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Variable Aperture for Controlling Ion Beam Current

IP.com Disclosure Number: IPCOM000075819D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Hammer, WN: AUTHOR [+2]

Abstract

In ion accelerator work a means for controlling ion-beam current without having to change the ion source parameters is desirable. This aperture consists of a tube 10 of stainless steel with two square holes cut in opposite sides of the tube. These holes have their K and Y axis offset at 45 degrees, so that the square holes are parallel to the normal plane to the tube. This affords some degree of collimation.

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Variable Aperture for Controlling Ion Beam Current

In ion accelerator work a means for controlling ion-beam current without having to change the ion source parameters is desirable. This aperture consists of a tube 10 of stainless steel with two square holes cut in opposite sides of the tube. These holes have their K and Y axis offset at 45 degrees, so that the square holes are parallel to the normal plane to the tube. This affords some degree of collimation.

As the shaft attached to the tube is rotated, the size of the beam passed through the square apertures changes, the shape and center of the beam being maintained. This is illustrated in Figs. 2A-2C where the tube 10 is rotated to change the through-put of the square aperture system.

In a particular case, a suitable aperture was made with 3/4 inch stainless steel tubing where the square holes were 1/4 inch. The axes of the square holes were arranged at 45 degrees.

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