Friday, June 26, 2019, 17:10
A 13 mm die was used to cut out discs from strips
The target consists of 264 discs of 10 cm in length - all single discs, no packs.
231 x UO2/C discs = 25.76 g
10 UO2 discs for measurements = 1.49 g
Graphite insert without caps= 17.44 g
The loaded insert is placed on target boat.
Boat previously coated with TaC and sintered.
Ta-target boat is wrapped with 3-layers (3 used) of heat shield and installed in evap1.
Chamber is pumping down.
Tuesday, July 30, 2019, 09:45
Pressure limits:
Good vacuum 1e-1 Torr
Bad vacuum 5e-1 Torr
Initial vacuum IGP1 = 5.94e-7 Torr
Current tapped manually to 85 A at 1A/s in 5 A blocks with a waiting period of 25 s between each increment.
Tuesday, July 30, 2019, 10:53
After 30 min, the pressure started stabilizing around 0.0013 g
The current rate was changed to 1 A/2min to 88 A
The current rate was changed to 1 A/min to 90 A
The current rate was changed to 1 A/30s to 100 A
The final pressure obtained was 0.0011 Torr
The current rate was changed to 2 A each 10 s to 170 A
The final pressure obtained was 0.04 Torr
The current rate was changed to 1 A each 10 s to 180 A
The final pressure obtained was 0.008 Torr
The current rate was changed to 2 A each 10 s to 200 A
The final pressure obtained was 0.002 Torr
The current rate was changed to 3.2 A each 10 s to 292 A
The final pressure was 0.001 Torr
The current was tapped manually to 400 A in intervals of 10 A at 1 A/s each 10 s
The autoramp was set to 1 A each 10 s to 450 A
Then the current was increased manually at 1 a each 20 s until 475 A
The current was increased in this manner until 480 A to make sure the pressure was not rising
Tuesday, July 30, 2019, 12:00
After the pressure stabilized and started reducing the current was reduced to 480 A
After 3 hours at 475 A the autoramp was set to -2A/min |