Before Operation

1) Check the Logbook to see if there are any problems encountered by the previous users.
See which W atom is used for the alignment in the previous session.

2) Check the (i) temperature and the (ii) pressure of the system.

The temperature is 93 Kelvin, i.e., the reference has changed due to the temperature gradient.
If the temperature is 98 Kelvin, we need to refill Liquid N2, either automatically or manually.
The liquid nitrogen is filled at 08:00 and 20:00. You can see the time remaining for the next fill-up.
If it is only 1 hour left, we cannot use HIM because the source is unstable.
You can postpone the fill time or can click “Fill Now”.
Note: Due to temperature disturbance, it needs 40 min to stabilize.

Pressure: Vacuum DashBoard:
the vacuum level of GFIS should be E-10 Torr.
the vacuum level of the chamber should be E-8 Torr.
the vacuum level of the load lock should be E-2 Torr.
Note: the vacuum has to be low otherwise the arc will destroy the tips.