TEM Gun Alignments

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1) Iteratively use

  • beam shift
  • beam tilt
  • condensor astigmatism

To get a evenly distribute spot.

2) Use the 'holey cross' principle

  • Block the beam by inserting the 'Beam stop' into the projection chamber
  • Use gun shift to centre the cross
  • Use intensity to keep the beam on the beam stop.
  • Use condensor astigmatism


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