A compact and user-friendly ion irradiation system controlled remotely through the Internet was developed for the execution of collaboration experiments together with researchers at remote sites. Several hardware instruments and software programs were constructed and provided for the remote control of the system and for its connection to the Internet. Surface modification and analysis experiments with this system were remotely performed through the Internet. It was confirmed from the experiments that the present ion irradiation system was precisely controlled through the Internet and could be easily and safely used for the surface modification and analysis, that the normal communication speed of around 10 Mbps for the Internet was fast enough for the execution of such typical remote-controlled experiments, and also that an access to the system by a mobile phone was convenient and useful enough to check the condition of the system and experimental data.

Five alpha particle detectors based on a 4H semi-insulating SiC substrate wafer were made for the fusion diagnostics of the burning plasma. About 50 nm thick aluminum films were made as the ohmic-contact type electrodes on the 380 m thick substrate by an evaporation process. The characteristics of the detectors were examined by using a standard Am-241 alpha source. Each detector was irradiated with alpha particles and the electric charge induced in the detector was measured in the temperature range from room temperature up to 573 K. For all the detectors, the alpha particle detection signals were clearly observed with an oscilloscope at the bias-voltage higher than 500 volt. Two of the present detectors measured alpha particles with an energy resolution of about 25% at the temperature beyond 550 K and they are to be used for the measurement of escaping particles in plasma experiments.

No abstract

No abstract

No abstract