[3dem] icing with Gatan ELSA 698

[Reinhard Rachel]

Hi Tim, 
You also may check both O-rings on the holder. Second, did you do a leak-test
on the microscope, recently? It is good for checking the vacuum precisely. Did
you ever do this? And , on this particular TEM (we run a 2100F), we do a
weekend / 3 day Bakeout regularly, every few months (depending on workload in
particular with cryo transfer, and the whether conditions; this summer was
worse!). 
If needed get support from JEOL engineers … or contact me off-line.
Regards — Reinhard 

Von meinem iPhone gesendet

> Am 21.10.2022 um 09:57 schrieb SCHMUTZ Marc
<marc.schmutz at ics-cnrs.unistra.fr>:
> 
> Hi Tim,
> 
> 
> I fully agree with Marc and Michael and would add a small other point. 
> Check also the cryobox-cryoshields it can happen that for unknown 
> reasons the T° of it is not cold enough. (as the Elsa goes really down 
> it's perhaps the coolest place in your TEM and that's not good).
> 
> Good luck
> 
> 
> Marc
> 
> 
> PS On my first cryo TEM (CM12) in such a case I'd performed a bake out 
> of the column.
> 
>> Le 21/10/2022 à 00:25, Tim Gruene a écrit :
>> Hello erveryone,
>> 
>> our Gatan ELSA 698 holder produces ice such that we see the ice rings
>> in the ED diffraction pattern. The ice evaporates at -130C, but returns
>> as soon as we reduce the temperature again below about -140C.
>> 
>> This also occurs when we insert the holder at room temperature and only
>> cool it once fully inserted into the TEM (JEOL JEM2100Plus)
>> 
>> Would there be any ideas for the cause of this icing, and maybe even a
>> cure?
>> 
>> Thanks a lot!
>> Best regards,
>> Tim
>> 
>> 
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