Patent ID: 11923168
Assignee: FIBICS INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A method to compensate for 3 dimensional drift while controlling a charged particle beam (CPB) system having first and second charged particle beams each controllable in position, comprising:
positioning a sample supported by a stage in the CPB system;
identifying at least two reference fiducials of the sample;
determining a first drift compensation to compensate for a drift that causes an unintended change in first and second dimension positions of the first charged particle beam relative to the sample by a known amount over a period of time by monitoring one of the at least two reference fiducials;
determining a second drift compensation to compensate for a drift that causes an unintended change in a third dimension position of the second charged particle beam relative to the sample by a known amount over a period of time by monitoring the at least two reference fiducials before and after cross-sectioning the sample with the second charged particle beam, the third dimension being orthogonal to the first and second dimensions;
and
adjusting the position of the first charged particle beam by applying the determined first drift compensation and adjusting a rate of advancement of the second charged particle beam by applying the determined second drift compensation during an operation of the CPB system.