Monday, April 29, 2024, 19:50

Started coating with coating stand.

The coated container was wrapped in 3 Ta foil heatshields.

Vacuum IGP1 initial =9.1 e-07 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~700A (adjustable)

Heating autoramp starged at 2A/min(1A/30s) on  TGHT  100A

Then at 2A/min  to =700 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Monday, April 29, 2024, 20:25

Reached 1810 @700A

Will leave until 1230am

Wednesday, May 01, 2024, 11:53

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.1 e-06 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~500A (adjustable)

Heating autoramp starged at 3A/min(1A/30s) on  TGHT  100A

Then at 2A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Wednesday, May 01, 2024, 22:19

1830C reached at 670A. 10.0V TGHT

Start cooling after 4 hours. 

Friday, August 30, 2024, 11:31

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =3.1 e-07 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Heating autoramp starged at 1A/min on  TGHT  100A and TBHT

Then at 1A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

note: Left TBHT hole is off from center by a good margin

Sunday, September 01, 2024, 07:32

Starting initial ramp at 1A/min to 50A

Sunday, September 01, 2024, 15:20

have ramped ;up at 1A/min on both TGHT and TBHT but had two issues.

1) Set current and readback current have discrepancies but the TBHT discrepancy is significant (TBHT Set at 188 while RD is 231.9 A @ 1.9V)

   TGHT also has odd behavior with set point 405 giving 392A RD and 0.067V.  Will hold until 430pm before starting ramp down

Sunday, September 01, 2024, 16:30

Started rampdown at -2A/min TGHT and -1A/min TBHT

Note: OMEGA not able to give any reasonable readings

Tuesday, September 03, 2024, 13:51

After troubleshooting EVAP2 it was found that a copper line was touching the metal encasement grid most likely resulting in a short.  A short was seeing and it disappeared after moving the copper line away from the grid.  

Upon restarting on epics the PS went to maximum current and it was shut off after 30seconds to a minute.  The system was checked again by Arthur and TGHT was manually increased to 5A and then set to Zero again.  Arthur thinks that the PS probably requires this step after switching from local controls to remote.  Will start the sintering again as the container is coated but not sintered.

Tuesday, September 03, 2024, 14:03

ramping at 1A/min on both TGHT and TBHT to 90A. 

Tuesday, September 03, 2024, 22:25  

Started rampdown at -2A/min TGHT and -1A/min TBHT.  HIgh temperature from OMEGA was 1825 C at 430A readback on TGHT. 

Saturday, September 07, 2024, 09:54

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.1 e-07 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Heating ramp manually to 50A on TGHT and TBHT

Then at 1A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Saturday, September 07, 2024, 17:38

At 400 A set point on TGHT, read back is 392A and OMEGA reads 1840C.   TBHT set to 230A reads 233A.

It will be kept at this current for four hours before rampdown.

A boat lined up with graphite and wrapped in 3 Ta heatshileds

Vacuum IGP1 initial =6.1 e-06 Torr

Target temperature on OMEGA= 1800-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final TGHT current= ~400A (adjustable)

Heating autoramp started semi-manually on  TGHT  to 65A and then at continue to 100A

After peak heat at 1A/min  to =400 A TGHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Tuesday, September 10, 2024, 22:22

1810C OMEGA at 439A TGHT readback

Thursday, January 30, 2025, 09:17

Left to pump down on previous night

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.1 e-06 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~500A (adjustable)

Heating autoramp starged at 0.5A/min(1A/120s) to 60A on both TGHT and TBHT

Then at 0.5A/min  to 90 A, both TGHT and 230A TBHT

When pressure stable will ramp at 2A/min to ~500A on TGHT and 230A on TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Thursday, January 30, 2025, 09:20

currently ramping to 90A

Thursday, January 30, 2025, 12:30

Ramping to 120A @ 0.5 A/min

Thursday, January 30, 2025, 13:59

Ramping to 140 A at 1A/min (to check pressure change.  So far with slower heating, pressure has not spiked very high).

Thursday, January 30, 2025, 15:59

Started ramping @ 2A/30s to 500 A on TGHT

TBHT is at 230A

Thursday, January 30, 2025, 21:25

Target was sintered when OMEGA reading 1700-1750 C

At 640-660A on TGHT RD

Check target coating and repeat these setting if good.

Thursday, January 30, 2025, 21:43

Cooling started at -2A/min on TGHT and -1A/min TBHT

Saturday, February 01, 2025, 09:23

The coated container was wrapped in 4 Ta foil heatshield and left in evap2 over night to attain vacuum.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~650A (adjustable)

Heating autoramp starged at 1A/min on  TGHT  and TBHT to 120A

Then at 2 A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Initial IGP1=5.6e-07Torr

Saturday, February 01, 2025, 11:05

@ 194A, 2.5V on TGHT, the pressure is dropping (has been dropping since 150A).  starting ramp at 4a/min

Thursday, February 13, 2025, 11:40

Log entries lost as computer rebooted.  Max temperature on OMEGA was 1850 C and held for 4 hours.  Cooled @ -2A/min TGHT and -1A/min TBHT.

Monday, March 03, 2025, 17:56

LP FEBIAD WO# 45447-21 initial wt=471.0 g (without T bar)

wrapped in 4 Ta heatshields.

Will heat at 2A/min to 95A on TGHT and TBHT

Then will heat at 2A/min to 1800 C ~400A on TGHT and 230A on TBHT

 Monday, March 03, 2025, 18:01

IGP1=3.3e-06 Torr

started initial ramp to 95A

Monday, March 03, 2025, 21:52

Start 4 hour count at 940 pm 

OMEGA reading 1750 C

TGHT= 435 A set and RD = 426 A, 7.0V

TGHT = 230A

Tuesday, March 04, 2025, 01:42

Start rampdown

Monday, March 10, 2025, 09:50

The coated container was wrapped in 4 Ta foil heatshield and left in evap2  over weekend to decrease pressure.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~650A (adjustable)

Heating autoramp starged at 2A/min on  TGHT  and TBHT to 120A

Then at 2 A/min  to =400 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Initial IGP1=

 Monday, March 10, 2025, 10:36

Initial IGP1= 8.5 e-06 torr

Starting ramp to 120A for both TGHT and TBHT

Monday, March 10, 2025, 16:57

RD TGHT =686A set to 700A, 10.8V

TBHT = 230A, 3.1V

OMEGA= 1710

Will leave for 4 hours

 Monday, March 10, 2025, 20:42

IGP1=7.9e-06 Torr

OMEGA= 1750 C

TGHT = 686 A, 10.8V

TBHT= 230A, 3.1 V

starting rampdown at -2A/min TGHT and -1A/min TBHT

Tuesday, March 11, 2025, 15:44

The coated container was wrapped in 3 Ta foil heatshields.

16 caps and 4 springs

Target temperature on OMEGA= 1750-1800C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= N/A

Final TGHT current= ~400A (adjustable)

Wednesday, March 12, 2025, 07:07

Heating autoramp started at 1A/min on  TGHT 90A

Then at 4A/min  to 400 A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

 IGP1 initial =4.8e-07 Torr

Wednesday, March 12, 2025, 09:52

starting ramp at 2A/min to 400A 

Wednesday, March 12, 2025, 10:21

increasing ramp to 4A/min (2A/30s)

Wednesday, March 12, 2025, 11:57

TGHT=441A, 7.2V

Will keep for 4 hours

1750C

Wednesday, March 12, 2025, 15:57

starting rampdown at -2A/min

Tuesday, March 18, 2025, 06:48

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =9.1 e-07 Torr

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Heating autoramp starged a 2A/min on  TGHT   and TBHT

 to =300 A TGHT and 230A TBHT

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Tuesday, March 18, 2025, 13:47

OMEGA read 1850C at 380A on TGHT.  The temperature dropped and current was raised to 390A, 6.5V on TGHT.

TBHT was kept at 230A, 3.2V

Temperature dropped to 1756 after 4 hours of sintering.  Will start rampdown at -2A/min for TGHT and -1A/min TBHT. 

Wednesday, March 19, 2025, 13:08

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =

Target temperature on OMEGA= 1800-1850 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Thursday, March 20, 2025, 06:10 

IGP1 initial = 6.1e-7 Torr

 start ramp at 2A/min

Thursday, March 20, 2025, 07:04

paused ramp to prevent pressure spike

Thursday, March 20, 2025, 10:16

OMEGA 1800 C @ TGHT = 402A, 6.8V

Will leave for 4 hours.

Thursday, March 20, 2025, 13:53

Starting rampdown at 2A/min TGHT and 1A/min TBHT

Tuesday, March 25, 2025, 15:25

The coated container as wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =e-07 Torr

Target temperature on OMEGA= 1800-1850 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Will be left overnight to pump down

Wednesday, March 26, 2025, 09:07

starting ramp up at 2A/min to 230A for both TGHT and TBHT

Wednesday, March 26, 2025, 12:48

1800 C at 400A TGHT, 6.9V TGHT

Leaving for 4 hours

Friday, March 28, 2025, 06:49

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =8.0e-07 Torr

Target temperature on OMEGA= 1800-1850 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230 A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Starting ramp at 2A/min

Friday, March 28, 2025, 09:41

At 412A readback on TGHT OMEGA reads 1702 C.  Maybe re-use of Ta heatshields resulted in loss of efficiency.  Will ramp to 420 A and leave for 4 hours.

Friday, March 28, 2025, 14:25

Started rampdown at -2A/min TGHT and -1A/min TBHT

 Monday, August 31, 2020, 12:23

A short naked Ta tube (no heat shielding), previously coated with TaC was set under vacuum, 

and it will be kept at 2000 °C for 3 days to later identify the TaC's carbon penetration.

Currently pumping down.

 Tuesday, September 01, 2020, 12:25

IGP1 = 2.0-7 Torr

Good vacuum = 3e-2 Torr

Bad vacuum = 5e-2Torr

Autoram set to 200A at 10A/30 s

Tuesday, September 01, 2020, 12:36

IGP1 = 5.2e-7 Torr

Autoramp set to 300 A at 5 A/30 s 

Tuesday, September 01, 2020, 14:11

IGP1 = 3.4e-7 Torr 

TGHT = 330.2 A, 4.2 V

Omega = 1234 °C

Tuesday, September 01, 2020, 14:31

IGP1 = 1.76e-6 torr

TGHT = 6.94 V, 510 A

Oemga = 1564 C, 

AP = 1390.2 C

Autoramp set to 600 A at 5 A/30s 

Tuesday, September 01, 2020, 15:33

TGHT power supply = 600 A, 8.74 V

Omega = 1807 C

Autoramp set to 700 A at same rate

 Tuesday, September 01, 2020, 15:33

TGHT power supply = 11.94 V, 765 A

Omega = 2157 °C

Wednesday, September 02, 2020, 10:15 

IGP1 = 1.0e-6 Torr

TGHT = 12.0 V, 772 A

Omega = 2167 °C

Wednesday, September 02, 2020, 13:26

IGP1  = 9.1e-7 Torr

TGHT = 12 V, 769.5 A

Omega = 2166 °C 

Wednesday, September 02, 2020, 16:06

IGP1 = 8e-7 Torr

TGHT = 12 V, 773.3 A

Omega = 2167 °C 

Wednesday, September 02, 2020, 20:53

IGP1 =7.4e-7 Torr

TGHT = 11.8 V, 760.95 A

Omega = 2164 °C 

Thursday, September 03, 2020, 09:54

IGP1 = 5.5e-7 Torr

TGHT = 11.9 V, 774 A

Omega = 2162 °C 

Thursday, September 03, 2020, 11:06

IGP1 = 5.3e-7 Torr

TGHT  = 11.9 V, 758.7A

Omega = 2161 °C

Thursday, September 03, 2020, 14:39

IGP1 = 4.8e-7 Torr 

TGHT = 11.9 V, 771.8 A

Omega = 2164 °C

Friday, September 04, 2020, 09:34

IGP1 = 3.9e-7 Torr

TGHT = 11.9 V, 760.1 A

Omega = 2168 °C 

Friday, September 04, 2020, 13:39

 IGP1 = 3.5e-7 Torr

TGHT = 11.9 V, 758.6 A

Omega = 2170 °C

 Friday, September 04, 2020, 15:55

IGP1 = 3.5e-7 Torr

TGHT = 12 v, 760.6 a

Omega = 2171 °C

John Wong wrote:

Wednesday, September 07, 2016, 14:45 Container was previously coated with TaC solution and wrapped with 1-full length layer of Ta- heat shield around the fins.   Chamber is being pumped down.  Vac at 5.6e-7 Torr before HS water valves were open; no leaks were detected.  Sintering Temperature 1900C (Omega slope @ 0.98); expected TGHT ~765A/11.90V, TGHT max at 230A.  Thursday, September 08, 2016, 18:14 At about 1600C, it was observed that the coating inside the tube seems to chip off (see attachment 1). TGHT was ramped up to 745A/11.85V and TBHT to 230A/3.25V.  Temperature measured on OMEGA/Mikron = 1914C/1881C; both instruments slopes set at 0.98. Will remain at this TGHT current over night Vac at 3.0e-6 Torr and coming down. Friday, September 09, 2016, 11:01  Target has been heated at the stable temperature at 1914C (for OMEGA) and 1881C (for Mikron) with current at 745A/11.94V (see attachment 2) for almost 19 hours.  No fluctuation in p/s current or temperature was observed.  The ramping up process is captured and can be view from the link below: https://www.dropbox.com/sh/9lgtin54o17ds6j/AABn1-XjvK44mm74TjqTAmvta?dl=0 Pressure at 1.07e-6 Torr.  Cooling down TGHT at 2A/min and TBHT at 1A/min.  Continue to capture the cooling down process.   Friday, September 09, 2016, 15:17  While the target container was cooling down, the chip-like particle began obvious (see attachment 3).   Will inspect the container.. TGHT currently at 260A.

 Monday, September 12, 2016, 16:54

The TaC coating chipped off from the surface and didn't get sintered with the container.  (See attachment1). 

There are a few possible reasons why this happened:

1.  The coating was too think.  This may cause the TaC  layer to curl up while the heater was ramped up. 

2.  The coated material got brittle.  The container was flushed with TaC (probably a few weeks ago?) before it went through the sintering process.  Prolong exposure to air/light usually degrade the polymers viscoelasticity.

3.  TaC solution has got bad.  The particles can agglomerate over time and this can cause uneven surface.

4.  Combination of all... ???

Anyway, the chipped off TaC layer was gently scraped off with a stainless steel rod.  Then using kimwipes, i was able to remove most of the chipped off coating; it was not easy - especially trying to remove it from the inner tube.

Instead of "flushing" the tube with TaC, I decided to spray it with thin layer.  And using the air supply, I could quickly dry the coating and installed it back to the evaporator for 2nd Round sintering as we are approaching the deadline!

.                         

Wednesday, March 23, 2022, 10:49

Ta HP-FEBIAD was coated with TaC and wrapped with Ta heat-shields (3.5 layers) (two pieces around the fins only and 3 layers around the whole )

Desired temperature = 1800 C , TBHT will be set fixed at 230A (max).  TGHT expected to reach desired Temperature @~700A

Evap 2 was 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 @0.5 A/min to 60 A

 Wednesday, March 23, 2022, 11:37

Increase autoramp to 1A/min to 60A for both TGHT and TBHT

Wednesday, March 23, 2022, 12:24

Pressure increasing at 60A so will leave at this current until pressure drops

Wednesday, March 23, 2022, 13:32

IGP1 = 2.9e-06 Torr

Will autoramp at 0.5A/min to 90A both TGHT and TBHT

Thursday, March 24, 2022, 16:35

1800C reached at 724A TGHT .  TBHT @ 230A.  Will keep at this temperature for 4 hours. 

Thursday, March 24, 2022, 20:20

 IGP1 = 6.9 e-06 Torr

OMEGA= 1828 C

TGHT = 724 A, 11.6 V

TBHT = 232.8 A, 3.1 V

Will start ramp-down at 2035 @ -2A/min TGHT and -1A/min TBHT

Thursday, April 21, 2022, 09:43

TaC coated Target container was placed in Evaporator 2 yesterday and left pressuring down.

Ta Heatshields: 3

Target temperature on OMEGA = 1800-1850 C

OMEGA slope: 0.990

Target time at temperature = 4 hours

Target final TBHT current: 230A

Approximate final TGHT current: 420A (will adjust manually)

Heating autoramp started @ ~2A/min on both TGHT and TBHT

initial IGP1 = 9.3e-7 Torr

Thursday, April 21, 2022, 10:38

Pressure trending down after peak.  Start autoramp at 1A/min to 50A on both TGHT and TBHT.

Thursday, April 21, 2022, 10:56

Pressure continues to decrease.  Will ramp up faster @4A/min to 90A for both TGHT and TBHT.

Thursday, April 21, 2022, 11:07

Second peak has  begun to form .  Will keep at 90A awaiting stabilization

Thursday, April 21, 2022, 11:35

pressure stable.  Continue to autoramp at 1A/min and if pressure stable increase ramp to 4A/min

Thursday, April 21, 2022, 11:49

small peak observed and stabilizing.  Autoramp @ 6A/min to 400A on TGHT and to 230A on TBHT

Thursday, April 21, 2022, 12:35

Regression plot .  1800C should be reached ~1800C. 

Thursday, April 21, 2022, 12:44

Target current reached. 

OMEGA = 1762 C

Will manually bump current to 415 A

OMEGA = 1802 @ 415 A @ 12:51 pm

Thursday, April 21, 2022, 16:50

 OMEGA=1823 C

IGP1= 2.9e-06 Torr

TGHT= 417 A, 7.2 V

TBHT= 232A, 3.0V

Rampdown will start at -2A/min for both TGHT and -1A/min TBHT

 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.

Thursday, June 08, 2023, 09:28

Using smaller particle size TaC no ball mill procedure.

Loaded 2 TaC coated end caps and 1 TaC coated springs.

OMEGA Slope 0.99

Will heat to 1850-1900 C and hold for 4 hours

Good Vac = 5.0e-4 Torr

Bad Vac= 5.0 e-02 Torr

 Initial IGP1= 4.07E-06 Torr

Thursday, June 08, 2023, 10:36

ramped @ 2A/min to 100A.  Then after pressure stabilized starting ramp at 4A/min (2A/30s) to 400A

Thursday, June 08, 2023, 12:24

reached 1850 C with Set current = 480 and RD current = 470.6A, V = 7.7

Will leave for 4 hours.

Thursday, June 08, 2023, 15:31

ramping down at -2A/min (-1A/30s)