Friday, July 24, 2020, 15:00

Ta tube cotaining 497 ZrC discs wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

Saturday, July 25, 2020, 08:57

IGP1= 8.7 e-07 Torr

Start ramp at 0.25 A/min to 20 A on TGHT 

Saturday, July 25, 2020, 10:07

IGP1= 2.7e -06 Torr

Set ramp target to 30 A 

Wednesday, July 29, 2020, 13:11 

OMEGA reading 1700 C at 430 A during the night.  It was kept at this temperature for 3.5 hours.  The OMEGA slope was not changed from 0.990

when IGP1 = 1.2 e-06 Torr and stable, cooling was started at -3A/min at 9 am on this day.

IGP1= 2.2 e-07 Torr now at time of dismounting