Thursday, September 02, 2021, 06:36

Ta 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 was pumped down over previous night

Good vacuum = 3.00 e-5 Torr

Bad vacuum = 5.00 e-4 Torr

IGP1=7.7e-07 Torr

Initiate autoramp to 50 A @ 1A/min

Thursday, September 02, 2021, 06:54 

Stopped autoramp after reading email about EF-12 trip and compressed air issue.  Reset to 0 A both TGHT and TBHT

Thursday, September 02, 2021, 12:01

Ispite of site compressed air issues, EVAP 2 has not tripped.  Will manually increase current to40A for both TGHT and TBHT.

IGP1= 1.06 E-06 Torr. 

Friday, September 03, 2021, 08:06

 IGP1= 7.2e-07 Torr

TGHT= 43A, 0.5 V

TBHT= 41A, 0.48 V

Start autoramp at 1A/min to 90A on both TGHT and TBHT

Friday, September 03, 2021, 10:22

IGP1= 1.55 e-06 Torr

TGHT = 90.1 A, 1.1 V

TBHT= 90.0 A, 1.2 V

Continue ramp up at 1A/min to 400 A for TGHT and 230A for TBHT 

Friday, September 03, 2021, 16:05

430A on TGHT will keep for four hours.  OMEGA = 1856 C but according to regression should be 1900.  will keep at this temp. 

Friday, September 03, 2021, 21:11

OMEGA has been at 1875C for 4 hours.  Will start ramp down @ -2A per minute for TGHT and -1A min for TBHT

TGHT = 430 A, 7.3 V   (current actually fluctuates between 428 and 433 A since new power supply

TBHT = 233A, 4.0V  (set to 230 but displays 233)