[en] In the conventional method of controlling waste containers by labels attached thereto, the data relevant to wastes contained in the waste containers are limited. Further, if the label should be peeled off, there is a possibility that the wastes therein can no more be identified. Then, in the present invention, an identification plate is previously attached, to which mechanically readable codes or visually readable letters or numerical figures are written. Then, the identification codes can be read in a remote control manner at high speed and high reliability and the waste containers can be managed only by the identification codes of the containers. Further, the identification codes on the container are made so as to be free from aging degradation, thereby enabling to manage waste containers for long time storage. With such a constitution, since data can be inputted from an input terminal and a great amount of data such as concerning the source of wastes can be managed collectively on a software, the data can be managed easily. (T.M.)

[en] Self-consistent Vlasov-Poisson simulations of beams with high space-charge intensity often require specification of initial phase-space distributions that reflect properties of a beam that is well adapted to the transport channel--both in terms of low-order rms (envelope) properties as well as the higher-order phase-space structure. Here, we first review broad classes of kinetic distributions commonly in use as initial Vlasov distributions in simulations of unbunched or weakly bunched beams with intense space-charge fields including: the Kapchinskij-Vladimirskij (KV) equilibrium, continuous-focusing equilibria with specific detailed examples, and various non-equilibrium distributions, such as the semi-Gaussian distribution and distributions formed from specified functions of linear-field Courant-Snyder invariants. Important practical details necessary to specify these distributions in terms of usual accelerator inputs are presented in a unified format. Building on this presentation, a new class of approximate initial kinetic distributions are constructed using transformations that preserve linear-focusing single-particle Courant-Snyder invariants to map initial continuous-focusing equilibrium distributions to a form more appropriate for non-continuous focusing channels. Self-consistent particle-in-cell simulations are employed to show that the approximate initial distributions generated in this manner are better adapted to the focusing channels for beams with high space-charge intensity. This improved capability enables simulation applications that more precisely probe intrinsic stability properties and machine performance

[en] Moving beam technique in performing total body irradiation (TBI), which sweeps the X-ray beam completely over the whole body axis, is a useful technique for small treatment room in our hospital. However, homogenous dose distributions for patients cannot be obtained without changing the output during gantry rotation. We developed a method for obtaining a homogenous dose distribution by changing the software of the control unit of the linac without any change in the construction of the machine. The change of output/degree and/or the field width at each gantry angle can be automatically calculated by our method, the result, homogenous dose of ±3% at the reference plane was obtained in treating a useful length of 200 cm. From this study, though the results are still preliminary, our method might be promising in performing TBI. (author)

[en] The scanning beam riometer at Syowa station, Antarctica (66.1deg inv. lat.), detects north-south (N-S) and east-west (E-W) movement of auroral absorptions with a time resolution of 10 sec and spatial resolution of 10 km at the ionospheric height. It is shown that auroral absorptions drift eastward in the post-midnight to pre-noon sectors, and drift westward in the noon to pre-midnight sectors, with speeds ranging from 60 to 700 m/s. The E-W drift direction is reversed around the 10 MLT sector where the drift direction is poleward. The E-W drift direction is also reversed in the pre-midnight sector where the drift is equatorward. This local time dependence of the absorption drift coincides with the ionospheric projection of the magnetospheric convection deduced from IS radar and balloon observations. The fact that the eastward (westward) drift corresponds to the negative (positive) geomagnetic H deflection with respect to the quiettime level strongly suggests that the magnetospheric source region for the energetic electron precipitation drifts due to the E x B drift. It is inferred that the auroral absorption is spatially elongated in the form of a belt. The width of a typical absorption belt ranges from 30 to 60 km. The observed belt-shaped auroral absorption suggests an existence of a sheet-like structure of magnetospheric plasma, where the pitch angle diffusion causes the precipitation of energetic electrons responsible for the auroral absorption. (author)

[en] The present invention provides a method of and a device for automatically identifying fuel numbers impressed on fuel assemblies disposed in a fuel reprocessing facility, power plant and a reactor core at a high speed and at a high identification rate. Namely, three or more character images are photographed for one fuel assembly as an object of the identification under different illumination conditions. As a result, different character images by the number of the illumination directions can be obtained for identical impressed characters. Learning on a neural network system is applied to the images of all of the characters impressed on the fuel assembly obtained under illumination of predetermined directions. Then, result of the identification by the number of the illumination directions can be obtained for each of the characters as an object of the identification. As a result, since the result of the identification is determined based on a theory of decision of majority, highly automatic identification can be realized. (I.S.)

[en] We herein propose a fuel pellet with a flower-shaped tamper and an ablator layer filled with a heavier material as a heavy-ion inertial fusion target. The proposed fuel pellet structure successfully mitigates the non-uniformity of energy deposition owing to the different penetration depths at different parts of the incident heavy-ion beams. The heavier material in the ablator interferes with the movement of the ablator material. The low-density region in the ablator layer at the edge of the irradiated area is mitigated, and direct heating of the fuel by heavy-ion beams is prevented. (author)

[en] A pulsed-power generator with high current rise based on a pulse-forming-network was studied toward generating intense point-spot X-ray source. To obtain the high rate of current rise, we have designed the compact discharge device with low circuit inductance. The results indicate that the inductance of the compact discharge device was dominated by a gap switch inductance. To reduce the gap switch inductance and operation voltage, the feasible gap switch inductance in the vacuum chamber has been estimated by the circuit simulation. The gap switch inductance can be reduced by the lower pressure operation. It means that the designed discharge device achieves the rate of current rise of 10¹² A/s

[en] VLF radio waves passing through polar caps and auroral zones are subjected to disturbances in phase and electric field intensity because of the abnormal ionization of lower ionosphere due to solar cosmic radiation, etc.. While HF radio waves are easily absorbed, VLF radio waves can monitor the disturbance as phase fluctuation in spite of varying electric field intensity. Remarkable phase advance was seen in NAA-17.8 kHz passing through polar caps and ALDRA-13.6 kHz and GBR-16.0 kHz through high-latitude auroral zones at the time of the solar-cap disturbance due to proton-flare solar radiation. (Mori, K.)

[en] Kinetic energy partitioning between longitudinal and transverse directions of beam bunch was studied for longitudinal pulse compression during final stage of energy driver in heavy-ion inertial fusion. Beam parameters were corresponded with experimental parameters of compact electron beam simulator. The kinetic energy equipartition was estimated by the multi-particle simulation results. It was expected that the equipartition in a theoretical approach is underestimated in comparison to the numerical simulation result. (author)

[en] The lens of the eye is one of the radiosensitive critical organs. We must set up the radiation treatment planning to protect it as little as possible in the reduction of the dosage of the eye, not only benign tumor but also malignant tumor. In our study, we have evaluated the technique of the radiation in the shallow lesion tumor around the lens, such as conjunctival tumor. We can reduce the dosage of the lens and cornea 100% to less than 10% using with 2 mm lead shield in thick in the treatment 6 MeV electron beam. We found this technique is very useful and effective in clinical radiation treatment planning. (author)