Tuesday, July 10, 2018, 16:40

Container was flashed with TaC solution and let dry in air. 

No Ta heat shield is used. 

Desired temperature 1900C, ramp up TGHT accordingly. (Take note at 1500 and 1600 C).  

OMEGA slope setting = 0.98

TBHT set at 250A (as usual)

Chamber is currently being pump down.

 Wednesday, July 11, 2018, 10:54

Pressure at 4.5 e-7 Torr. 

Autoramping TGHT at 0.1A/min to reach 300A and TBHT at 0.1A/min to reach 230A. 

Once TGHT setting is reached, it will be further increased according to the temp measurement. 

 Friday, July 13, 2018, 10:57

TGHT at 300A/4.02V but temp is still too low to be detected. 

Increase TGHT to 400A, ramping at 1A/min.  TBHT is already at 230A/4.0V.

Current pressure at 4.4e-7 Torr.

 Friday, July 13, 2018, 13:09

TGHT reached 400A/5.85V, temp reading 1112C.

Ramping up to 500A

 TGHT reached 500A/7.9V.  temp reading 1250 C.

Ramping up to 600A

 Friday, July 13, 2018, 17:13

TGHT reached 600A/10.74V, temp reading 1742 C.

Ramping up to 650A

 Wednesday, July 18, 2018, 11:54

TGHT has remained at 650A/12.05V since Friday July 13.

Temperature check:

pyrometer: 1650 (250 correction) = 1900 C

OMEGA:  1-color (e= 0.32 for spectral hemispherical) = 1910 C

OMEGA: 2-color (slope @ 0.99) = 1905 C

Measurements are in agreement

Cooling TGHT at 2A/min, TBHT at 1A/min. Current pressure 3.7e-7 Torr.

 Wednesday, July 18, 2018, 13:47

TGHT at 500A, 8.4V, temp at 1600 C (4.2 kW)

TGHT at 475/7.84V, temp at 1550 C (3.72 kW - Max operating target heating power)

TGHT at 450/7.31V, temp at 1500 C (3.28 kW)

With TBHT set for 230A, usual operation setting, the temperature on the transfer tube is to exceed 2000 C.  Keeping TBHT at that setting may affect the overall temperature.

Note:  To condition the nanoSiC, it is better to keep TBHT at 0A and ramp up TGHT to 475A while monitoring the vacuum.  Then step up TBHT; any increase in vacuum would indicate a local evaporation of nanoSiC close to the ionizer. 

Temp measurement is complete, cooling down TGHT/TBHT to zero.

 Thursday, July 19, 2018, 12:23

TGHT has been at 0A for over 18 hours.  Vacuum pressure at 7e-8 Torr.

Venting chamber.

Wednesday, July 25, 2018, 17:32

Container is coated with TaC and wrapped with 3 layers of Ta heat-shields.

Desired sintering temperature ~1900 C, TGHT is estimated to be ~ 445A (3.3 kW), TBHT set to 230A (as usual).

OMEGA slope set to 0.99

Good vac = 3.0 e-5 Torr, Bad vac = 5.0 e-5 Torr.

Chamber is currently being pumped down.

 Friday, July 27, 2018, 10:32

Vacuum at 9.9 e-7 Torr. 

Autoramp TGHT at 1A/min to 300A and TBHT at 1A/min to 230A. Will monitor temp and adjust TGHT to reach the desire temp.

 Friday, July 27, 2018, 16:31

TGHT reached to 1500 C, and TBHT at 230A, Temp at 1480 C, pressure at 2.e-6 Torr.

Autoramp TGHt at 1A/min to 400A.  Continue monitoring temp.

 Saturday, July 28, 2018, 12:41

TGHT at 400A/6.2V. Temp at 1730 C.  Pressure 7.4 e-7 Torr.

Tapped up TGHT to 450A/7.2V, temp at 1891 C. Holding at this current... Pressure coming down from 1.2e-6 Torr.

 Monday, July 30, 2018, 22:40

Target temp has been held at 1880 C, TGHT at 450A/7.57V, TBHT 230/4.18V, vaccum at 3.8 e-7 Torr. 

Cooling TGHT and TBHT at 2A/min and 1A/min, respectively. 

 Tuesday, July 31, 2018, 10:23

TGHT/TBHT at 0A.  Pressure at 1.5e-7 Torr. 

Process completed. 

Venting chamber.

Target containers looks good.  Transferred to Ar glovebox.

Tuesday, September 04, 2018, 16:58

Container is coated with TaC and wrapped with Ta heat-shield ( 3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down

 Wednesday, September 05, 2018, 10:53

Pressure at 9.5-7 Torr. 

Auto ramping TGHT at 1A/min to reach 400A, and TBHT at 1A/min to reach 230A.

 Wednesday, September 05, 2018, 17:52

Problem with TGHT readback vs setpoint.  TGHT ramped up to 400A, temp measured at 1830C.  However, the setup remained at 228A (see attachment).  The autoramping program only sees the readback; in this case, the TGHT would continue to keep ramping up until the target breaks.  The autoramping program has stopped just in time. 

TGHT stepped down to 400A (setpoint), readback at 206A/6.59V.  TGHT at 230A/4.16V.  Temperature holding at 1783C. 

Control has been informed.

 Thursday, September 06, 2018, 10:54

Target temp holding at 1773C.  Pressure at 8.5e-7 Torr. 

Ramping down TGHT and TBHT, and inspect the container later. 

Problem with the TGHT readback/setpoint will need to be investigated.

 Friday, September 07, 2018, 16:03

Target container is nicely sintered.

Awaiting for Control group to investigate with the problem on TGHT readback/setpoint. 

 Monday, September 10, 2018, 15:09

Container is coated with TaC and wrapped with Ta heat-shield ( 3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down

 Tuesday, September 11, 2018, 09:27

Pressure at IGP1 8.61e-7 Torr. 

Auto ramping TGHT at 1A/min to reach 400A, and TBHT at 1A/min to reach 230A.

 Tuesday, September 11, 2018, 12:05

Pressure increased to 6.9e-e5 Torr and auto-ramp reduced the current:

TGHT from 94.6 A to 84.86 A

TBHT from 87.8 A to 78.87 A

(see figure EVAP2-_01)

EPICS automatically started ramping up TBHT and TGHT current when the pressure was between the good limit.

 Tuesday, September 11, 2018, 14:29

TBHT current reached ~230 A and EPICS stopped inputting current automatically. 

TBHT current reading on:

EPICS 232.8 A

Power supply: 235 A

 Tuesday, September 11, 2018, 16:53

TGHT reached 400 A, EPICS stopped auto-ramping automatically. (Fig. Heater-ramp and Plot_400A-230A)

Temperature read by OMEGA 1837 C (Fig. Tempeature-at-400A)

 Tuesday, September 11, 2018, 17:40

TGHT current was increased manually to 419 A (power supply current 422 A, EPICS plot 421.6 A) in steps of ~5A/2min

The temperature after ~30 min of being at 419 A is 1898 C.

The container will stay 5 hours at 1898 C 

Wednesday, September 12, 2018, 09:05 

EVAP2 remained at max setpoints for 5hrs

Auto-cool was set to 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

The automatic ramp decreased the TBHT current to 0A, but not so for TGHT, 

TGHT only reduced to 22 A, the TGHT was manually tapped to 0A

 Wednesday, September 12, 2018, 18:30

Process completed (fig. TaC-coating). 

Chamber was vented.

 Friday, November 02, 2018, 17:33

A new LP-FEBIAD was coated and syntered (e-log 421 Evaporator_2) 

The container was loaded with an empty graphite insert.

Graphite insert mass = 24.1724 g

A current of 440 A TGHT and 230 A TBHT will be inputed to the container

EVAP2 currently pumping down

 Saturday, November 03, 2018, 08:04

IGP1 = 5.66e-7 Torr

Tapping manually to 40 A on TGHT and TBHT

Then auto/ramp wiill be set to 2 A/min on TGHT and 1 A/min on TBHT

Maximum temperature achieve 1802 C

 Tuesday, November 06, 2018, 14:49

Container has reduced and increased its temperature from ~1760 to 1802 C.

IGP1  3.44e-7 Torr

TGHT 441.7 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Wednesday, November 07, 2018, 08:32

Temperature 1785 C

IGP1  2.90e-7 Torr

TGHT 441.38 A and 7.7 V

TBHT 233.2 A and 3.2 V

 Friday, November 09, 2018, 17:26

Temperature 1787 C

IGP1  2.12 -7 Torr

TGHT 442.03 A and 7.7 V

TBHT 233.06 A and 3.19 V

Tuesday, November 13, 2018, 14:13: Turbos, power supplies off. Prepare for venting. 

 Monday, November 19, 2018, 08:57

Tantalum tube was coated with TaC and wrapped with Ta heat-shield (3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V), TBHT will be set fixed at 230A (max).

Pressure at IGP1 2.61-7 Torr. 

Tapped up TGHT and TBHT manually to 40 A

Waited ~1 hr for vacuum to stabilize.

IGP1 = 4.27e-7 Torr

Good vac at 3.00e-5 Torr

Bad vac at 5.00e-5 Torr.

Initiating auto ramp for TGHT @ 1 A/min to a max setpoint of 350 A

Once max setpoints achieved, will tap up manually to final desired temperature of 1900 C

Monday, November 19, 2018, 18:14

Temperature was 1755 C at 350 A

IGP1 = 9.28e-7 Torr

Tapped manually to 393 A (6.83 V)

IGP1 = 1.4e-6 Torr

Temperature 1904 C

The tube will stay at max current point overnight.

Tuesday, November 20, 2018, 08:17

 IGP1 = 9.28e-7 Torr

TGHT = 395 A, 6.98 V

Temperature 1903 C

Auto-ramp set to TGHT 0 A @ -2 A/min. 

Friday, January 18, 2019, 15:00

Container was coated with TaC and wrapped with 3 Ta heat shields.

Desired temp = 1900 C, Omega slope set = 0.990, Auto ramping TGHT at 1A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230A (max). TBHT at 1A/min to reach 230A.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down.  Sintering will proceed next week.

 Monday, January 21, 2019, 10:17

Current pressure at IGP1 = 1.31e-7 Torr

Manual tapping to 50A on TBHT and TGHT

TBHT 38.75A, 0.41V

TGHT 37.5A, 0.07V

waiting for pressure to stabilize.

pressure  IGP1 8.0 e-7 Torr

Auto ramping TGHT at 1A/min to reach 400A, and TBHT at 1A/min to reach 230A.

 Tuesday, January 22, 2019, 09:34

TGHT reached 400A , 1800 C, however temperature dropped to 1785 C.

TGHT increased to 444A manually.  Temperature stabilized at 1880 C.  

After 10 hours, TGHT was ramped down @ 2A/min and TBHT @1A/min

Tuesday, January 22, 2019, 14:36: Evap 2 PS off. Turbo off (Around 14:10) Vented Evap 2 and removed the target container with Darwin. - AS.  

Thursday, February 07, 2019, 14:12

Tantalum tube coated with TaC and wrapped with 3 layers of Ta heat-shielding.

Desired temperature= 1900 Celsius (expected TGHT ~445A/7.5V)

EVAP2 Currently pumped down, heating will be initiated tomorrow.

Friday, February 08, 2019, 08:46

Current pressure IGP1 = 3.46e-07 Torr

Manual tapping to 50A on TGHT

TGHT 47.43A, 0.26V

Waiting for pressure to stabilize.

Pressure was going down so current was increased manually to 65 A to induce the outgassing.

TGHT 73.9A, 0.67V

MAx pressure IGP1 = 4.41e-6 Torr

After approx 1 hour

TGHT = 0.70 V  74.1 A

IGP1 = 1.63 e-6 Torr

Autoramp was set to 2 A/min for final current of 350 A

 Friday, February 08, 2019, 13:43

Autoramp TGHT reached 350 A /5.47 V, current temperature at 1660 Celsius

IGP1 = 3.0e-06 Torr/coming down

Increase TGHT to 400 A autoramp at 2A/min

 Friday, February 08, 2019, 14:39

TGHT reached 413 A, 6.8 V, pressure at 1.9 e-06 Torr coming down

Continue to tap up TGHT to reach 1900 C

Friday, February 08, 2019, 14:56

TGHT manually increased to 428 A, 7.18V, pressure at 2.0e-06 Torr coming down slowly

Temperature at 1903 C

Will continue to heat at ~1900 C for four hours before cooling down

 Friday, February 08, 2019, 21:00

TGHT 7.21 V, 429.75 A, 1873 C

IGP1 6.77e-7 Torr

The heater ramp is set to -2 A/min to 0 A.

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

Thursday, March 07, 2019, 09:09

Transfer tube from Legnaro was coated with TaC.

The transfer tube was set in a tantalum boat and wrapped with 3 heat shields,

the legs of the transfer tube were let out of the shielding sheets.

Chamber pump down was started on Wednesday March 06, 2019.

Desired temperature TGHT = 1800 C, Omega slope set = 0.990.

IGP1= 4.48e-07 Torr

Will tap up TGHT manually to 40-50 A and monitor pressure.

 Thursday, March 07, 2019, 10:57

The TGHT current was left at 40 A for 50 min, the pressure achieved was 6.15e-7 Torr

The TGHT was rised to 45 A 11:00 am the pressure rised to 6.18e-7 Torr (11:10am)

The TGHT was rised to 50 A 11:10 am the pressure rised to 6.81e-7 Torr (11:32am)

auto ramp was set to 1 A/min to 300 A

Good vacuum 3e-5 Torr

Bad vaccum 5e-5 Torr

auto ramp was set to 1 A/min to 400 A

auto ramp was set to 1 A/min to 470 A

Final conditions TGHT = 485 A, 8.25V Temperature = 1800 C

The transfer tube stayed at 1800 C for 4 hours

auto ramp was set to -1 A/min to 0 A. 

Friday, March 08, 2019, 16:53 

EVAP2 was vented with air and the transfer tube was unloaded

Tuesday, April 30, 2019, 09:33

Container was coated with TaC and wrapped with 2 Ta heat shields.

Desired temp = 1900 C, Omega slope set = 0.990, Auto ramping TGHT at 1A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230A (max). TBHT at 1A/min to reach 230A.

Good vac at 3.0e-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down (since yesterday evening).

Tuesday, April 30, 2019, 10:25 

Current pressure at IGP1 = 5.17e-7 Torr

Manual tapping to 40A on TBHT and TGHT

TBHT 38.59A, 0.43V

TGHT43.69, 0.23V

waiting for pressure to stabilize.

 Tuesday, April 30, 2019, 15:15

Current pressure IGP1= 5.29e-07 Torr

Auto ramping TGHT at 1A/min to reach 400A, and TBHT at 1A/min to reach 230A.

Wednesday, May 01, 2019, 08:41

Target current of 400A reached around 00:19 am

Will tap up to 444A on TGHT as projected from plot of temperature vs current (attachment 1)

Current IGP1=5.91e-07 Torr

Wednesday, May 01, 2019, 09:54

At 444A 1900C not reached.  Continue tapping to 1900C (attachment 2)

1900 C reached at 459 A on THGT.

will leave at 1900C for 4 hours.

 Wednesday, May 01, 2019, 14:21

IGP1= 6.7e-7 Torr

After 4.5  hours, TGHT was ramped down @ 2A/min and TBHT @1A/min overnight

Thursday, May 02, 2019, 10:46

 Vented Evap 2 and removed the target container.

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

 Sunday, May 24, 2020, 06:54

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 = 2.5e-7 Torr

Sunday, May 24, 2020, 08:24

Autoramp deliver 40 A

TGHT = 0.58 V, 39.6 A

TBHT = 0.46 V, 39.81 A

IGP1 = 2.9 e-7 Torr and increasing

Heater conditions will be hold for 15 min to account for pressure changes.

 Sunday, May 24, 2020, 08:39

IGP1 = 2.7e-7 Torr and decreasing

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

 Sunday, May 24, 2020, 14:57

After 15 min the autoramp stopped

TGHT = 6.8 V, 394.65 A

TBHT =4 V, 232.9 A

IGP1 = 2.2e-6 Torr and going down

Omega = 1747 degC

Autoramp set to TGHT 1A/min to 450A

Sunday, May 24, 2020, 16:07

After 15 min the autoramp stopped

TGHT = 7.7 V, 448 A

IGP1 = 2.88e-6 Torr

Omega = 1886 degC

The current will be increased manually to reach 1900 deg C

Final TGHT = 7.9 V, 453.15 A (455 A input)

Omega = 1899 degC

The TGHT and TBHT will leave at current conditions until pressure reduce (approx 4 hours)

Sunday, May 24, 2020, 20:01

TGHT = 7.9 V, 456 A

TBHT = 4 V, 232.9 A

IGP1 = 1.8e-6 Torr

Omega = 1893 degC

Initiating auto-cool at -2.0A/min and -1.0A/min for the TGHT and TBHT respectively.

 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.

 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

 Monday, June 15, 2020, 13:30

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

Boat with attached thermocouple type C with AREMCO ceramabond glue installed in evap2 the 30-07-2020

Vacuum 3.2e-6torr in IGP1 after night with the roughing pump and morning with turbo.

TGHT heater on.

ramp up started

1A/20s up to 200A

Thermocouple de-attached at about 400A.

Target cooled down. 1A/10s

Turbo and roughing pump off. System left with present vacuum over night. Tomorrow inspection.

 2020-08-05 7.13pm Roughing pump on

2020-08-06 10:48am Turbo was turned on by Marla in the morning. Vacuum IGP1 4e-6Torr. Water leak check performed, everything good to start heating up target. Waiting for Anders confirmation to start.

2020-08-06 4:38pm after changing setup to metallic connections only. Roughing on. After some minutes abnormal behavior in vacuum.

Turning water off to see if it is a small water leak.

Water purged, no change in vacuum.

IEVAP2:RV1 was closed. After opening, normal vacuum behavior recovered. The valve is automatically closing when reaching 100Torr. Wasn't doing that before. Turbo on now.

2020-08-07 9:24am pumping over night, vacuum at 8e-7torr. Everything ready for test. Ramping up target heater.Up to 50A 1A/20s

2020-08-07 9:48am all good at 50A, ramping to 250 1A/10s

2020-08-07 10:27am all good at 250A, ramping to 400 1A/10s

2020-08-07 10:57am all good at 400A, ramping to 500 1A/10s

2020-08-07 11:17am Tc type C might have been deatached at 500A, ramping to 600 1A/10s

2020-08-07 11:37am All good, ramping to 700 1A/10s

2020-08-07 11:58am 1950degC on pyrometer, 1200degC on type C TC (probably not well attached anymore), TCs on heatshield [30-40]degC. Pressure 9e-6Torr

2020-08-07 12:44pm All values stable after 45min, starting to ramp up parasitic target heating elements.

2020-08-07 1:15pm Open circuit, would seem that one of the heating elements cracked. Cooling down the target.

The target was prepared and put under vacuum on 2020-08-10

2020-08-11 10:16am The pressure is 1e-6Torr. Leak checked performed, water on no problem. Starting to set target heating curve. 1A/10s up to 300A 

2020-08-11 11:23am target at 300A-1200degC Temperatures on exposed foil show to be higher than expected. 300degC already, 70degC on covered by foil thermocouple. Putting 50 more amps at 1A/10s 

2020-08-11 12:11pm target at 350A-1340degC. 350degC on exposed thermocouple. Ramping to 400A 1A/10s.

2020-08-11 12:28pm target at 400A-1420degC. 400degC on exposed thermocouple. Ramping to 450A 1A/10s.

 Short oven loaded with additional hardware are spacers into the flex-line HS.

A Ta short tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in both sides of the Ta tube, the caps weren't sealed.

The tube was set in the EVAP2 

Wednesday, August 12, 2020, 11:48: Electrical check in EVAP 2:

Target to HS @ 563V 

Leg to leg above bracket

TGHT A @ 10A: 1.332 mOhm

TGHT B @ 10A: 1.300 mOhm

Leg to leg w/ bracket

TGHT A @ 10A: 1.490 mOhm

TGHT B @ 10A: 1.491 mOhm

Wednesday, August 12, 2020, 12:08: Roughing.

Wednesday, August 12, 2020, 2:08: Turbo.

Thursday, August 13, 2020, 09:14

 IGP1 = 7.9e-7 Torr

A leak check was performed, no leak detected.

 TGHT power supply on.

Thursday, August 13, 2020, 10:03

IGP1 = 7.7e-7 Torr.

The current was tapped to 50 A 

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Thursday, August 13, 2020, 10:47

Autoramp reached 200 A

TGHT =  200.25 A, 2.38 V

IGP1 = 1.58e-6 Torr

 Thursday, August 13, 2020, 11:07

TGHT =  200.25 A, 2.38 V

IGP1 = 9.66e-7 Torr

Target is shinning dimly

Omega reads 1033 +-50 degC

ARIEL pyrometer is installed in the back of the EVA2 to measured the body temperature of the oven

Thursday, August 13, 2020, 15:30

The connection of the pyrometer with the software was not possible to establish and delay the ramp up of the oven

Friday, August 14, 2020, 10:47

Restarting experiment, 

IGP1 =  4.24e-7 Torr

TGHT = 0 A, ) V, (TGHT was ramped down)

Autoramp set to 1 A each 10 s to 200 A

Good vaccum 3e-5 Torr

Bad vacuum 5e-5 torr

Friday, August 14, 2020, 11:48

Target is shinning dimly

Omega reads 1033 +-50 degC

Autoramp set to 1 A each 10 s to 250 A

Autoramp set to 5 A each 60 s to 450 A

Friday, August 14, 2020, 13:51

TGHT = 6.46 V, 450.13 A

IGP1 = 2.32e-6 Torr

Omega = 1931 °C (slope 0.99)

ARIEL pyrometer = 1504.5 °C (slope 0.929)

Friday, August 14, 2020, 14:06

Autoramp = 5A each 2 min until 500 

Autoranp stopped at 475 A (EPICS TGHT = 6.87V, 476.663A)

Omega = 2013 °C

ARIEL pyrometer = 1547 °C

Friday, August 14, 2020, 17:34

Autoramp is set to  5A each 2 min until 500 

TGHT = 7.403 V, 500.006 A, 

omega = 2104 C

AP= 1586 C

Friday, August 14, 2020, 17:49

Autoramp  is set to  5A each 2 min until 550 

Autoramp stopped by itself at 545 A instead of 550 A

TGHT = 8.11V, 547.65A, 

omega = 2214C

AP= 1656.8 C

IGP1=6.8e-6 Torr

Friday, August 14, 2020, 18:13

 Autoramp  is set to  10A each 2 min until 600

Friday, August 14, 2020, 21:42

TGHT = 9.213 V, 597.8 A,

IGP1 3.27e-6 Torr

Omega =  2380 °C

Ramping down at 5 A per min to 475 A

Monday, August 17, 2020, 09:02

TGHT =  6.741 V, 471.6 A,

IGP1 = 3.46e-7 Torr

Omega = 2052 6°C 

Proceeded to ramp down at  5 A per min to 0 A