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Pub. No.:    WO/2018/138814    International Application No.:    PCT/JP2017/002598
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Thu Jan 26 00:59:59 CET 2017
IPC: H01J 49/40
H01J 49/02
Inventors: SAKAGOSHI, Yusuke
坂越 祐介
The present invention provides a mass spectrometer (TOFMS) equipped with measures for preventing a drop in accuracy which arises during transportation to an installation site. The invention is a TOFMS wherein mass separation is performed based on the time-of-flight of an ion flying through a flight space, and comprises: an ion transport section (12, 14, 15) for transporting ions; an acceleration section (push-out electrode (161), and the like) whereby the transported ions are received, and the ions are accelerated so as to be introduced into the flight space; a flight section having therein the flight space; a first vacuum container (18A) surrounding the ion transport section, the acceleration section, and at least a portion of the flight section; a chassis (19) whereon the first vacuum container (18A) has been placed; and a reflection section unit (20) having fixed therein a reflection section (reflectron 164) for inverting the flight trajectory of the ions that have been accelerated and introduced into the flight space by the acceleration unit, and a second vacuum container (28) surrounding the reflection section and mountable at an end of the first vacuum container (18A). Since the reflection section unit (20) can be separated from other sections during transportation, the other sections can be moved readily for instance with casters (191) provided on the chassis (19), allowing the reflection section unit (20) to be moved without being impacted by the vibrations caused when moving with the casters (191).