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<p class="MsoNormal"><span style="color:#1F497D">Dear Piotr<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Nadav<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D">Nadav Elad, Ph.D.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D">Electron Microscopy Unit</span><span lang="HE" dir="RTL" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;color:#1F497D">Weizmann Institute of Science</span><span dir="RTL"></span><span dir="RTL" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><span dir="RTL"></span>
<span lang="HE"><br>
</span></span><span lang="HE" dir="RTL" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><a href="mailto:nadav.elad@weizmann.ac.il"><span lang="EN-US" dir="LTR" style="font-family:"Calibri",sans-serif;color:#0563C1">nadav.elad@weizmann.ac.il</span></a></span><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D"><a href="https://urldefense.com/v3/__http://www.weizmann.ac.il/Chemical_Research_Support/EM_Unit/Nadav/__;!!Mih3wA!AB_nEtqVb25XnQPOBaUEAC7YO9bFOTDp0eWBxLFmHoC1rdUZw-j1xq65rF-qunoYEaINUYHjAliOSqgM9FvE-aUKpGfF$"><span style="color:#0563C1">Personal website</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b>From:</b> Piotr Szwedziak <<a href="mailto:piotr.szwedziak@zmb.uzh.ch">piotr.szwedziak@zmb.uzh.ch</a>><br>
<b>Date:</b> 13 February 2024 at 11:53:24 GMT+2<br>
<b>To:</b> <a href="mailto:3dem@ncmir.ucsd.edu">3dem@ncmir.ucsd.edu</a><br>
<b>Subject:</b> <b>[3dem] Beam drift - Glacios G2</b><o:p></o:p></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt;font-family:"Times New Roman",serif">
<o:p></o:p></span></p>
<p class="MsoNormal">Dear All,<o:p></o:p></p>
<p class="MsoNormal">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:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>switching on/off active electromagnetic field cancellation system doesn’t make a difference to the beam stability<o:p></o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>opening/closing the microscope enclosure, disturbing the electromagnetic field intentionally doesn’t make a difference to the beam stability<o:p></o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>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
<o:p></o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>the drift we observe on the Glacios G2 is particularly severe after changing microscope magnification/switching to diffraction<o:p></o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>the beam drift is unidirectional rather than in random orientations<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Therefore we believe the issue of the unstable beam is system- rather than environment-related. Has anyone experienced similar problems?
<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Best and many thanks,<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Piotr <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">-- <br>
Piotr Szwedziak, PhD <br>
Center for Microscopy and Image Analysis <br>
University of Zurich <br>
Winterthurerstrasse 190 <br>
CH-8057 Zurich <br>
Switzerland <br>
<br>
</span><span lang="DE-CH" style="mso-fareast-language:EN-GB"><a href="https://urldefense.com/v3/__https:/www.zmb.uzh.ch__;!!Mih3wA!BgqpzTo-2WBAwsfCCK3jlKhiuaqeltrSgddXo-y0pzPcd8ipwK2HMEs0Sv7BLcvO-_CHP6izkwjHFdcKl7GmEPqnQqvGMnN54g$"><span lang="EN-GB">https://www.zmb.uzh.ch</span></a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">_______________________________________________<br>
3dem mailing list<br>
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<a href="https://mail.ncmir.ucsd.edu/mailman/listinfo/3dem">https://mail.ncmir.ucsd.edu/mailman/listinfo/3dem</a><o:p></o:p></span></p>
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