Methods and apparatus for spatial separation of AC and DC electr

Details Methods and apparatus for spatial separation of AC and DC electr Methods and apparatus for spatial separation of AC and DC electr

1974-08-30

1976-02-10

Church, Craig E.

Radiant energy

Ionic separation or analysis

Methods

250292, H01J 3934

Patent

active

039379540

ABSTRACT:
Methods and apparatus for spatially separating AC and DC electric fringe fields near the ends of quadrupole mass filters which involve use of materials with electric properties that function as dielectrics to the AC fields and as conductors to the DC fields. Devices constructed of such materials shield against DC fringe fields, but not against AC fringe fields. Such devices include a small shield in the form of a tube or other appropriate configuration disposed coaxially with the axis of the mass filter at either or both ends thereof. A good dielectric is used as the supporting structure and a thin conductive or semi-conductive layer is applied thereto which functions as the shield.

REFERENCES:
patent: 3129327 (1964-04-01), Brubaker
patent: 3350559 (1967-10-01), Young
patent: 3501630 (1970-04-01), Brubaker
patent: 3617736 (1971-11-01), Barnett
patent: 3783279 (1974-01-01), Brubaker
patent: 3867632 (1975-02-01), Fite

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