Tuesday, November 29, 2016, 16:13

UO2/C green was prepared Nov 23rd, 2016.

The cast peeled off the glass nicely Nov 24th, 2016 and finished drying over the weekend.

Some materials were stuck on the WC jar wall and balls, consistent with every time.

Initial UO2 powder used = 50.61g (Inventory R-01032A, UO2 + bottle = 1028.05g before use)

Graphite powder used = 10.16g

Green cast dried UO2/C + organic mass = 61.94g 

The green was rolled up and wrapped in a piece of graphite sheet.

A new Ta target boat is being used due to the previous one being old and is now very expanded.

The last round of flakes being carbonized [UC2flk_13] showed a slight change in current and power from previous carbonization process', also indicating the target boat should be retired.

The new boat has only been used once in evap1 to sinter some endcaps earlier in the year.

This target boat is slightly different than the old one because both ends are open, no endcaps are attached to the boat.

The Ta-target boat was wrapped with 3-layers of heat shield and installed in evap1 today.

Chamber is currently pumping down...

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.

Wednesday, November 30, 2016, 13:09

IG1 = 3.2e-6 Torr

Tapped up to 35A, 0.34V

Waited ~2hrs, vacuum stable.

IG1 = 8.7e-6 Torr

Initiating auto-ramp

 Monday, December 12, 2016, 09:15

Vacuum stable - carbonization process complete.

Evap1 remained at max setpoints over wknd

IG1 = 1.47e-6 Torr

TGHT = 520A, 5.12V

Initiating auto-cool at 1.0A/min

 Tuesday, December 13, 2016, 16:30

Vented in Ar and opened up evap1 today.

As previously mentioned this new target boat has no endcaps and one can see in the photo more materials have dispersed onto the sides of evap1

These materials appear to be mostly graphite since there are no visible holes through the graphite wrapping that surrounds the UC2 flakes.

Stored in glove box.