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Monday, October 22, 2018, 17:55
UO2/C green was prepared , September 24, 2018
Initial UO2 powder used = 50.11 g (Inventory R-01032A, UO2 + bottle = 374.03 g before use)
Graphite powder used = 10.13 g
Green cast dried UO2/C + organic mass = 62.45 g
The green was rolled up and wrapped in a piece of graphite sheet.
The Ta-target boat was wrapped with 3-layers of heat shield [2 reused, 1 new] and installed in evap1.
Currently pumping down.
Tuesday, October 23, 2018, 15:38
IGP1 = 2.44e-6 Torr,
Tapped to 60 A at 10A/10s with 20 s waiting every 10 A,
Waited 28 min to vacuum to stabilize,
tapped to 80 A at 10A/10s with 20 s waiting every 10 A,
max pressure 7x10-3 Torr, waited 50 min to vacuum to drop
Tapped to 100 A at 10A/10s with 20 s waiting every 10 A,
max pressure 4x10-2 Torr, tapped current to 80 A,
The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off.
IGP1 = 1x10-4 Torr
Tapped back to 60 A at 10A/10s with 20 s waiting every 10 A,
waited 5 min to tap to 80 A at same rate
waited 5 min to tap to 100 A at same rate
waited 25 min to vacuum to drop from 2e-2 Torr to 8e-4Torr
Tapped to 110 A at same rate
waited 3 min to tap to 120 A at same rate
waited 1 min to tap to 130 A at same rate
waited 1 min to tap to 140 A at same rate
waited 15 min to pressure to drop from 6e-2 Torr to 7e-4 Torr
Changing manual rate to 10A/10s with waiting periods of 1 min, current was increased from 140 A to 260 A with this rate.
Changing manual rate to 20A/10s with waiting periods of 30 s, current was increased from 260 A to 480 A with this rate.
Waiting 4 min for the pressure to increase.
Changing the rate to 5A/30s, tapped until 510 A,
Changing the waiting period to 1 min, kept tapping to 530 A,
The pressure was dropping, when it was at 2x10-2 Torr, the current tripped off
The vacuum limit is 5e-1 Torr, and the pressure was dropping, there was no reason for the current to trip.
The pumps seems to be fine in the hot lab.
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