Friday, March 03, 2017, 08:53

UO2/C green was prepared Feb 28th, 2017.

The cast peeled off the glass nicely March 2nd, 2017 and loaded into evap1.

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

Initial UO2 powder used = 50.08g (Inventory R-01032A, UO2 + bottle = 977.24g before use)

Graphite powder used = 10.05g

Green cast dried UO2/C + organic mass = 63.21g 

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 and installed in evap1 today.

Chamber pumped down overnight.

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 = 3.2e-6 Torr

Tapped up to 35A, 0.40V

Waited ~5hrs, vacuum stable.

IG1 = 6.8e-6 Torr

Initiating auto-ramp

 Monday, March 06, 2017, 08:47

Evap1 tripped off fri night.

See attached screenshot of strip tool.

Had continued to ramp up and was at ~340A, but since the power supply had tripped off this was not actually being applied.

TGHT set back to zero, auto-ramp turned off.

Will investigate further before re-starting...

 Tuesday, March 07, 2017, 09:50

Have not figured out reasoning behind power trip.

According to controls, there were no power bumps at that time.

Water was still on - had not tripped off.

Tapped back up manually to 40A yesterday morning.

Remained at 40A overnight.

IG1 = 4.46e-6 Torr this morning.

TGHT = 40A, 0.38V

Re-initiated auto-ramp.

 Monday, March 13, 2017, 15:46 by AM

IG1 = 5.2E-5 Torr

TGHT= 436A 4.28V

Thursday, March 16, 2017, 08:37 by AM

TGHT reached 520A @ 5.37V this morning. Vacuum  at 6.2E-6 Torr

Friday, March 17, 2017, 08:21 by AM

520A @ 5.37V this morning. Vacuum  at 2.2E-6 Torr

Ramping down