Wednesday, February 13, 2019, 10:04

A previously coated tantalum tube with 3 layers of shielding (Details in e-log 426) was loaded with a graphite insert. 

The tube was loaded in evaporator 2 and pumped down

The graphite insert will be heated to 2000 C for 1 week

IGP1=1.37e-07 Torr

 Wednesday, February 13, 2019, 10:27

IGP1= 1.46e-07 Torr

Manual tapping to 40A on TGHT

TGHT 40.7A, 0.104V

Autoramp started at 1A/min up to 400 A

Good Vacuum = 3.00e-05, Bad Vacuum = 5.00e-05

 Thursday, February 14, 2019, 08:42

IGP1= 2.2e-07 Torr, T=1705 C, TGHT 401A, 6.7 V

Manually tapping to 2000 C (Slow ~1 A/min) in 5 A increments followed by waiting for equillibrium

Thursday, February 14, 2019, 10:54

IGP1 = 1.4e-06 Torr, T = 2003 C, TGHT 500A, 9.1 V

Waiting for equillibrium

manually tapped TGHT to 503A,  T = 2003 C

Will leave for 1 week

Wednesday, February 20, 2019, 08:44

 IGP1= 1.37e-07 Torr, T=1943 C, THGT= 503 A, 8.9 V

Ramp-down @ 2A/min

Wednesday, February 20, 2019, 14:02  

1 hour since TGHT = 0 A

Venting will proceed.

 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, October 25, 2018, 10:36

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).

Chamber is currently being pumped down

 Friday, October 26, 2018, 08:40

Pressure at IGP1 1.06e-6 Torr. 

Tapped up TGHT and TBHT manually to 40 A

Waited 1 hr for vacuum to stabilize.

IGP1 = 8.9e-6 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

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

Initiating auto ramp for TBHT @ 0.5 A/min to a max setpoint of 230 A

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

 Friday, October 26, 2018, 10:46

At 62 A, the vacuum overpassed the "Bad vacuum " limit and the current reduced to 54 A.

when the pressure returned to the "Good vac" limit the ramping started automatically.

Friday, October 26, 2018, 16:59

TGHT= 450 A, Temperature = 1878 C

Ramping rate increased to 1A/min for the TBHT.

Tapped manually to 454 A, Temperature 1880 C.

Saturday, October 27 2018, 10:00 

Ramping down to 0 A @ 2 A/min.

Monday, October 29, 2018, 12:39

 Venting EVAP2, TaC coat sintering completed.

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.

Tuesday, July 30, 2019, 15:33

ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs).

Total weight= 470 g.

20 Analysis discs weighing 2.368 g (10 at each end).

Two springs (one at each end).

OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434

Target is being pumped down.

Wednesday, July 31, 2019, 09:31

Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434)

TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A.

Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each.

IGP1= 1.35e-06 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Wednesday, July 31, 2019, 12:02

At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min). 

Thursday, August 01, 2019, 08:42

TGHT = 54.7

TBHT = 54.3

IGP1 = 3.86e-5 Torr

Will changer heat ramp to .1A/min by changing wait interval to 60s

Tuesday, August 06, 2019, 07:14

OMEGA = 1212 C

TGHT = 344.7 A, 5.79 V

TBHT = 233 A, 4.17 V

IGP1 = 1.05 e-06 Torr

Autoramping to 400A at increments of 0.1A/min

Tuesday, August 06, 2019, 09:50

OMEGA = 1233 C

TGHT = 360 A, 6.05 V

TBHT = 233 A, 4.18 V

IGP1 = 1.21 e-06 Torr

increasing autoramp increments to .5A/min

Tuesday, August 06, 2019, 12:27

OMEGA = 1356 C

TGHT = 400.6 A, 6.92 V

TBHT = 233.8 A, 4.20 V

IGP1 = 1.95 e-06 Torr

Autoramping to 430 A on TGHT at 0.5 A/min

Tuesday, August 06, 2019, 14:02

OMEGA = 1447 C

TGHT= 430.9 A, 7.66V

TBHT = 233.2A, 4.2 V

IGP1= 2.01e-06 Torr

Autoramping to 440 A on TGHT at 0.5 A/min

Wednesday, August 07, 2019, 09:10

OMEGA = 1548

TGHT = 441.56 A, 8.2 V

TBHT = 233.3 A, 4.2 V

IGP1 = 6.21e-07 Torr

Manually ramping up to 1900C @ 1A/min

Wednesday, August 07, 2019, 09:43

Changed OMEGA slope to 1.09 as per eLog #434

OMEGA reads 1773 C @ TGHT 451A, 8.4V

IGP1 = 7.02 e-07

Wednesday, August 07, 2019, 10:56

OMEGA = 1903 C

TGHT = 483.5 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 1.7 e-06 Torr trending down

Wednesday, August 07, 2019, 11:40

OMEGA = 1914 C

TGHT = 483.5 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.5 e-06 Torr trending down

Decrease TGHT current to 480.4 A

Wednesday, August 07, 2019, 13:04

OMEGA = 1918 C

TGHT = 480.3 A, 9.4V

TBHT = 233.3 A, 4.3V

IGP1 = 1.28e-06 Torr

Decrease TGHT current to 474.5 A

Wednesday, August 07, 2019, 13:26

OMEGA = 1904 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.11e-06 Torr

Wednesday, August 07, 2019, 13:47

OMEGA = 1912 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.10e-06 Torr

Decrease TGHT to 471.8 A

OMEGA temperature went down to 1904 C

Wednesday, August 07, 2019, 14:26

OMEGA = 1911 C

TGHT = 471.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.00e-06 Torr

Decrease TGHT to 469.0 A

OMEGA temperature down to 1904C

Wednesday, August 07, 2019, 15:45

OMEGA = 1912 C

TGHT = 468.8.8 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 9.2e-07 Torr

Decrease TGHT to 466.0 A

OMEGA temperature down to 1903C

Wednesday, August 07, 2019, 22:09

OMEGA = 1924 C

TGHT = 466.8. A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 7.6e-07 Torr

Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V

OMEGA = 1900 C

Will allow Pressure to stabilize

 Thursday, August 08, 2019, 06:54

OMEGA = 1919 C

TGHT = 456.9 A, 9.1V

TBHT = 230.3 A, 4.2 V

IGP1 =5.7e-07 Torr

Cooling at 2A/min TGHT and 1A/min TBHT

Thursday, August 08, 2019, 13:30

Target removed from Evap2.  Awaiting inspection by John.

Darwin Ortiz Rosales wrote:

Tuesday, July 30, 2019, 15:33 ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs). Total weight= 470 g. 20 Analysis discs weighing 2.368 g (10 at each end). Two springs (one at each end). OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434 Target is being pumped down. Wednesday, July 31, 2019, 09:31 Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434) TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A. Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each. IGP1= 1.35e-06 Torr Good vac at 3.00-5 Torr Bad vac at 5.0e-5 Torr. Wednesday, July 31, 2019, 12:02 At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min).  Thursday, August 01, 2019, 08:42 TGHT = 54.7 TBHT = 54.3 IGP1 = 3.86e-5 Torr Will changer heat ramp to .1A/min by changing wait interval to 60s Tuesday, August 06, 2019, 07:14 OMEGA = 1212 C TGHT = 344.7 A, 5.79 V TBHT = 233 A, 4.17 V IGP1 = 1.05 e-06 Torr Autoramping to 400A at increments of 0.1A/min Tuesday, August 06, 2019, 09:50 OMEGA = 1233 C TGHT = 360 A, 6.05 V TBHT = 233 A, 4.18 V IGP1 = 1.21 e-06 Torr increasing autoramp increments to .5A/min Tuesday, August 06, 2019, 12:27 OMEGA = 1356 C TGHT = 400.6 A, 6.92 V TBHT = 233.8 A, 4.20 V IGP1 = 1.95 e-06 Torr Autoramping to 430 A on TGHT at 0.5 A/min Tuesday, August 06, 2019, 14:02 OMEGA = 1447 C TGHT= 430.9 A, 7.66V TBHT = 233.2A, 4.2 V IGP1= 2.01e-06 Torr Autoramping to 440 A on TGHT at 0.5 A/min Wednesday, August 07, 2019, 09:10 OMEGA = 1548 TGHT = 441.56 A, 8.2 V TBHT = 233.3 A, 4.2 V IGP1 = 6.21e-07 Torr Manually ramping up to 1900C @ 1A/min Wednesday, August 07, 2019, 09:43 Changed OMEGA slope to 1.09 as per eLog #434 OMEGA reads 1773 C @ TGHT 451A, 8.4V IGP1 = 7.02 e-07 Wednesday, August 07, 2019, 10:56 OMEGA = 1903 C TGHT = 483.5 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 1.7 e-06 Torr trending down Wednesday, August 07, 2019, 11:40 OMEGA = 1914 C TGHT = 483.5 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.5 e-06 Torr trending down Decrease TGHT current to 480.4 A Wednesday, August 07, 2019, 13:04 OMEGA = 1918 C TGHT = 480.3 A, 9.4V TBHT = 233.3 A, 4.3V IGP1 = 1.28e-06 Torr Decrease TGHT current to 474.5 A Wednesday, August 07, 2019, 13:26 OMEGA = 1904 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.11e-06 Torr Wednesday, August 07, 2019, 13:47 OMEGA = 1912 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.10e-06 Torr Decrease TGHT to 471.8 A OMEGA temperature went down to 1904 C Wednesday, August 07, 2019, 14:26 OMEGA = 1911 C TGHT = 471.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.00e-06 Torr Decrease TGHT to 469.0 A OMEGA temperature down to 1904C Wednesday, August 07, 2019, 15:45 OMEGA = 1912 C TGHT = 468.8.8 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 9.2e-07 Torr Decrease TGHT to 466.0 A OMEGA temperature down to 1903C   Wednesday, August 07, 2019, 22:09 OMEGA = 1924 C TGHT = 466.8. A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 7.6e-07 Torr Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V OMEGA = 1900 C Will allow Pressure to stabilize    Thursday, August 08, 2019, 06:54 OMEGA = 1919 C TGHT = 456.9 A, 9.1V TBHT = 230.3 A, 4.2 V IGP1 =5.7e-07 Torr Cooling at 2A/min TGHT and 1A/min TBHT Thursday, August 08, 2019, 13:30 Target removed from Evap2.  Awaiting inspection by John.

 Monday, August 12, 2019, 15:45

Visual inspection on the target was performed today.  See attachment for details.

Target container is slightly bent, and some visible crystallization on the container surface.  

The discs are nicely packed with only a slight expansion in length was measured.

No clogging inside the container nor the ionizer tube. 

Some sintered discs samples were collected and SEM will be perform later. 

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.  

Monday, March 18, 2019, 15:51

Total number of foils: 555

Total mass of material including graphite foils: 478 grams

Total length packed 14.2 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end to allow for ZrC expansion.

5 extra foils tucked beneath each spring for QC; total mass (10 discs) =1.0160 g

Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 280A A (Omega slope set = 0.990, approx 1400 C, Elog#427),  TGHT will be tapped up accordingly to reach desired temperature. 

TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Currently being pumped down.

 Tuesday, March 19, 2019, 08:57

Current pressure IGP1 = 5.24e-07 Torr

Manually tapping to 40A on TBHT and TGHT

At 20 A IGP1 pressure trending up.  Will leave at 20A until trending down.

Pressure @ 20 A set, peaked ~1.8e-06 Torr after 1 hour

Tuesday, March 19, 2019, 10:32

Tapping manually to 50 A on TBHT and TGHT while monitoring IGP1 pressure

Tapped to 25 A and IGP1 pressure trending up.  Will allow to stabilize.

Tuesday, March 19, 2019, 11:34

Pressure stabilized at ~3.25e-06 Torr

Tapped up to 30 A on both TGHT and TBHT

Pressure stabilized at ~6.6e-06

Tapped up to 34A on both TGHT and TBHT

Pressure stabilized at ~1.2e-05 Will allow to drop before proceeding

 Tuesday, March 19, 2019, 13:43

Tapped up to 40A waiting for pressure to stabilize

Pressure shot up ~8.5e-05, therefore tapped down TGHT to 35A (At 35A TGHT current value fluctuates, probably better to ramp up to 36A)

Will let pressure drop before proceeding with TGHT heating

Ramped TGHT to 36A, IGP1 pressure still trending down and current measurements stable.

 Starting autoramp at 0.3A/min for both TGHT and TBHT until 280A and 230A respectively

Initial TGHT Current: 33.6A, 0.05V

Initial TBHT Current: 38.6A, 0.48V

IGP1 = 4.9e-05 Torr

Wednesday, March 20, 2019, 09:41

 TGHT has only ramped to 45.7 A, 0.085V

TBHT has only ramped to 50.2A, 0.62V

IGPI pressure ~4.0 e-5 Torr

Stopping ramp and monitoring pressure to see if it drops appropriate levels.

Wednesday, March 20, 2019, 14:10  

IGP1 pressure = 7.6e-06 Torr

TGHT 47.7Z, 0.16V

TBHT 50.1A, 0.63V

Autoramp at 0.1A/min both TGHT and TBHT to 280A and 230A respectively.

 Thursday, March 21, 2019, 08:12

IGP1 = 3.1e-05 Torr

TGHT = 51.4 A, 0.18V

TBHT=61.9A, 0.87V

Stopped autoramp

Manually ramping TGHT and TBHT while monitoring pressure

 Rampted up TGHT to 54A (reading 65 A), 0.5V and TBHT to 68A, 0.9V

Allowing pressure to stabilize

Manually tapped TGHT to 80A, .81V

Manually tapped TBHT to 90A, 1.3V

IGP1 = .0002 Torr

Will leave over night to allow pressure to drop

Friday, March 22, 2019, 08:17

IGP1 = 6.6e-06

TGHT = 88.8A, 0.81V

TBHT = 90.1A, 1.3V

Will manually tap ~100A on both TBHT and TGHT

Friday, March 22, 2019, 12:18

IGP1 = 1.28e-05 Torr

TGHT = 100.9A, 1.0V

TBHT = 101.2A, 1.5V

will allow pressure to drop slightly the autoramp at 0.1A/min for both TGHT and TBHT until 280A and 230A respectively

Friday, March 22, 2019, 14:51

IGP1= 7.4 e-06 Torr

TGHT = 100.8A, 1.0V

TBHT= 101.5A, 1.5V

Started autoramp at 0.1A/min for both TGHT and TBHT until 280A and 230A respectively

Tuesday, March 26, 2019, 08:18

IGP1 oscillated around ramping trip point 3.0e-05 while current slowly ramped to 280A (reached sometime during the night).

IGP1= 7.8e-06 Torr

TGHT= 283.4A, 4.2V

TBHT= 233.1A, 4.1V

Will continue ramp TGHT @0.2A/min up to 400A  (Omega slope set = 0.990, approx 1800 C, Elog#427)

Wednesday, March 27, 2019, 09:39

Target has been at 400A, OMEGA ~1400C since ~7pm of previous evening

TGHT = 400.2A, 6.45V

TBHT= 233.1A, 4.16V

IGP1= 3.1e-07 Torr

Autoramp TGHT to440A @0.2A/min

 Stopped autoramp at TGHT = 427.4 A and 7.00V, OMEGA= 1492 C

Wednesday, March 27, 2019, 14:14

Restarted TGHT autoramp @.2A/min up to 440A

Friday, March 29, 2019, 12:06

Changed OMEGA slope to 1.09 after checking with the analog pyrometer

IGP1 = 1.65e-07 Torr

TGHT = 441.3A, 7.5V

TBHT= 233.0A, 4.2V

Tapping TGHT to 450A @ ~1A/min while monitoring pressure

TGHT remained at 451A, 7.8 V  and  TBHT at 233.2A, 4.2 V,  for 10.5 hours while OMEGA Temperature ~1810 C.

Ramp-down was initiated with IGP1 = 1.7e-07 Torr

Ramp rate = 2A/min for TGHT and 1/min for TBHT

 Monday, April 01, 2019, 08:53

TGHT = 0A, 0.05V

TBHT= 0.01A, 0V

IGP1= 4.05e-08 Torr

Unloading Target

Target Final weight = 473 g

% Mass of ZrC+C+organics lost = 14.20 % compared to 13.95% theoretical organics content.

Final weight of 10 discs = 0.9250 g

% mass lost on this discs = 13.66%

The tube was slightly bent along the short axis

The discs expanded but more towards one side (possibly due to discrepancy in spring strength).

 One protective graphite disc added to each end

One end cap on each end

Ta#58 LP-SIS target description:

Total Ta foils = 470 [6x20 packs + 350 single discs]

Foil Thickness = 0.025mm

Target density =  14.16 g/cm3

Target length = 3.4 cm

Total Mass =  48.138 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  464 g

Discs in target are arranged as follows: 1pack / 75singles / 1pack / 100singles / 2packs / 100singles / 1pack / 75singles / 1pack

End caps installed (not yet expanded). No Ta heat shield added.

Tuesday, April 23, 2019, 13:54: Roughing. 

Tuesday, April 23, 2019, 14:01: Turbo pump started. 

Tuesday, April 23, 2019, 14:09: Turbo pump at speed. 

TBHT will be ramped up to 230A at 1.0A/min.

TGHT will be ramped up to 650A at 2.0A/min.

Final desired temperature = 1900C.

OMEGA slope = 0.98.

Wednesday, April 24, 2019, 08:38: Power / sources on. 

Wednesday, April 24, 2019, 08:43: TGHT manually to 40A. Vacuum @ 1.87e-07T.

Wednesday, April 24, 2019, 08:45: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 350 / 180 A. 

Slope found / set. Slope = 0.98. Laser on target, OK.

Wednesday, April 24, 2019, 11:58: Vacuum @ 4.45e-07T. Temp @ 1120 deg C. TGHT / TBHT @ 350 / 180 A.

Wednesday, April 24, 2019, 12:02: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 650 / 230 A.   

Wednesday, April 24, 2019, 14:27: Halted auto ramping briefly. Set auto-ramping TGHT @ 2 A per min to 630 A .

Wednesday, April 24, 2019, 14:32:  TGHT / TBHT @ 630 (627.9) / 230 (233.3) A.

Vacuum @ 1.15e-06T. Temp @ 1840 deg C. Hold.

Thursday, April 25, 2019, 06:59: Vacuum @ 2.74e-07T. Temp @ 1860 deg C. Hold. 

Thursday, April 25, 2019, 08:05: Auto-ramping TGHT @ 2 A per min to 640 A.

Thursday, April 25, 2019, 08:13: TGHT / TBHT @ 640 (636.9) / 230 (233.16) A.

Vacuum @ 9.96e-07T. Temp @ 1878 deg C.

Thursday, April 25, 2019, 08:15: Auto-ramping TGHT @ 2 A per min to 645 A.  

Thursday, April 25, 2019, 08:20: Auto-ramping TGHT @ 2 A per min to 650 A.   

Thursday, April 25, 2019, 08:24: Vacuum @ 9.96e-07T. TGHT / TBHT 653 (650.3) / 230 (233.16) A. TGHT Voltage= 12.760V. Omega: 1902-1903 deg C. Desired temperature = 1900C reached. 

Thursday, April 25, 2019, 14:00: Begin auto-cooling TGHT / TBHT @ -2 / -1 A per min.

Friday, April 26, 2019, 10:29: Power/heaters off. Turbo pumps off. 

Friday, April 26, 2019, 10:42: Venting. 

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.

Monday, August 20, 2018, 17:58

14.9 g of np-SiC fibrous target discs are loaded into the container (previously coated with TaC and sintered, see elog ID 414).

Total loaded length 9.5 cm. 

A 1.5" width graphite sheet is used as under layer to prevent TaC diffused to the discs; this was observed during the heat treatment, (see dropbox SEM images).

Both end caps are in.  With ionizer pointing out, right cap is expended BUT NOT left cap - will need to expend this after the conditioning.

No Ta heat-shield is used.

Final conditioning temperature:  1500 C (As per e-log 414, TGHT = 450A/7.31V, 3.28kW) 

Keeping TBHT at 0A for now - will ramp up after TGHT reach to the desired temperature. 

OMEGA slope set at 0.99

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

 Tuesday, August 21, 2018, 10:24

Pressure at 1.2e-6 Torr. 

Initiated autoramping at 2A/min for TGHT to reach 400A - monitoring temp and vacuum.

TBHT set at 10A. 

 Tuesday, August 21, 2018, 15:13

Temp reached to 1350C. TGHT at 400A/6.7V. Pressure at 1.9e-6 Torr after holding at the temp for 100 min.

 Tuesday, August 21, 2018, 15:28

Tapped up TGHT to 450A/7.8V (3.5kW).  Temp measured at 1465 +/- 5 C.  Pressure coming down from 3.5 e-6 Torr.

 Tuesday, August 21, 2018, 15:32

Tapping up TBHT to 230A

 Tuesday, August 21, 2018, 16:25

TBHT at 230A/4.33V.  Pressure started to increase from 150A, and reached to 3.3e-6 Torr after TGHT reached to the setting.

Temperature measured at 1475 C +/- 5C.  Holding at this temperature until vacuum comes to stabilization (est.2-3 hours)

 Tuesday, August 21, 2018, 16:45

Checked with Mikron (slope set at 0.99); temp on left end-cap measured at 1490 +/- 20C (that's close enough).  Temp on ionizer tube about 1900C

 Tuesday, August 21, 2018, 22:12

Pressure at 1.7e-6 Torr.  Temp holding at 1480C, TGHT at 450/7.7V, TBHT 230A/4.27V.

Cooling down at 2A/min for TGHT and 1A/min for TBHT

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, June 24, 2019, 08:24

Total number of foils: 484

Total mass in  including container = 1495 grams

Total length packed 17.28 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end.

Initially will heat via autoramp to OMEGA 1400 C , ramping TGHT at  0.1 A/min to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correction to 1800C) 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 700A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).  TBHT at 0.1 A/min.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

System was pumped down on Friday June 24th, 2019.

IGP1= 3.3 e-07 Torr

(EPICS was down this morning and came back up around 930 a.m.)

Will proceed to manually tap up TGHT and TBHT to 40A as soon as EPICS stability confirmed

Mondayy, June 24, 2019, 15:30

TBHT = 39 A, 0.4V

TGHT=40 A, 0.1V

IGP1= 4.3 e-06 Torr and trending down

Autoramp increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

Tuesday, June 25, 2019, 08:40

Current has only increased to 53 A and pressure limit reached.  Lowered current back to 51 A on TGHT and TBHT.  Waiting for pressure to stabilize.

Tuesday, June 25, 2019, 12:16

TGHT 51.3 A, 0.39 V

TBHT 51.1 A, 0.58 V

IGP1 = 1.91 e-05 Torr

Starting autoramp with  increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

 Saturday, June 29, 2019, 22:45

Autoramp increments for TGHT set to 0.2 A/min

 IGP1=2.4 e-06 Torr

 Sunday, June 30, 2019, 07:46

Autoramp incrementsTGHT set to 0.1 A/min to prevent pressure spike. 

IGP1= 1.5 e-05 Torr

 Sunday, June 30, 2019, 08:26

Set autoramp increments on TGHT back to 0.2 A/min

Sunday, June 30, 2019, 15:47

Set autoramp max on TGHT to 500 A

Sunday, June 30, 2019, 21:15

OMEGA = 1240C

TGHT= 465A, 7.0V

TBHT = 233A, 3.2V

IGP1= 1.6 e-05 Torr

Set autoramp max on TGHT to 600A

Monday, July 01, 2019, 09:48

OMEGA = 1605 C

TGHT = 599A, 9.7V

TBHT = 233A, 3.2V

IGP1= 1.3 e-06 Torr

Set autoramp max on TGHT to 650A

Monday, July 01, 2019, 18:21

OMEGA = 1630 C

TGHT = 650 A, 10.6V

TBHT = 233A, 3.2V

IGP1 = 9.7 e-07 Torr

Set utoramp max on TGHT to 700A

Monday, July 01, 2019, 22:07

OMEGA = 1663 C

TGHT = 682A, 11.4V

TBHT = 233A, 3.2V

IGP1= 1.5 e-06 Torr

Set autoramp max on TGHT to 730A

Tuesday, July 02, 2019, 08:15

OMEGA =1700 C

TGHT = 730A, 12.0V

TBHT = 233A, 3.2V

IGP1= 1.1 e-06 Torr

Set autoramp max on TGHT to 750A and increments to 0.4A/min

Tuesday, July 02, 2019, 09:49

Temperature on OMEGA began dropping.  Changed OMEGA slope to 1.09 (Elog 371) and temperature reading = 1884 C.  Aborted autoramp and lowered TGHT current to 740A.

Tuesday, July 02, 2019, 12:14

Temperature and pressure have dropped at a consistent rate. 

IGP1= 9.6 e-07 Torr

OMEGA = 1715 C

Will tap up manually to 750A on TGHT

No appreciable increase in pressure will tap back down to 745A on TGHT

Tuesday, July 02, 2019, 13:11

OMEGA = 1675 C

TGHT = 745A, 12.4V

TBHT = 233A, 3.2V

IGP1 = 1.03 e-06Torr

 Will start to ramp- down TGHT @ -2.0A/min

OMEGA = 1354 C

TGHT = 495A, 7.01V

TBHT = 233.2A, 3.2V

IGP1= 2.2 e-07 Torr

Continue ramp-down TGHT @ -2.0A/min

Tuesday, July 02, 2019, 17:14

TGHT = 285.5A, 3.4V

TBHT = 232A, 3.1V

IGP1= 1.4 e-07 Torr

Start TBHT ramp-down at -1.0 A/min

Wednesday, July 03, 2019, 08:37

Turned off TGHT and TBHT

IGP1 = 7.8 e-08 Torr

Wednesday, July 03, 2019, 13:18

Final total weight of Target = 1489.5 g

Removed 18 discs after weighing.

12.3

Saturday, November 23, 2019, 14:00

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 was started on Friday November 22; however.

No leaks were observed when turning water lines on.

IGP1= 4.6e-07 Torr

 Saturday, November 23, 2019, 15:30

autoramp at 0.5A /min up to 50A for both TGHT and TBHT and maintained for 1 hour.

Saturday, November 23, 2019, 16:15

IGP1= 1.1e-06 Torr

Auto Ramp to 450 A on THGT and 230A on TBHT at 0.5A/min

Saturday, November 23, 2019, 23:44

IGP1= 5.2e-06 Torr

TGHT = 248A, 2.9V  TBHT= 233A 2.9V

Increased ramp step to 1A/min to 620 A

Sunday, November 24, 2019, 00:14

IGP1=1.9e-06 Torr

TGHT = 274.3, 3.3V   TBHT= 233A, 2.9V

Sunday, November 24, 2019, 07:33

IGP1=3.2e-06 Torr

OMEGA= 1490C

TGHT = 619 A, 9.1V   TBHT=233A, 2.9V

Continue ramping THGT at 1A/min to 700 A

Sunday, November 24, 2019, 10:05

IGP1= 2.1 e-05 Torr

OMEGA= 1676 C

TGHT= 700A, 10.6V   TBHT= 233A, 2.0V

Start autoramp to 780A as per regression in attachment

Sunday, November 24, 2019, 13:22

Autoramp to 795A  for TGHT

Sunday, November 24, 2019, 21:16

OMEGA= 1854 C

TGHT= 789.6A, 12.27V  TBHT= 233.A, 2.9V

IGP1= 2.0e-05

Will allow pressure to stabilize lower.

Sunday, November 24, 2019, 22:16

TGHTT= 789.6A, 12.3V TBHT=233.3A, 2.9V

OMEGA=1855C

IGP1 = 6.9e-06Torr

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

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.

This morning, the vacuum responded to shutting of the water of the heat shield circuit (leak rate without pumping leveling out). The vacuum chamber was vented and the heat shield with flexible lines was replaced with another heat shield with fixed lines. The chamber was again pumped down and water opened at ~150 mTorr to test the leak up rate without pumping. No leaks apparent, so continued pumping down with turbo pump. At a vacuum of about 1E-6 Torr the water was again supplied to the heat shield circuit and an increase in vacuum could be observed. Stopped the turbo pump and prepared to vent. Two new heat shield lines were brazed in the machine shop and fitted by Maico after lunch. During this time one of the old lines (from heat shield to feedthrough in box) was leak tested and a leak found at a location just above the VCR. The line had been twisted and due to the twist developed a leak. With the two lines replaced, the vacuum was pumped down again and water could be supplied without any increase in vacuum pressure at 1E-6 Torr. To facilitate the new copper tubing, the restraining bracket for the heat shield VCRs was not mounted. It will have to be fitted later. Until then, please contact Anders for help in removing the heat shield to prevent any damage to the new lines.

Darwin Ortiz Rosales wrote:

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= 1900 C (Correction = 1800 C, NOT 1900 - JW), Omega Slope set = 0.990 (use 1.08, check temp, JW), manually and automatically ramp to 700A (check temp to see if it's matching with the 1.08 slope), 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, 17:44

I'll take over from here to step up the target heater, and I'll coordinate it with Darwin. 

 Wednesday, November 27, 2019, 20:36

Note: Sintering temp should be at 1800 C, NOT 1900.  Use Omega slope 1.08 and check temperature.  Correction made on elog #471.

Continue to step up TGHT and TBHT, keeping vacuum below 1.5 e-5 Torr. 

 Thursday, November 28, 2019, 03:06

TGHT reached to 400A/5.29V, TBHT at 230A/3.13V. 

Vacuum coming down from 1.3 e-5 Torr.

OMEGA = 1105 C (slope at 0.99).

Instructions for Darwin:

1.  Confirm temperature - check the temp plot from the TaC coating step. 

2.  Change OMEGA slop to 1.08 - check to see if this matches the temp plot.  If not, bring it back to 0.99.

3.  Continue to step up TGHT, check temp at 1400C (change slop 1.08 and check), 1500 C, 1600 C (check windows for coating - if any coating, then OMEGA is no longer useful hereon)

4.  Use the temp plot and continue to tap up TGHT to reach 1800 C and hold it for at least 4 hours or until the vacuum goes below 1 e-6 Torr then proceed with cooling down.

5.  Use the auto cooling program for TGHT (-2A/min) and TBHT (-1A/min)

Note:  For ramping up TGHT, keep vacuum below 1.5 e-4 Torr and keep tapping up to reach 1800 C.  Above 1100 C, this should be a quick step to get to 1800 C; should take < 2 hrs to get there.  

See the striptool or the attachment below to see how I did it. 

Once the chamber is cool down, take out a few samples for SEM analysis. 

Good luck!

 Wednesday, March 09, 2022, 06:25

Ta HP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (3 layers)

Desired temperature = 1800 C , TBHT will be set fixed at 230A (max).

Evap 2 will be pumped down over previous night

Good vacuum = 3.00 e-4 Torr

Bad vacuum = 5.00 e-2 Torr

IGP1= 1.2 e-06 Torr

Start autoramp @1A/min to 60 A

Wednesday, March 09, 2022, 09:29

 TGHT= 60 A 0.67 V

TBHT = 60A 0.59V

IGP1= 1.77e-6 Torr

autoramp @ 2A/min to 120 A and monitor (both TGHT and TBHT)

Wednesday, March 09, 2022, 10:19

IGP1 was increasing to fast.  Manually lowered current to 105A on both TGHT and TBHT.

Will allow pressure to stabilize

Plant group requested maintenance work for EF12/13

Therefore, keeping system as is until further instructions from plant group.

Thursday, March 10, 2022, 15:18

Will resume ramp up to 120 A for both TGHT and TBHT @ 1A/min

 IGP1= 6.4 e-07 Torr

Thursday, March 10, 2022, 15:30

Increase ramp rate to 2A/min 

Thursday, March 10, 2022, 17:41

@ 245 A TGHT and 230A TBHT ramp back down to 100 A for both as OMEGA not displaying Temperature.  Will need to go in tomorrow to fix OMEGA 

Friday, March 11, 2022, 14:25

Ramping at 2A/min to 230A for both TGHT and TBHT

Friday, March 11, 2022, 15:17

IGP1= 1.23e-6 Torr

Continue Ramping TGHT @ 3A/min to 400 A keep TBHT at 230A

Friday, March 11, 2022, 22:22

@ TGHT 725 A 1800 C was reached on OMEGA

Kept there since 7:20 pm.  Start rampdown at 11:20 pm.

Friday, March 11, 2022, 23:19  

 IGP1= 6.9e-6 Torr

OMEGA= 1805C

TGHT= 725 A, 10.9V

TBHT= 232A, 3.1V

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

Tuesday, June 07, 2022, 07:19

Total number of foils: 403 ( including 5 analysis discs on the right side of the container)

Total weight = 1535.3 g (includes heatshields, spring and T bar)

Total length packed 16.4 cm (excluding 5 analysis discs that will be removed)

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  front (right) side

Initially to ramp TGHT and TBHT to 50A at 3 A/min

then continue to 80A and slow down ramp when pressure begins to increase

max approx 700A 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= 7.6 e-07 Torr at start of initial ramp.

 Tuesday, June 07, 2022, 11:14

Ramping to 150A on TGHT and TBHT at 1A/min

Ramped TGHT and TBHT to 230A at 2A/min

Tuesday, June 07, 2022, 13:12

Ramping TGHT to 600A at 4A/min

TBHT at 230A, 3.0V

Tuesday, June 07, 2022, 16:41

TGHT= 740 A, 12.1V

TBHT= 232A, 3.0 V

OMEGA reading 1616C but questionable.  Will leave for 4 hours at 740A top TGHT.

Wednesday, June 08, 2022, 22:15

Early Wednesday morning the left TGHT bolt was found damaged.  The target leg was coated with bolt material rendering the Target inoperable.   

The Heatshield assembly was swapped and surfaces cleaned.  A "dummy" FEBIAD was installed to test if the system can withstand high current. 

The system was pumped down and ramped to 740A on TGHT at 4A/min.  It was then left at that current for 4 to 5 hours.

Currently starting rampdown at -2A/min to 0A. 

Photos of the incident attached in *eLog 580*.  IGP1= 5.7e-06 Torr

TGHT= 742A, 11.4V

Tuesday, March 09, 2021, 11:54 

 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 increased  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

Wednesday, March 10, 2021, 08:32

IGP1 = 2.6 e -07 Torr

Start autoramp @ 1A/min to 40 A on both TGHT and TBHT

***Autoramp aborted due to work on EF12 affecting EVAP2***

Will have to resume Thursday or Friday

Saturday, March 13, 2021, 7:54

  IGP1= 3.8e-07 Torr

Initiate heating @ 0.5A/min TBHT and TGHT to 60 A

Saturday, March 13, 2021, 23:01

IGP1 = 2.7e-07Torr

TGHT = 60.5A, 0.7V

TBHT= 60.0A, 0.7V

Initiate ramp @ 1 a/min to 400 A on TGHT and 230A on TBHT

Sunday, March 14, 2021, 08:45

IGP1= 8.2e-07 Torr

TGHT = 400A, 5.6V

TBHT = 232.9A, 3.0V 

OMEGA = 1142 C

Continue ramping to 460 A on TGHT at 1a/min

 Sunday, March 14, 2021, 10:11

IGP1 = 1.0 e-06 Torr

TGHT= 460.4 A, 6.5 V

TBHT = 232.9 A, 3.0 V

OMEGA = 1239 C

Will ramp up to 500 A at 1a/min on TGHT

Sunday, March 14, 2021, 10:53

 IGP1 = 1.3 e-06 Torr

TGHT= 495 A, 7.2 V

TBHT = 232.9 A, 3.0 V

OMEGA = 1316 C

Will ramp up to 600 A at 1a/min on TGHT

Sunday, March 14, 2021, 12:45

IGP1 = 3.0 e-06 Torr

TGHT= 604 A, 9.1 V

TBHT = 232.9 A, 3.1 V

OMEGA = 1610 C

Will ramp up to 660 A at 1a/min on TGHT 

Sunday, March 14, 2021, 17:01

IGP1= 2.4e-06 Torr

TGHT =  664 A, 10V

TBHT = 232.9 A, 3.1V

OMEGA = 1733 C

tapping TGHT to 740 A

OMEGA = 1883 C

 Sunday, March 14, 2021, 21:45

IGP1= 3.1e-06 Torr

TGHT =  744A, 11.5V

TBHT = 232.9 A, 3.2V

OMEGA = 1875 C

Start cooling TGHT @-3A/min and TBHT @-1A/min