Tuesday, May 01, 2018, 18:06

21 fibrous discs of nanoSiC are loaded into a tube container (coated/Sintered with TaC). 

Thermal treatment temperature at 1600C, TGHT is ~338A/5.5V, according to elog #407.

 Wednesday, May 02, 2018, 08:27

20 mins ago... initiate auto ramping at 0.2A to reach TGHT 250A.  Instead of ramping incrementally, TGHT jumped straight to 250A; vacuum shot up to milli torr.

Turn off TGHT immediately to let vacuum stable down to 10-6 Torr. 

System problem??  Archive striptool for more details. 

Re-activate auto-ramping - OK!

Once TGHT reached 250A (18 hours later from now), will continue ramping up to reach 1600C

 Friday, May 04, 2018, 01:09

TGHT just reach 250A, temp at about 1190C.  Pressure remained high at 4.2e-5 Torr. 

Continue autoramping to reach TGHT 300A.

 Friday, May 04, 2018, 11:07

TGHT at 300A for about 1.5 hr.  Temp at 1315C.  Pressure at 5.7e-6 Torr.

Autoramp to 320A.

 Friday, May 04, 2018, 14:39

Tapping up to 330A; temp at 1560C with slope changed to 1.05 (for carbide material). Will keep at this current/temp.

 Sunday, May 06, 2018, 13:25

TGHT at 330A/5.2V; holding temp at 1550C.  No coating on windows.  Pressure at 1.6e-7 Torr.

Cooling down at 2A/min. 

 Monday, May 07, 2018, 10:49

Evap cooled.  Venting chamber. 

Inspection of the discs next...

mass loss = 6.79 - 3.62 = 3.1 g (46%) [in agreement, good]

Tuesday, May 08, 2018, 15:02

22 np-SiC fibrous discs loaded in the tube container (coated and sintered with TaC)

Heat treatment is similar to previous process, see elog #408. 

TGHT should be set at 330A/5.2V to reach temp 1575C (+/- 25).

Omega slope set at 1.05 (for carbide)

Chamber is currently being pumped down

 Tuesday, May 08, 2018, 22:46

Pressure at 2.2e-6 Torr.

Initiated autoramping at 0.2A/min to reach 330A

 Friday, May 11, 2018, 11:11

TGHT reached to 330A/5.1V but temp was measured at 1400A; It was held at that current for about 10 hours.

Increased TGHT to 335A/5.2V - temp is holding at 1420C (Will check the window if there is any coating that might have caused the discrepancy)

 Sunday, May 13, 2018, 00:25

In fact, the window is slightly coated.  The temperature should already be at optimum, 1600C.  Will keep heating for another day.

 Sunday, May 13, 2018, 14:10

Temp holding up well.. Pressure at 1.8e-7 torr. 

cooling down at 2A/min.

 Monday, May 14, 2018, 09:33

Target has been cooled for over 18 hours.  Pressure at 1.1e-7 Torr.

Venting chamber.

mass loss = (8.65 - 4.32)g = 4.33 g (50%) [slightly higher than expected, likely due to increase of 5A on TGHT]

Wednesday, May 16, 2018, 09:56

Container coated with TaC using 'flushing technique' and let dry over weekend.

Cleaned ionizer tube with acetone, no coating inside ionizer tube.

Wrapped with 3 x Ta heat shields, not incl center block

OMEGA slope = 0.98

*NOTE: realized after pumping down, filament on IGP2 is burnt out and needs replacing, will order a new one and use IGP1 for this process

Thursday, May 17, 2018, 13:15 

HS water valves remained open since the last time evap2 was used, no leak check done.

Tapped up manually to 50A.

Waited ~1hr

Vacuum stable.

IGP1 = 1e-6 Torr

Initiating auto ramp for TGHT @ 0.2A/min to a max setpoint of 350A

Initiating auto ramp for TBHT @ 0.1A/min to a max setpoint of 230A

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

Friday, May 18, 2018, 13:00 

Tapped up manually.

TGHT = 495A, 8.84V

TBHT = 230A, 3.26V

MIKRON = 2000C

Filament = 1910C

OMEGA = 1910C

Will remain at max setpoints over weekend.

Tuesday, May 22, 2018, 10:04 

Remained at max setpoints over long wknd.

TGHT = 495A, 8.85V

TBHT = 230A, 3.26V

IGP1 = 2.47e-7 Torr

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

Wednesday, May 23, 2018, 10:08 

Vented in air this morning.

Container looks good!

Transferred into glove box.

 Ta#56 HP-SIS target description:

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

Foil Thickness = 0.025mm

Target density = 14.01 g/cm3

Target length = 3.4 cm

Total Mass = 47.374 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven= 1469 g

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

Thursday, June 21, 2018, 11:430: Ta#56 loaded into Evap 2 

Thursday, June 21, 2018, 11:37: Roughing

Thursday, June 21, 2018, 11:48 : Turbo pump started.

Thursday, June 21, 2018, 11:56 : Turbo pump at speed

Monday, June 25, 2018, 08:00: Vacuum @ 3.35e-07T

Monday, June 25, 2018, 08:05: TGHT/TBHT Power supplies switched on.

Monday, June 25, 2018, 09:35: Vacuum @ 3.23e-07T. Manually bump up TGHT to 40A.

Slope found / set.

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

Monday, June 25, 2018, 11:41: Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 300 / 180 A 

Monday, June 25, 2018, 13:28: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 248 / 110 A

Monday, June 25, 2018, 13:50: TGHT ramping halted momentarily. Limit increased to 350 A, continue ramping.

Monday, June 25, 2018, 14:44: Check: Vacuum @ 1.08e-06T. TGHT / TBHT @ 350 / 180 A. (hold till am)

Omega: 1033 deg C

Tuesday, June 26, 2018, 08:37: Vacuum @ 3.03e-07T. Auto-ramping TGHT / TBHT @ 2 / 1 A per min to 600 / 230 A . Omega: 1010 deg C (approx)

Tuesday, June 26, 2018, 11:25: Vacuum @ 1.34e-06T. TGHT / TBHT @ 248 / 110 A. Omega: 1605 deg C (approx) 

Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:06: Limited at 608A ? Display still ramping past the auto-ramp limit. 

Tuesday, June 26, 2018, 12:24 : Auto ramp halted. Display brought to 610 A. Readback 603 A

Tuesday, June 26, 2018, 12:41: Voltage limit adjusted to 12.00V. Mnaualy increased TGHT to 620 A. Auto-ramping TGHT  @ 2 A per min to 650 A

Tuesday, June 26, 2018, 12:59: Check: Vacuum @ 1.53e-06T. TGHT / TBHT @ 650 / 230 A. 

Omega: 1747 deg C

Tuesday, June 26, 2018, 15:07: Check: Vacuum @ 9.73e-07T. TGHT / TBHT @ 650 / 230 A. (hold till am)

Omega: 1760 deg C

Wednesday, June 27, 2018, 07:49: Check: Vacuum @ 5.06e-07T. TGHT / TBHT @ 650 / 230 A.

Omega: 1796 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min with pause at 675 A. Monitor.

Wednesday, June 27, 2018, 08:00: Check: Vacuum @ 5.80e-07T. TGHT / TBHT @ 675 / 230 A.

Omega: 1843 deg C. Begin auto-ramping TGHT to 700 A @ 2 A per min. Monitor.

Wednesday, June 27, 2018, 08:16: Vacuum @ 7.45e-07T. TGHT / TBHT @ 700 / 230 A. Omega: 1890 deg C (approx). 

Wednesday, June 27, 2018, 08:23: Vacuum @ 8.53e-07T. TGHT / TBHT @ 707 / 230 A. TGHT Voltage= 10.783V. Omega: 1906-1913 deg C. Desired temperature = 1900C reached.

Wednesday, June 27, 2018, 13:11: Vacuum @ 6.77e-07T. Omega: 1902-1915 deg C

Wednesday, June 27, 2018, 14:53: Begin auto-cooling TGHT / TBHT @ - 2 / -1 A per min overnight. 

Thursday, June 28, 2018, 07:39: Power supplies off. Turbo pump off.  

Thursday, June 28, 2018, 09:38: Vented. Remove From Evap 2.

Tuesday, July 03, 2018, 17:02

49 discs/ 15.42g np-SiC fibrous discs loaded into the tube container

Heat treatment is similar to previous process, see elog#408/409.

TGHt should be set at 330A/5.2V to reach temp 1575C (+/- 25C)

Omega slope set at 1.05 (for carbide)

Chamber is currently being pumped down

 Wednesday, July 04, 2018, 10:38

Pressure at 1.5 e-6 Torr.

Initiated auto-ramping at 0.2A/min to reach 330A/5.2V.

 Monday, July 09, 2018, 14:44

TGHT has been stabilized at 330A/5.2V for 24 hours.  Pressure at 3.7e-7 Torr.

Temp was measured at 1400C - light coating on window likely affected the measurements.

Measured with one-color pyrometer on Ta body inside the target container = 1550 C (with the correction of 250C for Ta). 

Adjusted OMEGA slope to 1.18, temp currently at 1580 C.

 Monday, July 09, 2018, 16:42

Pressure stabilized at 3.5e-7 Torr. 

Initiated auto-cooling at 1A/min.

 Tuesday, July 10, 2018, 11:11

Target is at room temperature. 

Process completed; see attachment for the data retrieval and dropbox (np-SiC production folder) for screen capture.

mass loss = (15.42 - 8.09) g = 7..33 g (47.5%) [in agreement - good!]

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.

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

 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.

 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.

 Wednesday, October 31, 2018, 19:35

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

 Thursday, November 01, 2018, 10:31

Pressure at IGP1 9.44e-7 Torr. 

Tapped up TGHT and TBHT manually to 40 A

Thursday, November 01, 2018, 12:32

Waited ~1 hr for vacuum to stabilize.

IGP1 = 1.42e-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

 Tapped manually to 445 A, Temperature 1896 C.

Friday, November 02, 2018, 07:35

TGHT 7.86 V 445.6 A

TBHT 3.22 V 233.3 A

IGP1 1e-6 Torr

Ramping down TGHT and TBHT to 0 A @ 2 A/min.  

Friday, November 02, 2018, 17:28

Monday, October 29, 2018, 12:39

Venting EVAP2, TaC coat sintering completed. 

 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. 

 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.

 Tuesday, January 15, 2018, 17:30

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).

EVAP2 currently pumping down.

 Pressure at IGP1 4.71 -7 Torr. 

Tapped up TGHT manually to 40 A

Waited ~1 hr for vacuum to stabilize.

IGP1 = 9.96-7 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 set point of 350 A

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

 Thursday, January 17, 2019, 15:31

The tube remained at ~1900 C for 6 hours.

IGP1=5.8e-7 Torr

TGHT = 427 A, 7.23 V

Min Temperature = 1890 C

Thursday, January 17, 2019, 15:33

 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.  

 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

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.

 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.