Tuesday, February 28, 2023, 07:19

Ta LP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (4 layers)

Desired temperature = 1850 C , TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

OMEGA slope= 0.990

Good vacuum = 5.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @1A/min to 80 A then autoramp heat @1A/min to 150 A.  Then autoramp TGHT to 400 A and TBHT to 230A.1

Tuesday, February 28, 2023, 15:39

Will ramp to 426A to 1850C as per regression line. 

Tuesday, February 28, 2023, 15:57

Will start cooling at 8 pm

OMEGA= 1858 C

IGP1= 2.12e-06 Torr

TGHT =426 A, 7.5 V

TBHT = 230 A, 3.2 V

Tuesday, February 28, 2023, 19:58

OMEGA = 1858 C

IGP1 = 1.04e-06 Torr

TGHT =426 A, 7.6 V

TBHT = 230 A, 3.2 V

rampdown TGHT at -2A/min and TBHT @ -1A/min