[en] A pneumatic gun type pellet injector for the JFT-2M has been developed. The results of experiments which were carried out to explore the possibilities of fueling by pellets and of improving plasma parameters are presented. It was found that pellet velocity does not change in neutral beam-heated plasmas, metal and light impurities do not increase with pellet injection and electron temperature and beta recover in 30-40 ms

[en] The paper contains a summary of Japanese BWR utilities and vendors' joint studies on loss of coolant/ECCS phenomena including separate effects and integral system testing. The development, improvement, qualification, and advantages of use of the SAFER-03 computer code is discussed. The SAFER-03 code is being reviewed by the Japanese regulatory body for licensing

[en] Low-temperature transport properties in a ferromagnetic Fe₁₉Ni₈₁ nanoring were studied. In the nanoring, resistance oscillation due to the Aharonov-Bohm effect of a conduction electron was observed. However, the reproducibility of resistance with magnetic field, which is usually observed in non-magnetic metals, was not observed. This result suggests that some kinds of degrees of freedom, which persist even at low temperature break in part the reproducibility of the aperiodic fluctuation in magnetoresistance

[en] Galvanomagnetic effect of NiFe rings has been studied. It was found that the ring takes two kinds of magnetization state, closure domain state and bi-domain state. At very low temperatures, resistance oscillation and fluctuation were observed, indicating the existence of the quantum interference effects such as Aharanov-Bohm effect

[en] Several spectral lines produced by charge transfer of O⁸⁺ with atomic hydrogen from neutral heating beams have been observed in the ISX-B tokamak. These signals have been utilized to measure the concentrations of fully stripped oxygen. (Auth.)

[en] The main objective of a pellet injection in JFT-2M is to improve the plasma March parameters, i.e. to achieve high confinement, high density and high beta plasmas. Neutral beam (NB) or ion cyclotron range of frequency wave (ICRF) heated JFT-2M discharges with gas fueling exhibit H-modes in divertor or limiter configuration. Deuterium pellets (speed: 0.7-1 km/s) were injected in the L- or H-mode phase of divertor discharges. A very high confinement mode was achieved as the large pellet Δn-tilde_e ≅ 3-4.5x10¹⁹m^-3) was injected in the L-mode phase. The maximum global energy confinement time (τ_E=W₈/(P_t-dW₈/dt)) is 60-75 ms in NB heating and 55-60 ms in ICRF heating, which exceed τ_E in gas fueled H-mode by a factor of 1.4-1.7. In ICRF heating, τ_E was also improved as the pellet was injected in the H-mode phase. In this case, pellet penetration depth is the same as that of injection in the L-mode of NB heating. With a small pellet (Δn-tilde_e <= 1.5x10¹⁹m^-3), large improvement of τ_E has not been obtained. High density plasmas were easily obtained by injection of 4 pellets with time interval of 30-50 ms. Maximum line-averaged electron density was 8x10¹⁹m^-3 (Δn-tilde_e ≅ 5x10¹⁹m^-3) in Ohmic heated discharges (6x10¹⁹m^-3 for gas fueling) and 9.5x10¹⁹m^-3 (Δn-tilde_e ≅ 7x10¹⁹m^-3, Murakami factor ≅ 9.7) in NB heated discharges. These results indicate that pellet injection is useful to improve the plasma parameters. (author). 6 refs, 7 figs

[en] The Next-Generation Light Water Reactor development program was launched in Japan in April 2008. The primary objective of the program is to cope with the need to replace existing nuclear power plants in Japan after 2030. The reactors to be developed are also expected to be a global standard design. Several innovative features are envisioned, including a reactor core system with uranium enrichment above 5%, a seismic isolation system, the use of long-life materials and innovative water chemistry, innovative construction techniques, safety systems with the best mix of passive and active concepts, and innovative digital technologies to further enhance reactor safety, reliability, economics, etc. In the first 3 years, a plant design concept with these innovative features is established and the effectiveness of the program is reevaluated. The major part of the program will be completed in 2015. (author)

[en] Recent theoretical calculations indicate that co-injection of neutral beams can inhibit impurity accumulation, but counter-injection can enhance accumulation. (orig./AH)

[en] Cryogenic targets (H₂, D₂ and ⁴He) have been built for use in the study of photonuclear reactions with π sr spectrometer, TAGX at the 1.3 GeV Tokyo electron synchrotron. A new type of vacuum jacket fabricated from plastic honeycomb core and Mylar skins has been used in the target system for more than 5000 hours. The average radiation thickness and the average density of this jacket are measured to be 3.3 x 10^-3 X₀ and 0.15 g/cm³, respectively. (author)

[en] Electric resistance measurements down to 20 mK were performed for Ni wires 20 nm in width, 20 nm in thickness and 20 μm in length. An increase of resistance proportional to T^-1/2 was observed in a wide temperature range from 10 K to 80 mK, which is interpreted by the electron-electron interaction effect