noun
secondary electron multiplier
Technical term used in physics and electronics for a device that amplifies electron signals via secondary emission.
二次電子増倍管は質量分析計に使われる。
A secondary electron multiplier is used in mass spectrometers.
Compound of 二次 (secondary), 電子 (electron), and 増倍管 (multiplier tube). The term is a direct technical calque from English.