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Tuesday, May 23, 2017, 14:42
UO2/C green was prepared May 16th, 2017.
The cast peeled off the glass nicely May 17th, 2017.
Initial UO2 powder used = 50.25g (Inventory R-01032A, UO2 + bottle = 876.80g before use)
Graphite powder used = 10.32g
Green cast dried UO2/C + organic mass = 61.70g
The green was rolled up and wrapped in a piece of graphite sheet.
The Ta-target boat was wrapped with 1 long layer of heat shield and installed in evap1 today.
Chamber pumped down today.
Target boat will be ramped up to 520A at the rate of 0.1A/min.
Vacuum limit stop at 5.0e-5 Torr, backing off at 6.0e-5 Torr.
IG1 = 4.80e-6 Torr
Tapped up to 30A, 0.45V
Waited ~1hr, vacuum stable.
IG1 = 8.3e-6 Torr
Initiating auto-ramp
Wednesday, May 24, 2017, 09:26
IG1 = 5.5e-5 Torr
TGHT = 64A, 0.72V
Vacuum currently yo-yo-ing.
Changing vacuum limits to attempt to speed up process.
Vacuum limit stop at 1.0e-4 Torr, backing off at 5.0e-4 Torr.
Once vacuum settles and vacuum starts to drop will adjust limits again accordingly.
Wednesday, May 24, 2017, 11:17
IG1 = 1.2e-4 Torr
TGHT = 69A, 0.74V
TGHT direct readout = 66A, 0.73V
Thermometer attached to TP = 41.0C
Room temp = 24.0C
Wednesday, May 24, 2017, 13:16
Vacuum going well.
Stable yo-yo-ing at current vacuum limit.
TP = 41.5C, RT = 23.9C
IG1 = 1.2e-4 Torr
TGHT = 71A, 0.77V
Increasing vacuum limit stop to 2.0e-4 Torr.
Thursday, May 25, 2017, 13:03
Vacuum has stabilized.
TGHT = 188A, 1.85V
IG1 = 2.2e-5 Torr.
Adjusting vacuum limits so when 2nd phase starts, vacuum does not spike.
Vacuum limit stop at 5.0e-5 Torr, backing off at 1.0e-4 Torr.
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