Now we're running dry N2 into the LHe fill tube, recording the temperature rise of the C4 (LHe plate) sensor.
Events to look out for --
63K triple pt of N2
77K boiling pt of N2. Outgassing from getters?
log of temperatures during this warm up is kept here:
https://www.dropbox.com/s/5efk83sbckvpb7r/exes_warmup_cd018.dat?dl=0
At no point did the cube sensor pressure go above -0.04torr/ 0.00torr (flickered in between).
Plot of data so far looks like :
We think the N2 that we flowed into the neck froze in the He dewar. The first plateau from 70-240 minutes is probably due to the heat going into melting and boiling the frozen N2.
The second plateau after 300 minutes is probably due to running out of pressure from the LN2 storage dewar.
4 days sparse logging of temperatures. The Dropbox log file has notes on changes made to our procedure (heating the airflow with hot water bath/ electric heated, etc).
https://www.dropbox.com/s/5efk83sbckvpb7r/exes_warmup_cd018.dat?dl=0
At no point did the cube sensor pressure go above -0.04torr/ 0.00torr (flickered in between).
Plot of data so far looks like :
The second plateau after 300 minutes is probably due to running out of pressure from the LN2 storage dewar.
4 days sparse logging of temperatures. The Dropbox log file has notes on changes made to our procedure (heating the airflow with hot water bath/ electric heated, etc).
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