Wednesday, March 09, 2022, 06:25

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

Good vacuum = 3.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @1A/min to 60 A

Wednesday, March 09, 2022, 09:29

 TGHT= 60 A 0.67 V

TBHT = 60A 0.59V

IGP1= 1.77e-6 Torr

autoramp @ 2A/min to 120 A and monitor (both TGHT and TBHT)

Wednesday, March 09, 2022, 10:19

IGP1 was increasing to fast.  Manually lowered current to 105A on both TGHT and TBHT.

Will allow pressure to stabilize

Plant group requested maintenance work for EF12/13

Therefore, keeping system as is until further instructions from plant group.

Thursday, March 10, 2022, 15:18

Will resume ramp up to 120 A for both TGHT and TBHT @ 1A/min

 IGP1= 6.4 e-07 Torr

Thursday, March 10, 2022, 15:30

Increase ramp rate to 2A/min 

Thursday, March 10, 2022, 17:41

@ 245 A TGHT and 230A TBHT ramp back down to 100 A for both as OMEGA not displaying Temperature.  Will need to go in tomorrow to fix OMEGA 

Friday, March 11, 2022, 14:25

Ramping at 2A/min to 230A for both TGHT and TBHT

Friday, March 11, 2022, 15:17

IGP1= 1.23e-6 Torr

Continue Ramping TGHT @ 3A/min to 400 A keep TBHT at 230A

Friday, March 11, 2022, 22:22

@ TGHT 725 A 1800 C was reached on OMEGA

Kept there since 7:20 pm.  Start rampdown at 11:20 pm.

Friday, March 11, 2022, 23:19  

 IGP1= 6.9e-6 Torr

OMEGA= 1805C

TGHT= 725 A, 10.9V

TBHT= 232A, 3.1V

Start rampdown at -2A/min on TGHT and -1A/min for TBHT