NANOSYSTEM
FABRICATION
FACILITY
(NFF),
HKUST
Version
1.0
Page 16 of 18
NFF Machine Reservation System. Place sign “EMPTY” on the machine.
4.12
Pump down and shutdown
1. When finish samples unloading, close the chamber door and it will
automatically start to pump down.
2.
DON’T GO AWAY YET!
3. Monitor the pump down to be sure the chamber door was correctly closed:
a. Verify that the roughing pump and roughing valve turn on within
10-20 seconds.
b. Wait for the pressure to drop to the crossover pressure, i.e. for the
cryopump to take over at about 150 mTorr. This will take 5 minutes.
4.
RECORD RESULTS
in the logbook.
5. Be sure the crossover pressure is met and that the cryopump valve opened.
6. Clean up the area and return items to their proper locations.
7. Place an
EMPTY
sign on the machine.
8. Write down any problems or comments in the logbook.