Darwin Ortiz Rosales wrote:

John Wong wrote: Carla Babcock wrote: Darwin Ortiz Rosales wrote: Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.  Vacuum spike at 300A. Currently: TGHT= 316A, 4.6V TBHT=283A, 3.9V Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A

 Thursday, April 27, 2023, 22:04

TGHT has reached 580A/10.33V. Temp = 1540C. 

The two out-gassing peaks were observed: 1st peak around 1300C and 2nd peak 1370C.  See attachments 1 & 2.

A few minutes after TGHT reached to 580A, there was a small jump in TGHT current/voltage and also the pressure, but didn't notice any change in the temp, see attachment 3&4. 

Pressure is currently at 3.4e-6 Torr; will hold TGHT until pressure reaches close to 1e-6 Torr before cooling down. 

 Friday, April 28, 2023, 01:06

Pressure has reached 1.8 e-6 Torr; TGHT has been holding at 580A for 3.5 hrs, a slight increase in voltage, reading at 10.45V and temperature, 1548C.  See attachment #5 for overview.

Initiating auto-cooling TGHT at -2A/min, TBHT at -1A/min.