Laura Lambert wrote:

Laura Lambert wrote: Laura Lambert wrote:  Thursday, December 07, 2017, 09:57 Each endcap is wrapped in a separate piece of graphite foil and placed in a target boat. There are also 4 coated springs, 2 on each side of the stack of endcaps. The boat is wrapped with 3-layers of Ta heatshields. Chamber pumped down overnight. OMEGA slope = 0.98 HS water valves opened, no leaks detected. IGP1 = 5.9e-7 Torr IGP2 = 4.0e-7 Torr Tapping up manually. Final desired temperature = 1800C    Thursday, December 07, 2017, 11:51 TGHT tripped off. Turns out the vacuum limits have not been fully updated when they should have been and the old ones still apply. IGP1 reached 8e-5 Torr which tripped off the system. TGHT = 80A, 1.05V when the system tripped.    Friday, December 08, 2017, 15:29 Interlocks have been updated. TGHT should now run up to 500mTorr before tripping off.

Friday, December 08, 2017, 15:41

IGP1 = 2.8e-7 Torr

IGP2 = 1.9e-7 Torr

Tapped up manually to 50A

Initiated auto-ramp at a rate of 0.2A/min up to 300A.

Vacuum limit stop at 3.0e-5 Torr, backing off at 4.0e-5 Torr.

 Monday, December 11, 2017, 09:37

IGP1 = 2.4e-7

TGHT = 300A, 4.80V

OMEGA = 1175C

Tapping up manually...

 Monday, December 11, 2017, 14:19

Tapped up manually to 1800C

IGP1 = 2.1e-6 Torr

IGP2 = 2.1e-6 Torr

TGHT = 545A, 9.90V

OMEGA = 1810C

Will remain at max setpoints overnight and cool down in the a.m.

 Tuesday, December 12, 2017, 09:01

TGHT = 545A, 9.96V

OMEGA = 1833C

Remained at max setpoints for ~18hrs

IGP1 = 4.2e-7 Torr

IGP2 = 3.9e-7 Torr

Initiating auto-cool at 2.0A/min

 Wednesday, December 13, 2017, 11:05

Vented in air and removed from evap2 this morning.