Maintenance for DR(Pandora)
Date:
Tuesday, January 15, 2013
Synopsis:
DR check after warm up
Equipment/Beam Line:
Description:
Backgroung
Pump IVC and OVC for 18 hours down to 3 x 10E-4 torr
Pumping only through the leak detector, no change in leak rate 0 x 10E-9 up to valves 25B and 25C
Open 25C: IVC leak rate 3 x 10E-8
Close 25C and Open 25B: OVC leak rate 2.6 x 10E-8
Capillary flow though
With 0.5 atm of He(4) on the still side the flow rate was about 8 mbar/min.
Capillary leak check
Equalize pressure on both sides of the capillary leak rate 3 x10E-8 no change after 4 min, 8 min and 1 hour
windows
IVC @ 1 torr of He(4) OVC @ 1E-3 Torr
Leak rate of the OVC was 2.8 x E-8, 3.5 x E -8 after 4 min and 4.1 x E -8 after 8 min.