Method and apparatus for spatial separation of ac and dc...

Details Method and apparatus for spatial separation of ac and dc... Method and apparatus for spatial separation of ac and dc...

G - Physics

21

K

358/9

G21K 1/08 (2006.01) H01J 49/42 (2006.01)

Patent

CA 1046169

Abstract of the Disclosure 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 mate- rials 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.

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