Tuesday, July 18, 2017, 15:26

Problems occured with TGHT water supply paddle wheel stopped and therefore tripped off evap2 last week.

All paddle wheels were replaced today for evap2 [other than the chiller].

A build up of dirt was found on all wheels replaced.

Evap2 good to go.

Will test flow meters before heating up to higher setpoints to confirm everything is working.

Monday, July 31, 2017, 15:24

Turned on BV and TP this afternoon.

Started ramping down, ~1min after turned on both tripped off.

Vacuum box turned red.

IGP1 appears yellow but still registering a vacuum.

TP interlocks: requires IEVAP2:IGP1 < 500mTorr but IGP1 = 6mTorr when tripped off.

Should have been satisfied and therefore not tripped but IGP1 not communicating?

Nothing wrong with ion gauge in person, vacuum good on direct read out.

When attempting 'Global Reset', nothing would reset - vacuum box remained red etc.

See screenshot attached of errors.

 Tuesday, August 01, 2017, 15:31

Had kept BP, PV and RV overnight.

This morning vacuum fine, everything had reset except "IEVAP2:TP on" under device notes for IEVAP2:TP remained red.

Turned on BV and TP, once turbo pump registered on, red wording went away.

Currently pumping down - everything looks fine now.

Still unsure of reason for these errors...

 Friday, August 04, 2017, 10:55

Happened again last night at ~5:45 while evaps at ~420A - see elog i.d. 383 for photos and details.

 Monday, July 31, 2017,  

Pellets previously pressed by Marla and Pauline. 

Pellets are placed inside a small graphite container.

Graphite container loaded with 5 pellets was loaded into Ta-boat previously coated with TaC.

Ta-boat is wrapped with 3 Ta heat shields.

Loaded in evaporator 2.

 Tuesday, August 01, 2017,

Chamber pumping down.

 Wednesday, August 02, 2017, 16:03

HS water valves were opened, no leaks were detected.

Current was tapped manually to 40 A.

After the stabilization of the vacuum auto ramping was set up to 0.5 A/min.

Up to a final set up point of 300 A.

Final desired temperature ~1700 C.

 Tuesday, August 08, 2017, 14:57

See elog i.d's #384 and #381

Investigated wiring in PLC.

Some wires in PLC were not creating a good contact - could be problem re: IGP1 tripping off.

Wires replaced by Gelo.

Pumped down and turned on power supplies over weekend.

Everything remained on - IGP1 did not trip system off.

May proceed with regular use.

 Tuesday, September 12, 2017, 12:00:

The coated back window was changed to a shuttered window.

On star-point flange bolt interfered with the shutter, however it was removed, shortened, and re-installed.

The installation is complete. Awaiting roughing pump to leak check.

 Monday, December 11, 2017, 14:21

Dave updated evap2 interlock limits to 500mTorr for TGHT and TBHT on friday

Wednesday, April 25, 2018, 07:05: TGHT & TBHT off

Wednesday, April 25, 2018, 07:15: BV1 & TP1 off

Wednesday, April 25, 2018, 07:17: PV1 & BP1off

Wednesday, April 25, 2018, 07:19: Begin venting

Wednesday, April 25, 2018, 07:22: Full venting.

Wednesday, April 25, 2018, 07:29: HS waterlines purged.

Wednesday, April 25, 2018, 07:48: Aurelia's test ta target assembly was removed. The blank target heating heat shield for evap 2 was reinstalled. shields in but empty.

Evap 2 Doors closed.

Saturday, April 28, 2018, 16:09

Container is coated with TaC and wrapped with TaC heatshield. 

Will be used for carbonizing nanoSiC target materials.

Chamber is pumping down...

Sintering temp 1800C, est TGHT ~550A

 Saturday, April 28, 2018, 18:08

Pressure at 5.e-6 Torr. 

Initial auto-ramp at 1.0A/min reaching TGHT 500A.  Monitoring temp.

 Sunday, April 29, 2018, 23:37

Target temp stabilizes at 1800C with TGHT holding at 400A/7.02V for 24 hours.  Pressure at 4.4 e-7 Torr.

Lower TGHT to 338A/5.51V to reach 1600C - This will temp/current will be used for carbonizing the nanoSiC fibers.

Holding TGHT overnight to determine temp stability.

 Monday, April 30, 2018, 18:04

Temp is holding at 1600C, TGHT 338A/5.5V.  Pressure at 3.0 e-7 Torr. 

Initiated cooling down at 2A/min.

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]

Alarm noted on passing Hot Lab. RPG notified, no radiological hazards. ISAC ops contacted, drop in DI water last night.

Entered w/ PPE. Chiller alarming. Evap 1 running ok

Friday, June 08, 2018, 08:30: Chiller turned on/off. Reset. No alarm.

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, September 11, 2018, 10:45:

TGHT: 53.4 A   TBHT: 57.75

Actual

TGHT: 60.0A  TBHT: 59.0A

Uploaded the rest to Word doc. Screenshots included.

 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. 

 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.