Thursday, February 21, 2019, 09:01

Container coated with TaC and wrapped with 2 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 was started on Wednesday February 20th; however, this morning IEVAP2:TP1 and IEVAP2:BV1 were found in the OFF position.

There are no abnormal sounds from the roughing pump.

IGP1= 5.6e-2 Torr

Will turn on IEVAP2:BV1 and IEVAP:TP1 from the hot lab and listen for anything out of the ordinary.

 Friday, February 22, 2019, 09:56

Pumped down to IGP1=2.1 e-07

Will tap up TGHT and TBHTmanually and monitor the pressure.

Friday, February 22, 2019, 11:20

Manually tapped up TGHT (V~ 0.90) and TBHT(V ~0.99) to 90A

maximum pressure reached ~7.4e-06 Torr and trended down

Friday, February 22, 2019, 11:25

Initiating Autoramp @ 0.2 A/min for TGHT to reach 450A and TBHT to reach 230A

Estimated temperature for TGHT ~1200 C
 

 Friday, February 22, 2019, 15:42

TGHT @ 145 A and TBHT @ 138A

Changed Autoramp to 0.1 A/min  so that it will take over the weekend to reach 450A and 230A for TGHT and TBHT respectively.

Monday, February 25, 2019, 08:29

IGP1=1.1e-07 Torr, TGHT= 451.4 A, 6.7 V, TBHT = 233.1 A, 3.1 V

Omega T = 1197 C

Will manually tap up by increasing TGHT current by ~1A/min monitoring pressure.   Will allow system to stabilize ~1400 C.

 Monday, February 25, 2019, 11:14

 Trend forcast 1400 C at TGHT= 566.75 A (Line plot attached)

Actual but not stable ~1445-1452 C at 566 A

Will continue to manually increase current monitoring pressure

 Monday, February 25, 2019, 12:33

Omega T= 1679 C , TGHT = 657.7A, 10.52 V, TBHT = 233.2 A, 3.2 V

IGP1 = 1.4e-05 Torr slightly trending up.

Autoramp @ 1 A/min to a maximum of TGHT 780 A. 

Monday, February 25, 2019, 14:43

IGP1= 3.7e-06 Torr trending down slightly, TGHT = 780.3 A, 12.9 V

Omega T = 1931 C

Monday, February 25, 2019, 15:14

manually tap up to TGHT to 790 A

Monday, February 25, 2019, 15:36

IGP1= 2.9e-6 Torr trending down

TGHT = 784.3 A, 13.01 V

TGHT current set to 790 A

Omega T = 1940 C

Will leave over-night

 Tuesday, February 26, 2019, 08:23

IGP1= 7.85e-07 Torr Stable

TGHT = 784.32 A, 12.54 V

TBHT = 233.3 A, 3.2 V

OMEGA T = 1948 C

Initiating Auto-cool ramp at 2.0A/min and 1.0A/min for TGHT and TBHT respectively.

Wednesday, February 27, 2019, 08:10

IGP1 = 3.3 e-08 Torr Stable

TGHT = 0A, 0.05V

TBHT = 0.02A, 0. V

Will begin vacuum release

Monday, November 04, 2019, 14:19 

Each endcap is separated with a disc of graphite foil and rolled into packs one pack of 4 and one pack of 8 within a foil envelope in a target boat.

There are also 3 coated springs interspersed.

The boat is wrapped with 3-layers of Ta heatshields.

Chamber pumped down overnight.

OMEGA slope = 0.99

Will Tap TGHT up to 40 A then autoramp to 400A at 1A/min.

Final desired temperature on OMEGA (tap)= 1800C

 Tuesday, November 05, 2019, 11:30

IGP1 = 9.6e-7 Torr

Autoramp TGHT to 40A at 1A/min

Tuesday, November 05, 2019, 11:44

IGP1= 2.6e-06 Torr

TGHT = 40.8 A, 0.37V

Will leave at 40 A for 1 hour

 Tuesday, November 05, 2019, 12:39

 IGP1=2.5e-6 Torr

TGHT =40.0A, .33V

Start ramping TGHT to 400A at 0.1A/min

Wednesday, November 06, 2019, 09:32

IGP1=7.8e-7 Torr

TGHT = 168.4A, 2.38V

increase ramp speed to 1A/min

 Wednesday, November 06, 2019, 14:07

IGP1= 2.34e-6 Torr

TGHT=400.0 A, 6.98V

set TGHT autoramp to 460A @ 1A/min aiming for 1850C (see attached plot)

Wednesday, November 06, 2019, 15:18

OMEGA = 1776 C

TGHT = 460.0A, 8.52V

IGP1= 4.7e-6 Torr

Starting manual tap up to 1810C

Wednesday, November 06, 2019, 15:36

OMEGA=1810 C

TGHT = 468.8A, 8.74V

IGP1=4.14e-6

Wednesday, November 06, 2019, 19:04

OMEGA=1822 C (has been between 1817-1824 C over 3.5 hours )

TGHT=468.8A, 8.67V

IGP1=1.9498e-06 Torr

Start TGHT ramp down at -2A/min

Thursday, November 07, 2019, 09:55

THGT = 0A, 0V overnight

IGP1= 3.2 e-07 Torr

Proceeding with unloading.

End caps looked good for online use.

 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