[3dem] Objective Astigmatism Stability

[Sacha De Carlo]

If you observed the astigmatism change that fast, you may want to monitor
the obj. lens temperature and check that your cooling water flow is
consistent with the pre-install manual and the flow is constant.
Else, you may want to check for EMS interferences.

Best,
Sacha


On Tue, Aug 20, 2019 at 11:43 AM Farzad <farzaad at gmail.com> wrote:

> Dear All,
>
> Anybody has any experience in measuring the stability of objective
> astigmatism in FEI F20 FEG columns (Tecnai, Talos or Glacios)? How much let
> say "astigmatism drift" is normal if we do not change anything and come
> back to the instrument after 15 minutes. I mean just imagin after
> correcting it on a carbon film area and check it on a same region and same
> optical set-up after a certain time?
>
> the sample is normal carbon grid, no magnetic or loos particles there, and
> also there is no major sample drift.
>
> Regards
>
> Farzad
>
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