Friday, May 29, 2020, 08:52
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
Good vacuum= 3.00 e-5 Torr
Bad vacuum = 5.00 e-5 Torr
Ramped TGHT and TBHT to 40A at 0.5A/min
Initial IGP1 = 3.7e-7 Torr
Friday, May 29, 2020, 10:23
Autoramp deliver 40 A
TGHT = 0.47 V, 40.72 A
TBHT = 0.5 V, 38.78 A
IGP1 = 4.5 e-6 Torr and going down
Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.
Friday, May 29, 2020, 11:27
Autoramp was stopped at 70 A, since pressure kept increasing, current was manually decreased to 65 A in both TGHT and TBHT.
The system will remain at current conditions until pressure reduce.
Friday, May 29, 2020, 12:44
Autoramp TGHT and TBHT at 1A/min to 400A and 230A respectively.
Saturday, May 30, 2020, 00:23
Autoramp deliver 400 A at TGHT and 230 A at TBHT
TGHT = 7.8 V, 453.9 A
TBHT = 4.21 V, 232.9 A
IGP1 = 9.7 e-6 Torr and going down
Omega = 1893 degC
Autoramp TGHT and TBHT at -1A/min to 400 A
Initiating auto-cool at -2.0A/min and -1.0A/min for the TGHT and TBHT respectively
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