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We evaluate the exposure during nadir observations with JEM-EUSO, the Extreme Universe Space Observatory, on-board the Japanese Experiment Module of the International Space Station. Designed as a mission to explore the extreme energy Universe from space, JEM-EUSO will monitor the Earth's nighttime atmosphere to record the ultraviolet light from tracks(More)
The earlier long-pulsed green laser annealing system had the big issue: a deep n-type layer, namely, a field stop (FS) layer in IGBT's structure was not sufficiently activated when thick wafers with large heat capacity were used. In order to cope with the big issue, we developed the thermal assist type annealing system in which a long-pulsed green laser(More)
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