Thursday, June 11, 2020, 09:56

Previous day (Wednesday June 10, 2020) 

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

Thursday, June 11, 2020, 10:19

IEVAP2:IGP1=1.06e-6 Torr

ramping to 40A (TGHT and TBHT) at 1A/min

Thursday, June 11, 2020, 12:35

IEVAP2:IGP1=1.8e-6 Torr

TGHT = 39.8 A, 0.45V

TBHT=38.5 A, 0.48V

Manually rampted to 45A on both TGHT and TBHT 

Thursday, June 11, 2020, 12:58

IEVAP2:IGP1=1.6e-6 Torr

TGHT = 34.8 A, 0.52V

TBHT=44.2A, 0.55V 

Start Autoramp at .5A/min to 400A on TGHT and 230A on TBHT

Thursday, June 11, 2020, 17:14

Irregular pressure profile.  Cooling .  Need to check for leak.

TGHT = 99 A 1.3 V

TBHT = 99 A 1.4 V

Friday, June 12, 2020, 12:59

Restarting ramping

IGP1= 4.98e7 Torr

Autoramp at 1A/min to 400A on TGHT and 230A on TBHT

(pressure and TGHT current and voltage profile seem normal compared to previous coating sintering with the same power supply)

Friday, June 12, 2020, 14:40

Paused ramping

TGHT = 90A

After a few minutes the profile (noise) was still there.  Continue autoramp at 0.5A/min to 400 A on TGHT and 230A on TBHT

Friday, June 12, 2020, 15:21

IGP1= 1.97e-06 Torr trending down

TGHT = 111.5 A , 1.5 V

TBHT = 112.9 A, 1.9 V

Increase ramping speed to 1A/min to 400A on TGHT and 230A on TBHT

Friday, June 12, 2020, 20:50

OMEGA = 1754 C

IGP1= 2.5e-6 Torr

TGHT = 394.1 A, 6.6 V

TBHT = 232.8 A, 4.0 V 

Tapping to 1900 C

Friday, June 12, 2020, 21:00

OMEGA =1901 C

IGP1= 5.6e-6 Torr

TGHT = 448.3 A, 7.5 V

TBHT = 232.8 A, 4.1 V

Saturday, June 13, 2020, 00:51 

 OMEGA = 1898 C

IGP1 = 2.0e-6 Torr

TGHT = 447.2 A, 7.5 V

TBHT = 232.9 A, 4.1 V

Start cooling at -2A/ min for TGHT and -1A/min for TBHT

Thursday, February 10, 2022, 08:52 

Total number of foils: 528 ( including 10 analysis discs)

Weight without springs = 1521.9 g (includes heatshields and T bar)

Total length packed 18.1 cm (including 10 analysis discs that will be removed)

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  ends

Initially to ramp TGHT and TBHT to 50A at0.5 A/min

Then heat automatically heat to OMEGA ~1400 C , then continue to max 530A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 1.0 e-06 Torr at start of initial ramp

IGP1 = 5.7 e-06 Torr

TGHT = 50.0 A, 0.6 V

TBHT = 50.0A, 0.5 V

continue to ramp up at 0.5A/min to 200A

Friday, February 11, 2022, 07:59 

IGP1=3.0e-07 Torr and stable

TGHT= 201A, 2.8V

TBHT = 201A, 2.6V

continue autoramp at 1A/min to 230A on TBHT and 450A on TGHT

Friday, February 11, 2022, 12:41

IGP1= 6.6e-05 Torr

TGHT= 450A, 6.5V

TBHT= 232A, 3.1V

OMEGA = 1258C

Allowing pressure to drop.  Will continue ramp up when [pressure around 9-e-6 Torr

Friday, February 11, 2022, 13:59

IGP1= 2.4e-05 Torr

Will ramp up at 1A/min to 550A on TGHT

Friday, February 11, 2022, 15:54  

IGP1= 2.4e-05 Torr

TGHT= 551.0A, 8.3V

TBHT=232A, 3.2V

OMEGA= 1426 C

ramp to 600 A @ 2A/min

Friday, February 11, 2022, 16:23

TGHT= 600.1A, 9.3V

TBHT= 232A, 3.2V

OMEGA = 1612C

ramp to 689 @2A/min to 1800 C as projected in regression plot attached 

Friday, February 11, 2022, 21:20 

Evap has been at 1800 +/- 20 C for 4 hours and 10 minutes

OMEGA 1802 C

TGHT = 689 A, 11.0V

TBHT=232.8 A, 3.26V

IGP1= 1.3e-05 Torr and stabilizing.  

will start cool down at -2A/min TGHT and -1A/min TBHT