Monday, July 20, 2020, 19:27 

Coated Ta tube cotaining 355 SiC disks wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

 Monday, July 20, 2020, 23:06

IPG1 = 3.1e-06 Torr

Start autoramp at .25A/min to 40A for both TGHT and TBHT

Tuesday, July 21, 2020, 08:06

TGHT = 40.3 A, 0.51 V

TBHT = 39.0 A, 0.46 V

increase auto ramp limit to 50 A for both TGHT and TBHT 

IGP1=1.8e-05 Torr

Tuesday, July 21, 2020, 16:22

IGP1= 1.5 e-05 Torr 

TGHT = 50.1 A, 0.65 V

TBHT = 50.0 A, 0.60 V

 Change ramp target to 350 A for TGHT and 230A for TBHT

Wednesday, July 22, 2020, 13:24

Stopped autoramp.  Will allow pressure to drop. 

TGHT = 64.0 A, 0.86 V

TBHT = 64.5 A, 0.82 V 

Thursday, July 23, 2020, 23:55

TGHT Reached 430 A,  7.7 V

OMEGA reads 1310 C but reading is not considered accurate so will leave at this current for 4 hours.

Friday, July 24, 2020, 11:31

IGP1 = 1.98e-07 Torr

Window for pyrometer was coated with condensate.  

Dismounted target and cleaned two windows in line with the pyrometer.