Vacuum vessel supporting devices

Purpose: To support a vacuum vessel in a stabilized state without enlarging support arms or decreasing the number of observing ports. Constitution: Upper and lower observing ports have a structure of a great longitudinal rigidity, directly coupled at the inner top ends thereof to the positions near the gravitational center of the vacuum vessel and connected at the outer top ends thereof to instrumentations or the likes by way of bellows. To the upper and lower racks, are attached dampers respectively which support the outer ends of the measuring ports. In such a constitution, since vibrations exerted on the vacuum vessel can be received at the observing ports and decayed through the dampers, abnormal vibrations in the vacuum vessel can be prevented. (Kawakami, Y.)