Wednesday, September 08, 2021, 12:36

297 C discs were loaded onto a Ta tube wrapped in 3 Ta heatshields. (10 of which are analysis discs).  They should be the first to be pushed out as they were loaded last.

The discs were loaded upside down to facilitate transfer to final container post conditioning.

a Ta foil disc was placed at the front end and a Ta spring at the back end of the tube.

The weight of the whole system is 254.4 g

Evap 2 was left to reduce pressure overnight.

Target temperature is 2000 C for five hours @ approx 450A

Good vacuum = 3e-2 Torr

Bad vacumm= 5e-2 Torr

 Thursday, September 09, 2021, 08:46IGP1= 7.5 e-07 Torr

Will manually ramp up TGHT to 80 A 

Thursday, September 09, 2021, 09:09 

pressure began to rise at 50A so will leave at 50 A waiting for stabilization.

Current began to shoot up to rapidly, lowered current to 40A.  

Thursday, September 09, 2021, 10:34

At IGP1= 1.3e-4 Torr manually increasing current again 

Thursday, September 09, 2021, 12:52 

IGP1= 8.6e-5 and dropping

TGHT = 60A, 0.87 V

Will begin autoramp to 120A at 1A/min

Thursday, September 09, 2021, 14:06

IGP1= 3.2e-05Torr

TGH T= 120A, 1.9V

Set autoramp to 1A/10s to 200A 

Thursday, September 09, 2021, 14:57

IGP1=  1.5e-05 Torr

TGHT = 200A, 3.4V

Set Autoram to 2A/10s to 450A

OMEGA = 1249 C

 At 258A OMEGA = 1420 C

continue ramp up at 2A/10s to 450

projected 2000 C is 454 A

Thursday, September 09, 2021, 16:10 

Tapped up to 470 A and OMEGA 1993C.  Will leave at this current because T may rise.  

Thursday, September 09, 2021, 21:21

OMEGA 2011 C

IGP1 = 6.9e-06 Torr

Ramping down @ -1 A/min

Thursday, September 09, 2021, 17:27

Temperature kept around 2000 C by reducing current.  It was reduced to 455A and Temperature stabilized .  Time of ramp down will be  21:10