Fabrication of chopper for particle beam instrument
First Claim
1. A method for manufacturing a gating grid for a charged particle stream, the gating grid comprising a first and second set of electrically isolated, equally spaced wires that lie in the same plane, the respective sets of wires to be applied to alternate potentials, the method comprising the steps of:
- selecting an insulating substrate material to serve as a frame for a gating grid;
forming a gating grid attached to the substrate;
patterning a set of conductive portions on opposing sides of the grid, the conductive portions having a width such that they match a desired characteristic impedance of circuitry used to draw voltage to the grid.
2 Assignments
0 Petitions
Accused Products
Abstract
A technique for providing a grid for a gate such as utilized in gating a stream of ions or other particles in a spectrometer instrument. The grid of wires may, for example, be a so-called Bradbury-Nielson Gate that consists of a set of two electrically isolated sets of equally spaced wires that lie substantially in the same plane and alternate in potential. The method utilized to provide is to first fabricate a frame of an insulating substrate having a hole and depositing metal film patterns such that conductive portions are formed on either side of the hole. Conductive portions on either side form a series of terminating pads on the portion of the substrate closest to the hole and a bus bar. Grid wires are then formed by stretching a section of wire with desired constant tension across the hole and bonding the ends of the wire to a respective one of the pads on one side and bus bar on the other side. The method provides a rapid, inexpensive way to fabricate such modulating devices.
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Citations
12 Claims
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1. A method for manufacturing a gating grid for a charged particle stream, the gating grid comprising a first and second set of electrically isolated, equally spaced wires that lie in the same plane, the respective sets of wires to be applied to alternate potentials, the method comprising the steps of:
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selecting an insulating substrate material to serve as a frame for a gating grid; forming a gating grid attached to the substrate; patterning a set of conductive portions on opposing sides of the grid, the conductive portions having a width such that they match a desired characteristic impedance of circuitry used to draw voltage to the grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification