Tuesday, November 26, 2019, 14:53
Total number of foils: 504
Total length packed 17.4 cm
container has 3 Ta heat shields.
No endcaps inserted to facilitate out-gassing
Two TaC coated Ta wire springs inserted at either end.
Initially to ramp TGHT and TBHT to 50A at 1A/min
Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically to reach 530A A (Omega slope set = 0.990)
Then temperature= (Correected to 1800C) 1900 C, Omega Slope set = 0.990, manually and automatically ramp to 700A, TGHT will be tapped up accordingly to reach desired Temp.
TBHT will be set fixed at 230 A (max). TBHT heated manually and automatically to max.
Good vac at 3.00 e -5 Torr
Bad vac at 5.00 e-5 Torr
System experienced some vacuum issues due to cooling water leak in a heatshield line.
Evaluation discs not included because no space.
Total Green disc mass measured = 58.250 g
Tuesday, November 26, 2019, 15:00
IGP1= 7.4e-06 Torr. No leak issues found after last fix (Anders will add details).
Tuesday, November 26, 2019, 15:33
TGHT= 52.7A, .22V TBHT= 49.3A, .52V
IGP1= 7.202 e-06 Torr (trending up so will allow to stabilize).
Wednesday, November 27, 2019, 06:09
left with autoramp waiting for vac to drop but no advance overnight.
Pressure did not seem to drop back below 3e-5 Torr magnitude, therefore not much advance in current ramp.
Thursday, November 28, 2019, 11:15
Continued ramping manually
OMEGA = 1429 C (0.99 slope), TGHT = 542A, 7.8V
With slope = 1.08 OMEGA = 1724 C, therefore staying at 0.99 slope
TaC coating sintering plot suggests 753A to reach 1800C (See attachment 1)
Windows a little bit coated but not enough to disturb laser.
Thursday, November 28, 2019, 12:17
TGHT =753A, 11.8V since 12:00 noon.
TBHT= 233.4A, 3.3V
OMEGA= 1735 C (0.99 slope)
Thursday, November 28, 2019, 13:01
OMEGA = 1860C (1.08 slope)
Thursday, November 28, 2019, 14:38
OMEGA temperature began to creep up to ~1880. Tapped TGHT current down to 733.5A, 11.4V
Thursday, November 28, 2019, 15:12
Checked windows and no significant additional buildup of obstructive material.
Temperature creeping up again. Tap down TGHT current to 729 A, 11.2 V
OMEGA = 1870C at slope 1.08
Thursday, November 28, 2019, 16:03
Temperature increase to 1880C
Tap down TGHT current to 715A, 10.9V
OMEGA= 1870 C (slope = 1.08)
Thursday, November 28, 2019, 16:22
Temperature creep to 1880 C
Tap down TGHT to 700A, 10.8V
OMEGA= 1845C
IGP1=2.2e-06 Torr
Thursday, November 28, 2019, 16:37
IGP1= 1.9e-06 Torr
OMEGA = 1850C (1.08 slope)
TGHT = 692A, 10.5V TBHT= 233A, 3.2V
Initiating pressure ramp at -2A/min on TGHT and -1A/min on TBHT
Thursday, November 28, 2019, 16:45
IGP1= 1.28e-06 Torr
OMEGA= 1770 C (1.08 slope)
TGHT = 650A, 9.8V
ramp TGHT at -3.5A/min maintain TBHT at -1A/m in
Thursday, November 28, 2019, 17:11
IGP1= 1.14e-06 Torr
OMEGA = 1730 C (1.08 slope)
ramp TGHT at -5A/min maintain TBHT at -1A/m
Thursday, November 28, 2019, 17:20
IGP1- 8.9e-07 Torr
OMEGA=1636C
ramp TGHT at -6A/min maintain TBHT at -1A/min
Thursday, November 28, 2019, 17:34
IGP1= 7e-07 Torr
OMEGA= 1500 C (1.08 slope)
ramp TGHT at -8A/min maintain TBHT at -1A/min
TBHT = 183A
OMEGA 1180C
TGHT =300 A
TBHT = 155A
Initiated -15A/min TGHT and -4A/min TBHT
IGP1= 5.2e-07 Torr
OMEGA below 1000C
begin manual tapdown
Thursday, November 28, 2019, 19:42
Target was dismounted after cooling. Two graphite discs and end caps inserted.
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