Wednesday, February 13, 2019, 10:04

A previously coated tantalum tube with 3 layers of shielding (Details in e-log 426) was loaded with a graphite insert. 

The tube was loaded in evaporator 2 and pumped down

The graphite insert will be heated to 2000 C for 1 week

IGP1=1.37e-07 Torr

 Wednesday, February 13, 2019, 10:27

IGP1= 1.46e-07 Torr

Manual tapping to 40A on TGHT

TGHT 40.7A, 0.104V

Autoramp started at 1A/min up to 400 A

Good Vacuum = 3.00e-05, Bad Vacuum = 5.00e-05

 Thursday, February 14, 2019, 08:42

IGP1= 2.2e-07 Torr, T=1705 C, TGHT 401A, 6.7 V

Manually tapping to 2000 C (Slow ~1 A/min) in 5 A increments followed by waiting for equillibrium

Thursday, February 14, 2019, 10:54

IGP1 = 1.4e-06 Torr, T = 2003 C, TGHT 500A, 9.1 V

Waiting for equillibrium

manually tapped TGHT to 503A,  T = 2003 C

Will leave for 1 week

Wednesday, February 20, 2019, 08:44

 IGP1= 1.37e-07 Torr, T=1943 C, THGT= 503 A, 8.9 V

Ramp-down @ 2A/min

Wednesday, February 20, 2019, 14:02  

1 hour since TGHT = 0 A

Venting will proceed.