It is the task of the person on duty to check the NOTCam temperature
status and possibly fill NOTCam with LN2.
NOTCam should be filled every morning whenever it is mounted
on the telescope to make sure it stays at operating temperature.
The reason for filling in the morning rather than in the afternoon
is that if the temperature starts rising in the morning due to
spilling at night, NOTCam will have time to come back to operating
temperature before the next night starts.
During storage NOTCam is kept cold by the PTR and regular LN2
fillings (typically once per week or so). Email warnings will be sent
out to staff when the detector temperature reaches above -194 degrees.
Then it is time to fill it. This limit has been set very conservatively.
If the PTR works well, you have plenty of time before anything becomes
urgent, and you can typically wait until the next morning if the first
email comes in the early evening. NB! If the
PTR is not working, you should act quickly!
If you want to check the NOTCam temperatures more in detail, you
can check the
TMS monitoring on the web. You can also do
ssh -l obs marissa from any terminal using the usual
password. Check the temperature and pressure log file with the command
tail -f /home/software/notcam/NOTCAM_temp. Each five minutes
four different temperatures and the pressure is updated. The first
temperature is the cold table, the next is the outer vessel (typically
reflecting the dome temperature), the third is the center wheel section,
and the forth is the array temperature. The last value is the pressure
in mbar.
