John Wong wrote:

Darwin Ortiz Rosales wrote: John Wong wrote: Carla Babcock wrote: Darwin Ortiz Rosales wrote: Wednesday, April 26, 2023, 09:32 LP FEBIAD loaded with 367 TiC discs and 4 TiC removable discs for analyses 50 packs of 5 and the rest are singles TaC coated (sintered) springs placed at both ends Initial total Weight = 521.83 g Initial heating @ 1A/min to 400 A on TGHT and 280A on TBHT OMEGA slope = 0.99 Vacuum limits up to 200A:  3.0e-05 Torr -- 5.0e-04 Torr Vacuum limit up after 200A: 3.0e-05 Torr -- 5.5e-05 Torr No Ta heat-shields used Initial IGP1 = 4.1e-07 Torr Wednesday, April 26, 2023, 09:49 Starting initial ramp up to 200A on both TGHT and TBHT @ 1A/min Wednesday, April 26, 2023, 12:50 Around 120A on TGHT, the pressure started to slowly drop.  First outgassing done. Wednesday, April 26, 2023, 14:03 IGP1 = 6.0 e-05 Torr TGHT = 200 A, 2.7V TBHT = 200 A, 2.6 v OMEGA = Below lower limit Waiting for pressure to fall below 5e0-5 Torr.  Will change bad vacuum to 5.0e-05 Torr and then continue ramping @1A/min to 400 A on TGHT and 280 A on TBHT. Wednesday, April 26, 2023, 14:13 IGPI= 4.2 e-05 Torr starting ramping to 400 A on TGHT and 280A on TBHT  Wednesday, April 26, 2023, 14:26 The IGP1 pressure just fell below 3.0e-05 Torr and ramping has resumed Wednesday, April 26, 2023, 14:42 pressure hovering around good vacuum so very slow progress. Wednesday, April 26, 2023, 15:12 TGHT= 223 A, 3.1 V TBHT = 226 A, 3.0 V Set ramp rate is 1A/min but real rate is slightly less than 0.5A/min due to pressure fluctuation.  Vacuum spike at 300A. Currently: TGHT= 316A, 4.6V TBHT=283A, 3.9V Wednesday, April 26, 2023, 18:18 Ramping TBHT down from 280A to 270A  Wednesday, April 26, 2023, 22:12 TGHT = 400A, 6.1V; TBHT = 274A/3.7V. Temp is holding sturdy ~1100 C and will leave it overnight. Pressure is coming down, currently at 8.8 e-6 Torr.  See attachment for the overview.  TGHT will continue to ramp up tomorrow morning; check the pressure to ensure it has come down below 5e-6 Torr before proceeding.  Refer to the instructions for details.         Thursday, April 27, 2023, 06:27 IGP1= 1.7e-06 Torr OMEGA= 1097 C TGHT= 400A, 6.2V TBHT= 273A, 3.7 V Starting ramp up of TGHT @0.2A/min set to 550A  Thursday, April 27, 2023, 22:04 TGHT has reached 580A/10.33V. Temp = 1540C.  The two out-gassing peaks were observed: 1st peak around 1300C and 2nd peak 1370C.  See attachments 1 & 2. A few minutes after TGHT reached to 580A, there was a small jump in TGHT current/voltage and also the pressure, but didn't notice any change in the temp, see attachment 3&4.  Pressure is currently at 3.4e-6 Torr; will hold TGHT until pressure reaches close to 1e-6 Torr before cooling down.   Friday, April 28, 2023, 01:06 Pressure has reached 1.8 e-6 Torr; TGHT has been holding at 580A for 3.5 hrs, a slight increase in voltage, reading at 10.45V and temperature, 1548C.  See attachment #5 for overview. Initiating auto-cooling TGHT at -2A/min, TBHT at -1A/min.

 Friday, April 28, 2023, 09:27

IGP1= 1.20e-07 Torr

Will dismount target around 10:15 am

Heating curve below.  Non-linear behavior

 Final weight = 517.08 g

Target looks good see attached picture

Monday, January 29, 2024, 16:36

LP FEBIAD

wrapped in 4 Ta heatshields.

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

Then will heat at 3A/min to 1800 C ~400A on TGHT and 230A on TBHT

Monday, January 29, 2024, 16:45

Initial IGP1= 5e-05 Torr

Monday, January 29, 2024, 20:35

1800C was at TGHT 410A, 6.9V  RD and set current 418A

TBHT= 233 RD A, 3.2V

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

Wednesday, May 24, 2023, 15:22

A Ta container tube was wrapped with 4 Ta heatshields.  Note final container is 45220-11

219 graphite discs were loaded.

a TaC coated Ta spring at the front end.

The system was left to establish vacuum over previous night.

Good vacuum set to5e-04Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including spring= 250.1 g

OMEGA slope = 0.99

The target will be heated to 2000 C, held there for 10 hours. 

Initial ramp at 1A/min to 200A

Then ramp at 0.5A/min while taking temperature readings periodically unti l250A.

At 250 A will let pressure stabilize and then ramp at 1A/min to 2000C or 450A.  

Will hold at target Temperature or Current for 10 hours before starting ramp-down.

 Wednesday, May 24, 2023, 15:50

Currently heating at 0.5A/min to250A.  Taking temperature/current measurements

IGP1= 1.06e-06 Torr

Wednesday, May 24, 2023, 18:28

heating at 1A/min to 275A to collect more temperature data

Wednesday, May 24, 2023, 19:22

Slight offset between set and RD current observed. 

Ramping at 1A/min to 440A according to the regression below

Should be around 2000 C.

Wednesday, May 24, 2023, 20:22

Currently at 339 A, 4.8V

OMEGA = 1614 C, IGP1= 2.04e-06 Torr

Will ramp up at 2A/min to 450A as new data point suggests

Wednesday, May 24, 2023, 21:05

heating curve has new slope suggesting 500A as minimum to reach 2000 C

Increasing ramp to 1A/10s to reach 450A

Wednesday, May 24, 2023, 21:17

TGHT

IGP1= 3.9e-06 Torr

Continue ramping to 480A

Wednesday, May 24, 2023, 22:11

Offset between setpoint of current and readback.  readback 10A below. 

Will keep at this setting until 7:30 am tomorrow then start ramp down @-2A/min

Thursday, May 25, 2023, 07:25

OMEGA=1912C, IGP1 =1.29e-06 Torr, TGHT = 480A, 9.0V

begin ramp down at -2A/min

Thursday, May 25, 2023, 09:52

Some odd current readback behaeviour noticed.  Have contacted Gelo from controls.  He will look at it next week.  Discrepancy between read back and set point and drop in read back currrent. See picture

Wednesday, February 07, 2024, 22:36

Ta container tube TaC coated, wrapped in 4 Ta foil heat-shields, and loaded with 320 D shaped discs in a 12mm graphite cartridge with usable 11mm

Endcaps on the graphite cartridge have holes for outgassing

initial heating @ 2A/min to 90 A then 1A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Thursday, February 08, 2024, 06:18

Starting heat ramp tght

initial pressure = 8.1e-07 Torr IGP1

Thursday, February 08, 2024, 06:54

start of gasoff observed. paused ramp and will continue at 1A/min

Thursday, February 08, 2024, 07:24

lowered TGHT current to 75 A as pressure increasing too rapidly.  will leave at this current until pressure drops

Thursday, February 08, 2024, 09:11

continuing ramp to 120A on TGHT

Thursday, February 08, 2024, 09:24

Increasing ramp to 2A/min to 250A on TGHT

Thursday, February 08, 2024, 10:52

Increased ramp to 3A/min to 250A on TGHT

Thursday, February 08, 2024, 11:10

Everything looks good will continue to 300 A at 3A/min TGHT

Thursday, February 08, 2024, 11:33

Pausing heating at 285A, 4.8V TGHT

OMEGA reads 1430C

Will let pressure drop and then proceed ramping slowly @ 0.2A/min

Thursday, February 08, 2024, 13:53

IGP1= 2.4e-06 Torr

OMEGA = 1432 C

ramp at 0.2A/min towards 1550C

Thursday, February 08, 2024, 14:07

pressure very stable.  will increase to 0.4 A/min

Thursday, February 08, 2024, 15:24

increasing ramp rate to 1A/min

IGP1 = 2.5e-06 Torr

Thursday, February 08, 2024, 18:05

1900 C on OMEGA

will leave 3-4 hours depending on pressure

Thursday, February 08, 2024, 21:10

No additional pressure peaks observed and pressure on IGP1=  1.9e-06 Torr

TGHT= 460 A, 8.1V

OMEGA= 1860 C

ramp down at -2A/min

Wednesday, February 21, 2024, 06:22

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with 201 D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 44692-13

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

initial heating @ 2A/min to 90 A then 1A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Wednesday, February 21, 2024, 09:12

IGP1 initial = 9e-07 Torr

Starte at 3A/min to 90A

Wednesday, February 21, 2024, 09:21

increased autoramp to 4 A/min until pressure starts rising, then will slow down or pause

Wednesday, February 21, 2024, 09:32

At 74A, paused.  Will continue at 2A/min TGHT

Wednesday, February 21, 2024, 09:40

Pausing at 87A. 

Wednesday, February 21, 2024, 10:34

pressure dropping.  restarting ramp up to 120A at 2A/min

Wednesday, February 21, 2024, 10:37

From previous TiC 220206, will heat up fast until 250A and then at 1A/min until 300A to better resolve out-gassing profile

Wednesday, February 21, 2024, 12:05

Changed ramp to 1A/min to 300A

Wednesday, February 21, 2024, 13:10

Manually ramped up for a while

increased ramp speed to 2A/min

regression line started to match previous one after 1300C

Wednesday, February 21, 2024, 13:16

increased ramp rate to 4A/min to 420A

Wednesday, February 21, 2024, 13:37

Note: the temperature became unrealistic.  suspect window condensate.  Will use regression and to to 441A

Wednesday, February 21, 2024, 13:54

reached 441A, 7.6V

leaving for 3.5 hours or when pressure drops to 2-3 e-06 Torr

Wednesday, February 21, 2024, 18:56

IGP1=2.9e-06 Torr

starting rampdown at -2A/min

Thursday, February 29, 2024, 07:40

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with _________ D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 44692-13

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Thursday, February 29, 2024, 07:43

Initial IGP1=  9.31e-7 Torr

Thursday, February 29, 2024, 17:43

Temperature profile suggests 1900 C at 400A.  Now at 400A.  Will keep at this current for 4 hours.

manually ramped the last few amps.

TGHT= 400A, 7.3 V OMEGA = 1901C

Thursday, February 29, 2024, 22:20

IGP1=2.1e-6 Torr

started ramping down at -2A/min

Wednesday, April 03, 2024, 06:46

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with _________ D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 44692-13

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Wednesday, April 03, 2024, 06:49

initial IGP1= 1.28e-06 Torr

Wednesday, April 03, 2024, 09:26

IGP1= 2.3e-05 Torr

TGHT = 78 A, 1.3V

Will continue ramp as planned.

Wednesday, April 03, 2024, 11:37

Ramping at 2A./min to 400A

Wednesday, April 03, 2024, 14:01

expected 1900C at 401A

leaving at 402A for 4 hours.  Rampdown start at 4:10 pm at -2A/min

Thursday, April 04, 2024, 12:06

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with _________ D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 44692-13 (4th conditioning with this tube)

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Mas current~400A (1900 C)

Friday, April 05, 2024, 09:04  

Ramping to 85A done and pressure trending down.  Will continue ramp to 120A

Friday, April 05, 2024, 16:01

Starting rampdown at -2A/min

IGP1= 3.2e-06 Torr

Monday, May 27, 2024, 07:09

Small graphite cartridge was loaded with SiC discs 240523-1 and 240523-2.  Discs produced without milling using PAA as a dispersant.

The coated container tube was wrapped in four Ta foil heatshields.

two Tac Coated springs at the ends in case plugs are pushed outwards.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final TGHT current= ~400A (adjustable)

Heating autoramp 2A/min to 90 A

Then at 2A/min to 120A.

Good vacuum = 5.0 e-02 Torr

Bad vacuum = 5.0E-04 Torr

 IGP1 initial 4.8e-07 Torr

Monday, May 27, 2024, 09:13

Pressure started coming down.  Heat at 2A/min to 120A.

Monday, May 27, 2024, 10:21

Started ramp 2A/30s  to 400A will monitor temperature

stopped at 490A and will hold for 4  hours. 

Monday, May 27, 2024, 12:41

temperature started creeping up past 1870C so decreased current to 461A

Current temperature is 1842 C at 461A, 7.6V

Monday, May 27, 2024, 12:55

dropped current to 441 because temperature climbed to 1899 C

Monday, May 27, 2024, 15:08

final pressure IGP1 =9.9 e-07 Torr

OMEGA= 1830 C at 410 A (reduced as needed)

Start rampdown at -2A/min

Wednesday, May 29, 2024, 10:07

Final pressure is 2.7e-7 Torr

Wednesday, May 29, 2024, 14:42

Experiment failed.  Too hot probably.  Bad temperature readings.  Will repeat after redesigning experiment.

Wednesday, May 29, 2024, 22:52

Small graphite cartridge was loaded with SiC discs 240523-1 and 240523-2 and 220727-2 (baseline discs).  Test Discs produced without milling using PAA as a dispersant.

The coated container tube was wrapped in four Ta foil heatshields.

two Tac Coated springs at the ends in case plugs are pushed outwards.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final TGHT current= ~400A (adjustable)

Heating autoramp 2A/min to 90 A

Then at 2A/min to 120A.

Good vacuum = 5.0 e-02 Torr

Bad vacuum = 5.0E-04 Torr

 IGP1 initial 4.8e-07 Torr

Wednesday, May 29, 2024, 22:54

Kept at 400 A for 4 hours. 

Starting autoramp down at -2A/min

Monday, March 10, 2025, 16:53

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

TBHT = 230A, 3.2V

OMEGA reads 1700 but will keep here for 4 hours.

Wednesday, June 05, 2024, 07:14

SiC discs loaded into tantalum tube.  New mixing (two types) and old mixing.

The coated container tube was wrapped in four Ta foil heatshields.

Tac Coated springs at the ends in case plugs are pushed outwards.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:=* 0.980*

Target time at max temperature = 4 hours

Final TGHT current= ~400A (adjustable)

Heating autoramp 1A/min to 90 A

Then at 2A/min to 120A.

Good vacuum = 5.0 e-02 Torr

Bad vacuum = 5.0E-04 Torr

 IGP1 initia1.3e-06Torr

Wednesday, June 05, 2024, 11:04

Continuing to ramp at 2A/min to 350A

Wednesday, June 05, 2024, 12:22

Leaving at 369 A for 4 hours (until 4 pm).  Temperature readings do not appear good.

Wednesday, June 05, 2024, 16:01

Start rampdown at -2A/min

IGP1=2.0 e-6 Torr

Aaron Schmidt wrote:

Wednesday, August 07, 2024, 15:36: Roughing. Had initially been roughed & TP started w/ Marla CS, however it timed out. Restarting. Wednesday, August 07, 2024, 15:37: TP on. Wednesday, August 07, 2024, 15:46: Tripped at 4 KRPM. Restarted. Up to 5 KRPM. Failed to start. Thursday, August 08, 2024, 10:00: TP started.  Thursday, August 08, 2024, 10:12: TP Tripped but nearly spun up. Reset & Restarted. TP Green / on.

Thursday, August 08, 2024, 10:43

A cartridge was filled with graphite foils and loaded in an uncoated tantalum tube. The tube was wrapped with four Ta-sheets. A Ta-foil was placed in the tube's right end for measuring the temperature.

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial IGP1 = 5.06E-7 Torr

Starting ramp at 1A/min to 200 A

Friday, August 09, 2024, 09:40 Pressure started to rise, but temperature is not within pyrometer range yet. Current 42 A, Voltage 0.5 V

Friday, August 09, 2024, 10:46 Pressure started to reduce (peak 1.4e-5 Torr). Temperature is not within pyrometer range yet Current 100 A, Voltage 1.3 V

Friday, August 09, 2024, 11:28 Temperature started to be detected, but not stable enough. Current 135 A, Voltage 1.9 V

Friday, August 09, 2024, 12:54 Temperature 1129 °C, current 196 A, voltage 3 V.

Friday, August 09, 2024, 12:56

Next ramp 0.5A/min while taking temperature readings periodically until 250A

Friday, August 09, 2024, 14:45

IGP1 = 1.0e-6 Torr

Next ramp 1A/min to 480 A aiming at 2000 °C

Friday, August 09, 2024, 17:13

IGP1 = 1.9e-6 Torr, Current 327A, Voltage 5.3V

Ramp changed to 2A/min to 480 A aiming at 2000 °C

Coolded down after 4 hours at ~2000°C

at -2A/min

Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on

Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Marla Cervantes wrote:

Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on

Wednesday, August 14, 2024, 10:18

The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

Marla Cervantes wrote:

Marla Cervantes wrote: Tuesday, August 13, 2024, 17:20 Pressure kept increasing when turning the turbo pump on Tuesday, August 13, 2024, 18:00 Pressure stayed constant when turning the turbo pump on Wednesday, August 14, 2024, 10:18 The turbo pump started up normally. System is purging. and tomorrow the target will be heated.

 Wednesday, August 14, 2024, 16:19

• Next ramping: 0.5 A/ 2min  to 250 A.

Very slow rate to allow thermal equilibrium and temperature measurements. Estimated time 3h.

Thursday, August 15, 2024, 08:21

IGP1 = 5.3e-7 Torr

Good vacuum 3e-5 Torr

Bad vacuum 5e-5 Torr

Initial ramping: 2 A/min to 200 A.

Thursday, August 15, 2024, 09:01. Pressure starting to increase at 74 A

Thursday, August 15, 2024, 09:15. Pressure stabilizing 1.8e-6 Torr. Current 103 A, voltage 1.3 V

Thursday, August 15, 2024, 09:21. Pressure increasing (116 A).

 Thursday, August 15, 2024, 09:29 Pressure dropping (Current approx. 120 A)

Thursday, August 15, 2024, 10:54

Started ramping to find a pressure peak corresponding to V vaporization.

IGP1 = 6.4e-7

TGHT = 200 A, 2.9 V, omega 1152 °C

Next ramping: 0.5 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:17

Ramp seem to slow. The temperature change was too subtle (according to the omega).

IGP1 = 6.5e-7

TGHT = 205 A, 3.03 V, omega 1157 °C

Next ramping: 1 A/ 2min  to 250 A

Thursday, August 15, 2024, 11:32

Ramp changed to 0.5 A/min

Thursday, August 15, 2024, 11:54

Ramp was stopped because the pressure was increasing, suggesting the V vaporization.

IGP1 = 6.9e-7

TGHT = 222 A, 3.3 V

Omega 1210 °C, filament 1280 °C

The difference between pyrometers is negligible, suggesting that the V vaporization temperature at 6e-7 Torr of approx. 1300 °C

 Thursday, August 15, 2024, 13:15

IGP1 = 7.9e-7

TGHT = 250 A, 3.8 V

Omega 1289 °C

Thursday, August 15, 2024, 13:16

Ramp set to 0.5 A/min to 300 A

 Pressure mini-spike at 13:18

Omega reading 1291 °C

Thursday, August 15, 2024, 14:08

IGP1 = 8.5e-7

TGHT = 270 A, 4.18 V

Omega 1375 °C, filament 1400 °C

The system stayed at those conditions for 15min

Thursday, August 15, 2024, 14:11

Ramping to 0A at 2A/min

Wednesday, October 02, 2024, 19:21

Ta endcup at front end of container

End-caps on the graphite cartridge have holes for outgassing. 

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT.  Allow pressure to drop and then ramp to 400 A at 2A/min, leave 4 hours and start ramp down.

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Max current~400A (1900 C)

Wednesday, October 02, 2024, 19:25

Starting IGP1 = 6.65e-06 Torr

Thursday, October 03, 2024, 05:09

Starting rampdown.  Pressure stable at 4.5 e-06 Torr

Top temperature 1850 C on OMEGA

ramping down at -2A/min

Saturday, November 23, 2024, 11:08

 No milling ZrC material sintering inside graphite cartridge

baseline standard discs included for comparison. 

4 Ta foils wrapped around  container

one spring at the back end to retain the graphite cartridge

One Ta cap with perforations at the front for T readings

initial heating at 2A/min to 50A, followed by heating at 1A/min to 90 A

Initial IGP1= 1.0e-6 Torr

OMEGA slope =0.990

Good and bad vacuum =5.0e-5 Torr and 5e-4 torr

Saturday, November 23, 2024, 11:20

autoramp start at 2A/min to 50A on tght

Saturday, November 23, 2024, 20:11

allowed pressure to drop to 3.3e-6 Torr after degassing. 

Started ramp to 90A at 1A/min

Saturday, November 23, 2024, 23:46

started ramping at 1.5A/120s or 0.75A/min to 400A

Sunday, November 24, 2024, 07:55

Reached 1900 C at 410 A setpoint and 402 A on RD

Pressure did not increase after bumping up to 410 setpoint so will keep at this current until 11 am (four hours near 1900 C in total)

Sunday, November 24, 2024, 10:58

Final IGP1 at start of rampdown = 2.9e-6 Torr

Ramping down at -2A/min

Friday, April 11, 2025, 06:18

 initial IPG1=2.3 e=06 Torr

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with _________ D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 41882-4

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Friday, April 11, 2025, 14:45

reached 1800 C on OMEGA at 398A readback

Will take to ~410 A and leave for 4 hours

Friday, April 11, 2025, 18:55

at 415A OMEGA was 1879 C

was left for 4 hours at this setting

starting rampdown at -2A/min

Wednesday, April 23, 2025, 06:46

initial IPG1=1.3 e06 Torr

Ta container tube, wrapped in 4 Ta foil heat-shields, and loaded with _________ D shaped discs in a 12mm graphite cartridge with usable 11mm

conditioning tube WO = 41882-4

End-caps on the graphite cartridge have holes for outgassing.  One spring each end in the Ta container

cartridge #26   TiC250307

initial heating @ 2A/min to 85 A then 2A/min to 120A TGHT

OMEGA slope = 0.99

Vacuum limits up to 400A: 5.0e-04 Torr -- 1.0e-02 Torr

Wednesday, April 23, 2025, 09:57

IGP1=3.2e-05 Torr

autoramping to 120A

Wednesday, April 23, 2025, 18:20

OMEGA = 1850 at 402A, 7.9 V

raised to 405 A for the last 15 minutes.

starting rampdown at -2A/min