Gun tilt : Purpose: The gun tilt makes sure that the electron beam from the gun comes down parallel to the optical axis, so that no electrons from the beam are lost before they can be used for imaging, etc. Importance: ESSENTIAL for having sufficient beam intensity. Method: Obtain maximum intensity.
Gun tilt pivot point
Gun shift: Purpose: Shift the electron beam sideways so that it comes down along the optical axis. Importance: ESSENTIAL for minimizing movements between different spot sizes and for having the beam correctly along the optical axis for all spot sizes. Method: Minimize spot displacement when spot size (that is focal length of C1 lens) is changed.
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