Design and Fabrication of Quadrupole Ion Mass Spectrometer for Upper Atmosphere.
Scientific rept. no. 1. 1 Oct 77-30 Sept 78,
WENTWORTH INST BOSTON MASS
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The cluster ion mass spectrometer consists of a two piece cone section with the top cone section electrically biased with respect to the lower cone. The front cone has an orifice opening of .03-.04 in. diameter for ion sampling. The cone assembly was attached to a liquid helium cooled cryo pump supplied by another contractor. Attached to the bottom side of the liquid helium cryo pump is the base plate, O rings provided the vacuum seal between the base plate and cryo pump. Rod housing was fixed to the base plate and extended upward through the pump section. A RF quadrupole assembly extended to the upper region of the front cone sampling area and downward to an ion detecting electronic multiplier. An aluminum ring was externally attached to the base plate to support the electronics section of the instrument. This section consisted of a series of leg supports to which was attached a deck plate to hold an electronics oscillator box and an assortment of other housekeeping equipment. Below this deck and mechanically to it is a complex cast aluminum housing of electronic equipment. This entire section was enclosed with a vacuum tight electronic cover can.
- Atmospheric Physics
- Test Facilities, Equipment and Methods