Thursday, November 22, 2018, 10:12

A previously sintered tantalum tube with 3 layers of shielding was loaded with a graphite insert.

The tube was loaded in evaporator 2 on Wednesday 21/11/2018 and pumped down

The graphite insert will be heated to 2000 C

current pressure IGP1 =  4.2e-7 Torr

TGHT manually tapped to 40 A

Autoramp set to 2 A/min on TGHT to 400 A aiming for 1800 C

 Thursday, November 22, 2018, 17:13

TGHT 401.25 A, 6.79 V

Temperature 1780 C

IGP1 7.89e-7 Torr

Tapping manually to reach 1800 C, final current 407.2 A, 6.96 V

  Friday, November 23, 2018, 17:13

 Tuesday, December 04, 2018, 07:53

TGHT 469.1 A, 8.814 V

Temperature 1983 C

IGP1 1.52e-7 Torr

Wednesday, December 05, 2018, 21:30

 TGHT 469.1 A, 8.75 V

Temperature 1983 C

IGP1 1.22e-7 Torr

Thursday, December 06, 2018, 12:25

 TGHT 468.9 A, 8.66 V

Temperature 1977 C

IGP1 1.42e-7 Torr

Friday, December 07, 2018, 17:59

  TGHT 468.9 A, 8.80 V

Temperature 1977 C

IGP1 1.42e-7 Torr

Wednesday, December 12, 2018, 12:18 

TGHT 469.2 A, 8.7 V

Temperature 1945 C

IGP1 1.10e-7 Torr

Thursday, December 13, 2018, 10:42

TGHT 469 A, 8.7 V

Temperature 1939 C

IGP1 1.04e-7 Torr

Ramping temperature down at -2 A/min

 Friday, December 14, 2018, 10:42

TGHT 0.0 A, 0.051 V

IGP1 4.36e-8 Torr

Thursday, December 20, 2018, 10:24

A tantalum tube was loaded in evaporator 2 on Wednesday 19/Dec/2018.

It is going to be heated to 2000 C during 3 weeks 

Pressure IGP1 =  4.88e-7 Torr

TGHT manually tapped to 40 A

Autoramp set to 2 A/min on TGHT to 400 A aiming for 1800 C

The system tripped due to a power outage.

the current went from 57 to 0 A.

The tube did not show damage signs.

 Wednesday, January 23, 2019, 13:01

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 3 weeks

 Thursday, January 24, 2019, 10:04

Pressure = 3.66e-7 Torr

TGHT manually tapped to 45 A

Final pressure = 3.8e-7 Torr

Set autoramp to 350 A @ 2A/min

TGHT = 1643 C

Set autoramp to 400 A @ 2A/min

TGHT = 1790 C

Started to tapped manually at approx 5 A every 30 s

Final TGHT => 1896 C, 8.16 V, 480.46 A

The current will stay at 480 A until temperature stabilizes. 

The current was reduced to 476 A to stay at 1900 C

Friday, January 25, 2019, 17:16

Pressure = 3.22e-7 Torr

TGHT = 8.17 V, 477.65 A, 1882 C 

Monday, January 28, 2019, 09:09 

Pressure = 1.67e-7 Torr

TGHT = 8.07 V, 477.65 A, 1859 C 

The temperature readings are fluctuating between 1880 and 1859 C

Tuesday, January 29, 2019, 07:32

Pressure = 1.55e-7 Torr

TGHT = 8.17 V, 477.75 A, 1880 C 

Tuesday, January 29, 2019, 11:34

 Pressure = 1.55e-7 Torr

TGHT = 8.27 V, 477.56 A, 1897C 

Tuesday, January 29, 2019, 12:47 

 Pressure = 1.53e-7 Torr

TGHT = 8.19 V, 477.75 A, 1899C 

Tuesday, January 29, 2019, 13:38

 Pressure = 1.55e-7 Torr

TGHT = 8.25 V, 477.75 A, 1905C

Thursday, January 31, 2019, 16:12  

 Pressure = 1.40e-7 Torr

TGHT = 8.4 V, 476.81 A, 1918C

Thursday, January 31, 2019, 22:32

Pressure = 1.39e-7 Torr

TGHT = 8.37 V, 476.71 A, 1914C

The current will be ramped down @1 A/min

Friday, February 01, 2019, 09:58

 Last 22 A tapped to 0 manually

Tantalum tube was removed from the EVAP2

 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.

 Wednesday, March 13, 2019, 15:41

An uncoated tantalum tube was loaded with a graphite insert (with conical caps).

3 tantalum foils were wrapped around the tantalum tube and a Ta cap was added.

EVAP2 is currently pumping down

The tube will be hated for 5 days at 2000 C

Thursday, March 14, 2019, 10:07

IGP1 = 5.37e-7 Torr

The TGHT will be tapped manually to 50 A  

After aprox 1 hour IGP1 = 5.08e-7 Torr, TGHT=46.5 A, 0.224 V

Autoramp is set to 1A/min to 300 A

 Autoramp is set to 1A/min to 450 A

Autoramp was stopped at 425 A when 2000 C were achieved

 Sunday, March 17, 2019, 00:25

IGP1 = 2.03e-7 Torr

TGHT=424.2 A, 7.117 V, temp 1976 C

Sunday, March 17, 2019, 15:04 

IGP1 = 21.6e-7 Torr

TGHT=424.1 A, 7.085 V, temp 1967 C

cooling down -1 A/min

Monday, April 01, 2019, 16:35

Container was coated with TaC and a roll of graphite inserted inside the tube.   A couple of TaC coated Ta springs inside to keep graphite pressed against walls of cylinder.

Container 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.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down.  Sintering will proceed tomorrow.

Tuesday, April 02, 2019, 06:27

IGP1 = 4.37e-7 Torr

Current is manually tapped to 40 A

Tuesday, April 02, 2019, 08:12 

Pressure increased to IGP1 = 1.15e-5 Torr

and it stabilized to IGP1 = 2.32e-6 Torr after ~1.5 hrs

Autoramp is set to 1 A/min to 400 A

Tuesday, April 02, 2019, 08:45

Autoramp stopped momentarily, to stop current reduction

When pressure reduced to ~4e-5Torr, current was tapped manually to 50 A

Autoramp is set again, the conditions are

IGP1 = 2.5e-5 Torr

TGHT = 58.87 A, 0.36 V

Tuesday, April 02, 2019, 09:31

Autoramp stopped momentarily, to avoid current reduction

When pressure reduced, autoramp is set again,

the conditions are:

IGP1 = 2.9e-5 Torr, TGHT = 0.52 V, 71.5 A 

 Tuesday, April 02, 2019, 15:32

 Autoramp stopped momentarily, to avoid current reduction

conditions: IGP1=4.99e-5 Torr, TGHT = 0.78 V, 85.9 A

When pressure reduced, autoramp is set again,

 Tuesday, April 02, 2019, 22:37

Camera conexion was lost

Autoramp reached 400 A

the current was manually raise to 425 A to allow the completation of the process

Wednesday, April 03, 2019, 00:27

Camera connection still off

The current was reduced to 410 A to match with the estimated temperature 

Wednesday, April 03, 2019, 06:56

Camera connection is back, temperature reading is 1786 C

IGP1  5.01e- Torr

TGHT = 6.93 V, 412.22 A

Autoramp was set to -1A/min to 0A

Wednesday, April 03, 2019, 11:01

IGP1 = 1.67e-7 Torr

TGHT = 2.25 V, 179.53 A

Autoramp changed to -2 A/min 

Wednesday, April 03, 2019, 16:54

The tube was removed from the EVAP2,

The coating has a different color than regular coatings, but it doe not seem like the graphite adhered as expected. 

 Sunday, April 07, 2019, 08:10

A graphite insert (with conical caps) was loaded in tantalum tube previously coated with TaC,

and wrapped with 3 tantalum foils,

a tanalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.24e-7 Torr.

The current was tapped to 40 A

Autoramp was set to 1 A/min to 300 A.

At TGHT 335.53 S, 5.28 V the temperature was 1560

The autoramp was set to 450 A.

At TGHT 474.75 S, 7.96 V the temperature was 1560

The autoramp was set to 450 A.

To reach 2000 C, TGHT = 500.25 A, 8.45 V.

After 1hr the temperature stabilized to 1959 C

and the  current was increased to TGHT = 510.28 A, 8.64 V.

After stabilization the temperature reached 2010 C.

The current was decreased to TGHT = 503.15 A, 8.45 V

and the temperature stabilized to 2001 C.

The voltage increased  unexpectedly to 8.89 V and the temperature increased to 2055,

the current was reduced to keep the tube at 2000 C.

The voltage kept increasing and we kept decreasing the current to keep the tube at 2000

The final current before venting and getting out the container was

TGHT = 466.219 A and 8.467 V.

Test result: Broken tantalum tube.

 Tuesday, April 16, 2019, 13:38: Replaced the bottom insert on the heat shield. 

Used small amount of isopropyl alcohol to wipe the inside if the HS out. 

 Wednesday, April 17, 2019, 09:03

An uncoated target container was loaded with a graphite insert and wrapped with 3 tantalum layers,

Two Ta caps were used

EVAP2 was pumped down, IGP1 = 5.14e-7 Torr

 The TGHT and TBHT current was tapped to 40 A manually

Autoramp was set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

The temperature reached 2000 C as planned 

the target container stayed at that temperature for 1 week.

Tuesday, April 23, 2019, 10:00

EVAP2 was vented and the target container was removed.

The container crystalized but did not break.

 Friday, May 10, 2019, 16:54

A tantalum tube was coated with TaC,and wrapped with three tantalum sheets,

the tube was set in the EVAP2 to sinter the TaC coating.

EVAP2 is currently pumping down. 

 Sunday, May 12, 2019, 18:40

IGP1 = 3.01e-7 Torr

Manually tapped current TGHT to 40 A

IGP1 = 4.89e-Torr

at the IGP1 = 1.961e-6 Torr the autoramp was set to 1 A/min to 380 A

IGP1 = 6.91e-7 Torr

TGHT = 6.133 V, 386.8 A, temperature 1682  C

IGP1 = 7.77e-7

TGHT=6.36V, 399A 1730 C

After 4 hours at 1895 C TGHT = 7.435 V and 445.781 A

TGHT was set -2 A/min to 0 A

The EVAP2 was vented with air and the tube was removed

 Tuesday, May 14, 2019, 13:56: Removed old HS w/ flexible lines & swapped in the FEBIAD. (HS waterlines are still purged.) Roughing.

Tuesday, May 14, 2019, 14:06: Turbo pump on. 

Tuesday, May 14, 2019, 14:22: Waterlines opened. Vacuum ok @ 5.34e-05T & dropping. 

Wednesday, May 15, 2019, 06:21

IGP1 = 5.99e-7 Torr,

manually tapping to 40 A.

Autoramp set to 2A/min to TGHT=580 A and TBHT=290 A

Tuesday, May 21, 2019, 08:13

IGP1= 1.43e-7 Torr

TGHT = 580.875 A, 11.22 V

TBHT =  4.45 V, 309.219 A

Temperature 1004 C measured at Ta foil

Ramp-down was initiated with IGP1 = 1.423e-07 Torr

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

EVAP2 was vented with air

 Tuesday, May 21, 2019, 14:20 Test FEBIAD removed - AS.

 Tuesday, May 21, 2019, 14:33: Install flexible line evap 2 HS.

 Tuesday, May 21, 2019, 17:57

A tantalum tube previously coated with TaC and sintered was loaded with graphite foils.

The mass of the foils was 20.04 g.

The system will be heated to 2000 C to find out the corresponding current.

After that the tantalum tube will be trasferred to the EVAP1

and it will be heated there for 5 days. 

EVAP2 currently pumping down

 Thursday, May 23, 2019, 05:48

IGP1 = 2.516e-7 Torr

Manually tap to 50 A

Autoramp set to 1 A/min to 400 A

Thursday, May 23, 2019, 13:09 

IGP1 = 3.78e-6 Torr

TGHT = 6.4 V, 401.3 A

Temperature reading = 1629

Thursday, May 23, 2019, 13:09

Autoramp was set to 550 A at 1 A/min 

Stopped at 530 A

Thursday, May 23, 2019, 21:27

IGP1 = 6.77e-7 Torr

TGHT = 9.2175 V, 507.375 A

After 6 hours at ~2000 C the autoramp was set to -2 A/min to 0 A 

Friday, May 24, 2019, 8:46

EVAP2 was vented with air and the tantalum tube was removed, examined and transferred to EVAP1

Friday, May 24, 2019, 15:26

 A graphite insert with tantalum wires in its caps

was loaded in a tantalum tube, the system will be heated to 2000 C

and after 6 hrs at that temperature, it will be cooled and heated to 2000 C again.

The temperature will be hold at 2000 C for a 6 days.

Currently the chamber is being evacuated.

 Saturday, May 25, 2019, 06:01

IGP1 = 2.2e-7 Torr

Manually tapping to 50 A

Autoramp set to 1 A/min to 400 A

Saturday, May 25, 2019, 13:37

The autoramp was set to 450 A

Then it was manually tappe to 475 A 

Thursday, June 6, 2019, 16:43

A graphite insert with tantalum wires in its caps was loaded in a tantalum tube.

The system will be heated to 2000 C again (see elog 446)

Currently the chamber is being evacuated.

Friday, June 7, 2019, 16:40

Autoramp was set to 450 A at 1A/min to reach 2000 C

The temperature will be hold at 2000 C for a 4 days.

Tuesday, June 11, 2019, 16:46 

Autoramp is set to -2 A/min to 0 A

Wednesday, June 12, 2019, 17:01 

The tube present sever crystallization but is not broken and has some resistance against pressure.

Monday, June 17, 2019, 17:04

A LP-SIS target container  was wrapped with 3 heat shielding layers,

and an empty graphite insert of 17.4 g was introduce in it.

The system was loaded in the EVAP2 and the chamber is currently being evacuated.

The container will be heated to 2000 C in order to correlate the temperature, current and voltage,

as well as to condition the container.

 Tuesday, June 18, 2019, 07:28

The TGHT and TBHT current will be tapped to 40 A manually

Autoramp will be set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

Tuesday, June 18, 2019, 20:51

After 2 hours at ~1800 C the container was cooled,

IGP1 = 1.2e-6 Torr

TGHT = 7.16 V, 447.094 A

TBHT = 4.19 V, 233.43 A

Temperature 1793 C

 Auto ramp TGHT = -2 A/min, TBHT = -1A/min 

Wednesday, August 28, 2019, 06:00

A graphite insert (with conical caps) was loaded in tantalum tube 

the Ta tube was wrapped with 3 tantalum foils,

a tantalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.23e-6 Torr.

The current was tapped to 50 A

Autoramp was set to 1 A/min to 400 A.

 Wednesday, August 28, 2019, 12:02

Autoramp reached 400 A

TGHT = 6.57 V, 404.4 A, IGP1=4.7e-6 Torr

Autoramp was set to 450 A at 1A/min

 Wednesday, August 28, 2019, 12:48

Autoramp reached 450 A

TGHT =7.526 V, 450.188 A, IGP1=5.88e-6 Torr

Autoramp was set to 500 A at 1A/min

Wednesday, August 28, 2019, 13:40

Autoramp reached 500 A, temperature 1880 C

TGHT =8.79 V, 501.094A, IGP1=7.48-6 Torr

Autoramp was set to 540 A at 1A/min 

Wednesday, August 28, 2019, 14:03

The autoramp was stopped at 520 A, because according to previous tests that current is enough to have 2000 C,

the temperature read was 1930 C

TGHT =9.23 V, 520.7 A, IGP1=7.8-6 Torr

Wednesday, August 28, 2019, 15:20

The autoramp was set to 540 A at 1A/min

When the ramp stopped the conditions were:

TGHT=9.59 V, 539.5 A, IGP1= 6.08e-6 Torr

Temperature= 1988 C

Manually tapped to 545 A the temperature reached 2000 C

Wednesday, August 28, 2019, 17:08 

To keep the temperature at 2000 or less the current was decreased,

TGHT= 8.91 V, 445.125 A, IGP1=9.93e-7 Torr

Max temperature read: 2001 C

Min temperature read: 1996 C

Tuesday, September 03, 2019, 11:15

The tube was stable at 1950-1960 C during the weekend but today at around 6 am it had a drop in the current indicating mechanical failure 

The autoramp was set to -2A/min to 0 A. 

The tube will be examined and in case that it is not broken it will be set in the EVAP1 to continue heating it.

Monday, September 09, 2019, 16:35  

The tube became brittle and broke.

Friday, September 06, 2019, 11:20

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

Desired temp=1900 C, Omega slope set =0.990

Chamber pumped down over night and will be initially tapped manually to 40A for both TGHT and TBHT.

Subsequently, current will be automatically ramped up in increments of 1A/min to reach 400A for TGHT and 230A for TBHT.

Then TGHT will be manually tapped to target temperature and allow to stabilize for a minimum of 3 hours.

Good vac at 3.0e-5 Torr

Bad vac at 5.0e-5 Torr

Friday, September 06, 2019, 11:32

IEVAP2:IGP1=9.6e-7 Torr

Tapping to 40A (TGHT and TBHT).

Friday, September 06, 2019, 12:54

Start autoramp

1A/min TGHT and TBHT

IGP1=4.0e-06 Torr

Friday, September 06, 2019, 13:29

TGHT = 70A, TBHT=70A, pressure started to spike rapidly so aborted autoramp and lowered the current to 66A for both TGHT and TBHT.

pressure continued to rise so tapped current to 60A.  A drop observed.  Will allow to stabilize.

Friday, September 06, 2019, 14:06

IGP1=5.3e-06 Torr.  Restart previous ramping. 

At 66A paused ramping.  IPG1= 1.0e-5 Torr

Friday, September 06, 2019, 15:44

IGP1=6.0e-6 Torr

Start modified autoramping: 0.4A/min for TGHT and TBHT.  Will manually tap up in the morning, over ham and eggs. 

Saturday, September 07, 2019, 10:52

 Will tap up to 423 A on TGHT as per attachment #1 regression

IGP1= 1.13e-6 Torr

OMEGA = 1802 C

TGHT= 401.0 A, 6.84V

TBHT=233.6A, 4.1V

Saturday, September 07, 2019, 11:06

Tapped up TGHT to 438A

OMEGA= 1903C

Will monitor and adjust if necessary.

Saturday, September 07, 2019, 15:06

IGP1 =  1.17e-6 Torr

TGHT = 7.46 V, 439.3 A

TBHT = 4.13 V, 233.4 A

Autoramps

TGHT = -2 A/min, TBHT = -1 A/min

Monday, September 09, 2019, 16:34

The EVAP2 was vented and the target container was removed. 

 Wednesday, September 11, 2019, 15:12

A target container coated with TaC elog 455 was loaded with an empty graphite cartridge and set it in the EVAP2

The system is currently pumping down.

The target container was wrapped with 3 new Ta heat shields.

The target container will be heated to 2000 C and the temperature will be held for 4 hours.

 The autoramp was set to:

TGHT 1 A/min, 450 A

TBHT 0.5 A/min, to 230 A

At 500 A on the TGHT, 20 additional amps were programmed to increased at 1 A/min, however, the autoramp increased the current to 520 A without stepping (see figure A). 

The final conditions were:

TGHT: 9.95 V, 565.59 A

TBHT: 4.18 V, 233.43 A

IGP1: 2.2 e-6 Torr

Friday, September 13, 2019, 11:16

After 4 hours the EVAP2 was cooled down

at a rate of TGHT 1 A/min and TBHT 0.5 A/min

The EVAP2 was vented with air.

Swapped out VCRs on HS to tray connection. (Right one felt slightly off)

Tuesday, September 17, 2019, 13:23: roughing.

Tuesday, September 17, 2019, 13:32: Turbo pump on. 

Tuesday, September 17, 2019, 13:44: waterlines re-opened. No vacuum response. Ok. @ 7.90e-05T & dropping. 

Wednesday, September 18, 2019, 08:05: Vacuum ok @ 6.87e-07T. Turbo pump off. 

Wednesday, September 18, 2019, 08:21: Venting. 

Pumped down again easy for Ta#59. Issue resolved.