Method and apparatus for trapping charged particles

Details Method and apparatus for trapping charged particles Method and apparatus for trapping charged particles

1992-03-05

1995-11-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Electric charging of objects or materials

361234, H01J 4934

Patent

active

054693233

ABSTRACT:
A method and apparatus for trapping charged particles employs at least one central electrode. An AC voltage and a DC voltage are superimposed and are applied to the central electrode resulting in an AC electric field having an intensity which declines with an increase in the distance from the central electrode, and a DC electric field which attracts charged particles forces toward the central electrodes. Charge particles are trapped in the space outside the central electrode by these fields. A wide trapping range in terms of mass and energy can be achieved with a high trapping density. The central electrode can consist of four element electrodes which are supplied with AC voltages superimposed on a DC bias voltage in such a manner that respective adjacent element electrodes are supplied with opposite phase AC voltages.

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