Monday, October 25, 2021, 11:52

Ta IGLIS tube was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature = 1900 C (expected TGHT ~430 A), TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

Good vacuum = 3.00 e-3 Torr

Bad vacuum = 5.00 e-2 Torr

Initial total weight = 439.0 g

Final weight after sintering = 438.8 g

Tuesday, October 26, 2021, 07:18 

IGP1= 9.2 e-07 Torr

Will ramp to 50A at 1A/min on both TGHT and TBHT.

Tuesday, October 26, 2021, 08:37 

IGP1= 3.0 e-05 Torr

TGHT= 50.2 A, 0.6 V

TBHT = 49.4 A, 0.5 V

Will allow pressure to drop further then start further ramp up

Tuesday, October 26, 2021, 14:36

TGHT =  100 A, 1.3 V

TBHT = 99 A, 1.0 V

IGP1 = 3.e-5 Torr

ramp up TGHT to 400 A and TBHT to 230 A at 1.5 A/ min

Tuesday, October 26, 2021, 18:46 

 Will keep at 430A on TGHT and 230A on TBHT for 4 hours.

OMEGA reading = 1653  C is suspicious based on previous coating.  

Tuesday, October 26, 2021, 23:05

TGHT = 430.5 A, 6.9 V

TBHT = 232.09A, 2.8 V

IGP1= 8.8e-06 Torr

Start cooling THGT at -2A/min and TBHT at -1A/min