Monday, March 9, 2020, 03:15
Container coated with TaC and wrapped with 3 Ta heat shields.
Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.
TBHT will be set fixed at 230 A (max).
Good vac at 3.00e -5 Torr
Bad vac at 5.00e-5 Torr
Chamber pump down
Tuesday, March 10, 2020, 09:17
Starting manual ramp to 50 A @ approximately 2A/min
IGP1 = 3.73e-7 Torr after opening water line pressure slowly incresed to 4.4e-7 Torr
TBHT also has Chiller interlock reached out to controls for removal.
Tuesday, March 10, 2020, 10:47
Chiller Interlock removed for TBHT. Started manual ramp to 50A @ approximately 2A/min
Tuesday, March 10, 2020, 11:15
allowing to stabilize at 50A on TGHT and TBHT
IGP1= 7.9 e=7 Torr and trending up
Tuesday, March 10, 2020, 12:09
Pressure on IGP1 spiked. Allowing to stabilize.
Tuesday, March 10, 2020, 14:36: Stopped By to check. Vacuum @ 3.02e-03T. Turbo pump appears to have tripped. Shut off Both PS. Prepare to vent. - Aaron S.
Tuesday, March 10, 2020, 14:48: Tightened all fittings (Just in case). HS side & HS waterline at the feed through. Roughing.
Tuesday, March 10, 2020, 15:06: TP1 @ 38KRPM 1.34e-04T & dropping. TGHT & TBHT PS on. Monitor before heating. -AS
Wednesday, March 11, 2020, 06:25: Vacuum @ 3.39e-07T. TGHT / TBHT PS on. - AS
Wednesday, March 11, 2020, 06:26: Manually tapped up TGHT / TBHT to 10 / 10 A. Ok.
Wednesday, March 11, 2020, 06:28: Auto-ramping TGHT / TBHT @ 4 A per min to 50 / 50 A.
Wednesday, March 11, 2020, 07:07: Vacuum @ 3.64e-07T. TGHT / TBHT @ 50 A. All appears stable. - AS
Wednesday, March 11, 2020, 07:036
Started autoramp at 2 A/min
IGP1= 3.6e-7 Torr
Wednesday, March 11, 2020, 08:06
TGHT=10 5A, 1.3 V TBHT = 105 A, 1.2 V
pressure rising fast; manual ramp down to 95A on both TGHT and TBHT
Wednesday, March 11, 2020, 09:54
IGP1= 4.7e-6 Torr; TGHT = 93.1 A, 1.2 V; TBHT = 95.1 A, 1.1 V
start autoramp at 1A/min (0.5 A/30s)
IGP1= 1.28e-5 Torr
TGHT = 108.3 A, 1.44 V
TBHT = 110 A, 1.29 V
Stop autoramp
Wednesday, March 11, 2020, 10:25
IGP1= 5.9e-5 Torr
manually tapped TGHT and TBHT set-current to 105 A respectively.
pressure dropping.
Wednesday, March 11, 2020, 11:18
IGP1=8.0e-06 Torr
manually ramp to set-current 115 A for both TGHT and TBHT at approximately 2A/ min
allow to stabilize before proceeding
Wednesday, March 11, 2020, 12:12
IGP1=7.02e-6 Torr
TGHT = 112.7 A, 1.5 V
TBHT = 114.6 A, 1.4 V
Auto-ramping at 1A/min TGHT to 430 A and TBHT top 230A
Wednesday, March 11, 2020, 18:45
IGP1= 1.2 e-06 Torr
TGHT=421.8 A, 6.2 V
TBHT = 231.9 A, 3.1 V
auto-ramp TGHT at 1A/min to set-current 530A
Wednesday, March 11, 2020, 23:08
IGP1= 1.3e-6 Torr
TGHT= 519.9 A, 7.87V
TBHT = 232.0 A, 3.1 V
start autoramp TGHT to 600A at 1A/min
Wednesday, March 11, 2020, 23:36
IGP1= 1.6e-6 Torr
TGHT = 542.9 A, 8.2V
TBHT = 232.9 A, 3.1V
Set autoramp to 750A on TGHT at 0.5 A/min
Thursday, March 12, 2020, 06:55
The Voltage set on TGHT was too low so current had not increased
IGP1= 1.5e-6 Torr
TGHT = 640 A, 10V
TBHT 232/9A, 3.1V
Oncrease TGHT voltage set to 14.5 and start autoramp at 3A/min to 750 A
Thursday, March 12, 2020, 7:43
TGHT = 735.7 A, 11.8V
OMEGA = 1595C
Auto -ramp set to 780 A for TGHT
Thursday, March 12, 2020, 7:58
OMEGA = 1655 C
TGHT set to 800 A at 3A/min
Thursday, March 12, 2020, 9:42
OMEGA = 1704 C
TGHT = 789.5 A, 13.0 V
Manual tap up to 837 A set on TGHT and 821 A readback
Thursday, March 12, 2020, 10:00
TGHT readback = 821.0 A, 13.7 V
OMEGA = 1744 C
TBHT same as previous entry.
Thursday, March 12, 2020, 10:35
Tapped up TGHT to 832.6 A, 13.8 V
OMEGA = 1759 C
TBHT = 232.9 A, 3.6 V
Will not tap further.
Thursday, March 12, 2020, 13:22
IGP1 = 5.0 e-06 Torr (stable)
TGHT = 832.7 A readback (849 A set), 13.7V
TBHT = 232.9 A, 3.6 V
OMEGA = 1758 C
Start cooling at TGHT 3A/min
Thursday, March 12, 2020, 14:08
IGP1= 1.32e-06 Torr
TGHT = 706 A, 11.0 V
TBHT = same as previous
OMEGA = 1583C
Start cooling TBHT at 1A/min continue cooling TGHT at 3A/min
Friday, March 13, 2020, 08:18
IGP1= 3.9e-8 Torr
Will unload sintered container
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