🚀 go-pugleaf

>We are currently have severe icing problems with the MSC low temperature
>device.  We have sent the transfer tube back before and they repaired a
>weld and added a diffuser to the warm stream.  It seems that the ice is
>now forming internally and falling down on the crystal during the course
>of the run.  Usually within 24 hours, enough ice has fallen down and
>adhered to the crystal, that ice rings have formed on our images.  

I think it is unlikely that ice falling out of the transfer tube is the cause 
of the icing problem. It seems more likely that it is caused by turbulence. 
The flow rates may be too high, or the rates of the two streams may not be 
balanced. Unless the flow is laminar (or very nearly so) there will be icing 
and temperature instability at the crystal. It is also important that the 
distance from the nozzle to the crystal is not too great. Make the distance 
as short as possible without creating a blind zone on your detector. 

Perhaps there are better systems than the one from MSC, but that is not the 
most relevant question here. It may be more a question of selecting the best 
operating parameters for the instrument.

Hakon Hope