Tuesday, June 14, 2022, 08:47

Ta HP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (3 layers)

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

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 3.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @2A/min to 80 A then autoramp heat @1A/min to 150 A.  Then autoramp TGHT to 675A and TBHT to 230A.

Tuesday, June 14, 2022, 08:49

IGP1= 0.13 Torr

*had timed out and it was off.  I RST and turned back on.*

Will wait for the pressure to drop to start heating

 Tuesday, June 14, 2022, 09:36

IGP1= 9.4e-06 Torr

Start autoramp @2A/min to 80A

Tuesday, June 14, 2022, 11:27

IGP1= 8.7 e-06 Torr Trending down. 

TGHT= 146A, 1.6V

TBHT= 146A, 1.7V

Has been ramping at 1A/min

Change ramp rate to 2A/min to 700A on TGHT and 230A on TBHT

Tuesday, June 14, 2022, 14:48

Change final current on TGHT to 675A, according to plot.  May change again. 

Currently TGHT=  537A, 7.7V 

IGP1= 4.4e-06 Torr

Tuesday, June 14, 2022, 18:46

Top temperature was 1825 Celsius at TGHT = 675A

Will start rampdown at 8:00 pm

 Tuesday, June 14, 2022, 20:01

TGHT= 675A, 10.3 V

TBHT= 230A, 3V

OMEGA= 1815C

IGP1= 3.9e-06 Torr

ramping down @-2A/min TGHT and -1A/min TBHT