Abstract
A large area and high sensitivity particle detector using a channeltron type electron-multiplier is designed and fabricated. The detector has a large metallic surface area from which secondary electrons are emitted due to the incident particles. The characteristics of the detector are measured by an alkali ion beam. It is confirmed that the effective detection region is about 13 times larger than that of the entrance aperture of the channeltron. This detector has been installed in a time-of-flight type neutral particle analyzer and operated well in the measurement of the neutral flux emitted from the GAMMA 10 plasma.
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