world mirror programme, (2) potential formation and confinement, (3) RF applications to mirrors, (4) basic mirror experiments, (5) tandem mirror reactor studies, (6) mirror related work, and (7) theory. Several conclusions about mirror research were reached. Recent results demonstrate the thermal barrier potential, plugging at high density, empirical scalings of non-ambipolar transport, axial and radial transport, and the effects of RF heating. On the basis of the rapidly accumulating physics knowledge of open-system confinement, further improvement in the plasma parameters, up to a reactor-relevant level, is expected

[en] Public opinion in Japan as in many other countries in the world motivate deeper study and development of ISI techniques. Such a development has to involve also inspection of secondary side components due to a possible effect of secondary side break downs on the primary circuit. The Japanese development projects of ISI involve several aspects: (i) verification tests: (a) ISI reliability, (b) automatic inspection technology, and (c) advanced inspection technology; (ii) development programmes dealing with (a) crack initiation probability and (b) defect identification; (iii) development of advanced NDE technology. (orig.)

[en] In this paper, recent upgraded experimental results in GAMMA 10 have been reported along with the recent extensions of important scaling laws; the scalings of potential formation and of energy confinement for both ions and electrons. Radial transport processes have also been investigated. (author) 6 refs., 3 figs

[en] A survey is given of the experimental tandem mirror results obtained at the University of Tsukuba since 1978. The first tandem mirror, GAMMA 6, demonstrated the tandem mirror potential configuration and the validity of the Pastukhov confinement scaling law. GAMMA 10 demonstrated the plug/thermal-barrier potential distribution in axisymmetric end mirrors. The Pastukhov scaling for axial confinement was confirmed and improved radial confinement was observed, indicating the benefit of an axisymmetrized magnetic-field configuration. (author)