[3dem] Beam drift - Glacios G2

[Nadav Elad]

Dear Piotr

We had a similar issue in our Talos Arctica. The beam drifted significantly to the same direction every time we switched from SA to LM and back to SA. It then gradually drifted back to its initial SA position and settled there. After many months of troubleshooting it turned out that when splitting the column (because of unrelated stage problems), the condenser module was tightened to the objective module in a slightly tilted orientation. Splitting the column again and tightening the screws around the column with the correct torque wrench finally fixed the problem.

Best
Nadav

--
Nadav Elad, Ph.D.
Electron Microscopy Unit
Weizmann Institute of Science
nadav.elad at weizmann.ac.il<mailto:nadav.elad at weizmann.ac.il>
Personal website<https://urldefense.com/v3/__http://www.weizmann.ac.il/Chemical_Research_Support/EM_Unit/Nadav/__;!!Mih3wA!AB_nEtqVb25XnQPOBaUEAC7YO9bFOTDp0eWBxLFmHoC1rdUZw-j1xq65rF-qunoYEaINUYHjAliOSqgM9FvE-aUKpGfF$ >



From: Piotr Szwedziak <piotr.szwedziak at zmb.uzh.ch<mailto:piotr.szwedziak at zmb.uzh.ch>>
Date: 13 February 2024 at 11:53:24 GMT+2
To: 3dem at ncmir.ucsd.edu<mailto:3dem at ncmir.ucsd.edu>
Subject: [3dem] Beam drift - Glacios G2

Dear All,
We have realised that the electron beam of our Glacios G2 (installed in December 2023) is not stable – for instance switching from imaging to diffraction and back causes the beam to return to a different position and continue drifting for several minutes. More background information:


1.      switching on/off active electromagnetic field cancellation system doesn’t make a difference to the beam stability

2.      opening/closing the microscope enclosure, disturbing the electromagnetic field intentionally doesn’t make a difference to the beam stability

3.      a lower end EM (Talos 120), which is next door and in similar electromagnetic field environment, has a very stable beam that doesn’t drift

4.      the drift we observe on the Glacios G2 is particularly severe after changing microscope magnification/switching to diffraction

5.      the beam drift is unidirectional rather than in random orientations
Therefore we believe the issue of the unstable beam is system- rather than environment-related. Has anyone experienced similar problems?
Best and many thanks,
Piotr




--
Piotr Szwedziak, PhD
Center for Microscopy and Image Analysis
University of Zurich
Winterthurerstrasse 190
CH-8057 Zurich
Switzerland

https://urldefense.com/v3/__https://www.zmb.uzh.ch__;!!Mih3wA!AB_nEtqVb25XnQPOBaUEAC7YO9bFOTDp0eWBxLFmHoC1rdUZw-j1xq65rF-qunoYEaINUYHjAliOSqgM9FvE-RRk51KD$ <https://urldefense.com/v3/__https:/www.zmb.uzh.ch__;!!Mih3wA!BgqpzTo-2WBAwsfCCK3jlKhiuaqeltrSgddXo-y0pzPcd8ipwK2HMEs0Sv7BLcvO-_CHP6izkwjHFdcKl7GmEPqnQqvGMnN54g$>

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