Tuesday, August 15, 2023, 10:48

The coated container was wrapped in 4 Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= N/A

Final TGHT current= ~400A (adjustable)

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

Then at 4A/min  to 100 A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

 IGP1 initial =8.9e-06 Torr

 Tuesday, August 15, 2023, 13:00

Tuesday, August 15, 2023, 13:00

Pressure stabilizing @8.8e-06 Torr

starting 2A/30s ramp to 400 A

Tuesday, August 15, 2023, 14:02

TGHT RD CURRENT = 331.4A, 5.8V, SET CURRENT=338 A. 

OMEGA = 1855

IGP1= 1.5e-05 Torr

Leave for 4 hours

Tuesday, August 15, 2023, 15:05

Temperature dropped slightly to 1820C so increased current set point to 345A, and RD was at 338A, 5.9V

OMEGA increased to 1842C

Tuesday, August 15, 2023, 17:59

OMEGA = 1823C

TGHT= RD 338A, 5.9V   SET= 345A

IGP1= 4.0e-06 Torr

Start rampdown at -2A/min

Nb#10 LP-IG-LIS target description:

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

Foil Thickness = 0.025mm (0.001")

Target density =  7.36 g/cm3

Target length = 3.5 cm

Total Mass = 25.7576 g [Incl foils + Ta wire on 6 packs]

Total mass w/ Target oven=  438 g (w/ end caps)

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

Dimpling direction on foils/ Packs.                                                               --> Center <--

End caps installed (Not expanded). No Ta foil heat shield added

Wednesday, June 21, 2023, 10:37: Roughing.

Wednesday, June 21, 2023, 13:39: TP1 on. 

Wednesday, June 21, 2023, 13:55: TGHT / TBHT PS on. Vacuum @ 3.35e-05T

Thursday, June 22, 2023, 13:16: TGHT / TBHT Manually set to 5 / 5 A. Vacuum @ 8.17e-07T.

Final desired temperature = 1900C.

Thursday, June 22, 2023, 13:49: OMEGA slope = 0.98.

Friday, June 23, 2023, 06:24: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min. 

Friday, June 23, 2023, 12:11: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 610 A @ 2 A per min (600 A w/ offset). Temperature @ 1697 C. Vacuum @ 3.38e-06T.

Friday, June 23, 2023, 12:32: TGHT / TBHT @ 610 / 230 A (600 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min (620 A w/ offset). Temperature @ 1748 C. Vacuum @ 4.61e-06T.

Friday, June 23, 2023, 12:44: TGHT / TBHT @ 630 / 230 A (617 / 233 A). Auto-ramping TGHT to 650 A @ 2 A per min (640 A w/ offset). Temperature @ 1790 C. Vacuum @ 5.74e-06T.

Friday, June 23, 2023, 13:07: TGHT / TBHT @ 650 / 230 A (638 / 233 A). Auto-ramping TGHT to 670 A @ 2 A per min (660 A w/ offset). Temperature @ 1825 C. Vacuum @ 5.90e-06T.

Friday, June 23, 2023, 13:22: TGHT / TBHT @ 670 / 230 A (658 / 233 A). Auto-ramping TGHT to 680 A @ 2 A per min (668 A w/ offset). Temperature @ 1858 C. Vacuum @ 6.75e-06T. 

Friday, June 23, 2023, 13:29: TGHT / TBHT @ 680 / 230 A (667 / 233 A). Auto-ramping TGHT to 690 A @ 2 A per min (677 A w/ offset). Temperature @ 1877 C. Vacuum @ 6.99e-06T. 

Friday, June 23, 2023, 13:37: Manually tap up to temperature. 

Friday, June 23, 2023, 13:38: Vacuum @ 7.54e-06T. TGHT /  TBHT @ 694 / 230 A (680.5 / 233 A direct w/ offset). Temperature @ 1901-1902 C. Desired Temperature Reached.

Friday, June 23, 2023, 13:42: Auto-cooling @ 2 A per min. 

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)

Tuesday, June 06, 2023, 09:11

A Ta container tube was wrapped with 4 Ta heatshields.  Note final container is 45220-6

272 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= 253.94 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 480A.  Will use read back current

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

Tuesday, June 06, 2023, 09:14

 Starting ramt at 1A/min

initial IGP1= 8.2e-07

Tuesday, June 06, 2023, 21:25

@480 A on readback, 1823C on OMEGA.  ramping to 510A set point which should be around 490 RD.  (see heating profile for details)

Tuesday, June 06, 2023, 22:02

ramped to 516 on RD 527 on set.  Will leave for 10 hours

OMEGA =1930 C

Wednesday, June 07, 2023, 06:32

OMEGA at 1950 C this morning.  Will continue heating.  Lowered to 1940 C as in experiment 1 this was the top temperature.

Wednesday, June 07, 2023, 07:40

OMEGA= 1940 C

IGP1=1.7-6 Torr

TGHT= 513A, 9.4V

starting ramp down at -2A/min

 Previous TP would only spin up to 4KRPM. New TP installed.

Monday, June 05, 2023, 14:50: Roughing. 

Monday, June 05, 2023, 15:10: Controller reset. TP on. 

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

Tuesday, May 02, 2023, 14:03

Two np-TiO2 spun fibrous pellets and 1 batch of fibre mats were wrapped with graphite foils and loaded into a target boat.

Sample will be heated to 1875C, similar to the previous process, see e-log ID#605 (TGHT: 440A/7.6V).

TGHT will be autoramped to 350 A and monitor the conditions before ramping up further.

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 1.08

In the previous process (ID#605), Ta-foil was inserted at both ends of the tubes to hold the sample together. However, it was observed that the out-gassing of the material reacted with the Ta-foil, causing issues. Therefore, it's decided not to cover the ends with Ta-foil, and the sensor is now looking at the graphite foil. It had previously determined the slope for SiC material set for its emissivity, but need to note any errors that may have arisen due to the change in the sample setup.

See attachment#1 for sample setup - note that Omega sensor is slightly looking at the edge of the Ta-boat tube. 

Initiate autoramp: 1 A/min

Chamber has been pumped down below 5.6e-6 Torr.

 Tuesday, May 02, 2023, 15:31

Vacuum spike TGHT at 75A, auto-ramping down kicked in.

 Wednesday, May 03, 2023, 12:18Thursday, May 04, 2023, 15:16

TGHT has been holding at 350A/5.7V (1995W) for almost 2hrs, temp is reading at 1368C - 232C lower than the previous process (ID#605) with TGHT = 348/5.8V (2018W).

Pressure started to come down around 344A/5.5V, temp 1331C - see attachment #2.

Current status overall view - see attachment #3

Continue to ramp up t0 440A at 1A/min and monitor.

 Wednesday, May 03, 2023, 14:47

TGHT reached 440A/7.5V, temp reading at 1672C.  Pressure is coming down, currently at 1.8e-6 Torr.  Will keep at this setting overnight and will check the Omega/emmissivity to confirm the temperature.

 Thursday, May 04, 2023, 10:54

Eractic vacuum spikes started just over 3 hrs ago.  Temp at 1681 C; TGHT has been stable at 440A/7.6V. Pressure ranging between 5.0e-7 to 1.5 e-6 and gradually decreasing, see attachment #4. 

Will perform the omega/emmissivity measurement.

 Thursday, May 04, 2023, 15:16

Temperature was checked with the digital and analogue pyrometers. 

With the analogue pyrometer on the Ta-container (left end, top surface), measured temp = 1360 C, with e=0.22, correction + 200 C => 1560 C

With the Omega pyrometer (right end), 1-color mode with e= 0.22, temp = 1585 C. 

Setting Omega pyrometer to 2-color mode with e= 0.99 temp = 1516 C --  this is in agreement with the measurements for Ta.  Note that the pyrometer is looking at some part of the Ta container which is not covered by the sample wrapped with the graphite foil (see attachment #5). 

From e-log#596, temp was reported at 1520 C (slope at 0.99) with a Ta-foil at the end of the tube, but from e-log#605, temp was reported at 1864 C (slope at 0.99) - possibly an error occurred during that time.

In conclusion, the temp should be at 1530 C +/- 10C with TGHT = 440A/7.7V (3388W).

 Thursday, May 04, 2023, 15:43

Vacuum spikes continue every 30 min lasting for 10 min. 

Tapped down TGHT to 430A/7.5V, temp reading at 1500 C.  Will monitor if any improvement with the vacuum.

 Friday, May 05, 2023, 09:34

Vacuum spikes continue to happen; see attachment #6 for the striptool overview.

Lower TGHT to 420A/7.3V, temp = 1480 C.

 Friday, May 05, 2023, 10:10

Vacuum spikes continue every 20-30 min lasting for 10 min. 

Lower TGHT to 410A/7.1V, temp = 1450 C

 Friday, May 05, 2023, 11:25

Vacuum spikes continue,

Lower TGHT to 400A/6.93V, temp = 1433 C

 Friday, May 05, 2023, 12:20

Vacuum spikes - lower TGHT to 390A/6.7V, temp at 1407C

Friday, May 05, 2023, 13:19

Vacuum spikes - lower TGHT to 380A/6.5V, temp at 1388C

Friday, May 05, 2023, 13:47

Vacuum spikes - lower TGHT to 370A/6.3V, temp at1373 C

Friday, May 05, 2023, 14:16

Vacuum spikes - lower TGHT 360A/6.1V, temp at 1348 C

Friday, May 05, 2023, 15:11

Vacuum spikes - lower TGHT 350A/5.9V, temp at 1308 C

Friday, May 05, 2023, 16:34

Vacuum spikes - lower TGHT 340A/5.7V, temp at 1371 C

Friday, May 05, 2023, 16:56

Vacuum spikes continue; container possibly broken.

Slow ramp down TGHT at -0.5A/min to see when the vacuum spikes would stop.

 Monday, May 08, 2023, 09:54

TGHT was ramped down over the weekend.  Chamber was kept under vacuum and vacuum continued to spike; suspecting problem with the gauge?! see attachment &7 for an over view.

Will take out the samples for exam.

Friday, April 28, 2023, 11:29

loaded 14 TaC coated end caps and 2 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

 2 end caps had slight damage and were disposed of.  12 good caps and 2 good springs.

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

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.

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

 Reached 550A on TGHT (paused there until I realized it was stopped) then resumed ramping to 580A at 0.2A/min. Saw both vacuum spikes before 550A. Attaching screenshot from John.

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

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.   

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, 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 -- 5.0e-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.

Sunday, April 23, 2023, 07:23

The coated container was wrapped in 3 Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~450A (adjustable)

Good vacuum = 5.0 e-04Torr

Bad vacuum = 5.0E-02 Torr

Interlock tripped (HS water flow, SP6, GE, CHIL <--supposed to be bypassed)

 Monday, April 24, 2023, 13:24

In the morning Carla found some loose wires behind EVAP 2. Wires connecting the flow-meter.  The interlock problem was fixed as it was noted there was normal HS water flow.

Started ramp up at 1A/min to 230 A.  The first outgassing bump observed and wil start autoramp @ 2A/min on both TGHT and TBHT (target is 400A on TGHT and 230A on TBHT).

Monday, April 24, 2023, 16:24

Reached 480A on TGHT at 4 pm.  Manually tapped to 500 A on TGHT , OMEGA=1853C.  Will keep until 8 pm.

Monday, April 24, 2023, 19:56

OMEGA= 1853 C

IGP1= 1.5e-06 Torr

TGHT = 500A, 8.5V

TBHT= 230A, 3.1V

rampdown TGHT @-2A/min and TBHT @ -1A/min

Thursday, April 20, 2023, 06:59

The coated container was wrapped in 3 Ta foil heatshields.

Target temperature on OMEGA= 1830-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Thursday, April 20, 2023, 07:02

Started TBHT and TBHT ramp at 1A/min to 230A

Thursday, April 20, 2023, 09:55

From 170 A started ramping at 2A/min to 230 A on both TGHT and TBHT

Thursday, April 20, 2023, 10:27

Starting ramp on TGHT to 300A, TBHT kept at 230A, 3.0 V

Thursday, April 20, 2023, 11:19

ramping at 4A/min (2A/30s) to 340 A on TGHT

Thursday, April 20, 2023, 11:40

After plot, ramping @ 2A/min to 460A on TGHT expected to reeach at 1245.  4 hours at 4:45 pm

Thursday, April 20, 2023, 13:44

Note that top temperature was 1835C @  480 A, 7.9V

Thursday, April 20, 2023, 17:00

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

Monday, April 24, 2023, 13:35

The coating is not as good as expected.  Maybe too much time between coating and sintering.  Will not use for TiC target.

Tuesday, April 18, 2023, 06:46

The coated container was wrapped in four Ta foil heatshields.

Target temperature on OMEGA= 1830-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02Torr

Tuesday, April 18, 2023, 06:47

IGP1 initial = 3.80e-07 Torr

Start ramp up at 2A min to 230 on both TBHT and TGHT

Tuesday, April 18, 2023, 09:43

Autoramping TGHT to 380 A @4/min (2/A 30s)

Tuesday, April 18, 2023, 10:36

manually ramped to 416A, 6.8 V on TGHT

TBHT = 230 A, 4.0V

Holding here for 4 hours.

OMEGA = 1863 c

Tuesday, April 18, 2023, 11:26

increased current on TGHT to 418 because temperature had slipped below 1850 C

Tuesday, April 18, 2023, 14:52

ramping down @-2A/min TGHT and -1A/min TBHT

Sunday, April 16, 2023, 14:08

The coated container was wrapped in four Ta foil heatshields.

Target temperature on OMEGA= 1860-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= 230A

Final TGHT current= ~400A (adjustable)

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Ramped at 2A/min to 230 A on both TGHT and TBHT.

Then ramped @4A/min to 385 A on TGHT.  Then ramped manually to 1850 C

Sunday, April 16, 2023, 18:31

At 428A reached 1830C on OMEGA

Sunday, April 16, 2023, 22:24

Start ramp down @ -2A/min TGHT and -1A/min TBHT

Wednesday, April 12, 2023, 09:53

The coated container was wrapped in 3 Ta foil heatshields.

Target temperature on OMEGA= 1850-1900 C

OMEGA slope:= 0.990

Target time at max temperature = 4 hours

Final Current TBHT= N/A

Final TGHT current= ~400A (adjustable)

Heating autoramp starged at 4A/min on  TGHT  40A

Then at 2A/min  to 90 A.

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

 IGP1 initial = 4.7e-07 Torr

Wednesday, April 12, 2023, 10:46

heating at 2A/min to 90A

Wednesday, April 12, 2023, 11:18

Autoramping at 2A/min to 230A

Wednesday, April 12, 2023, 11:53

Autoramping at 4A/min to 230 A

Wednesday, April 12, 2023, 13:57

Autoramping to 380A

Wednesday, April 12, 2023, 14:07

manually adjusted TGHT to 384A. 6.6 V

OMEGA reads 1859 C.   Leaving for 4 hours. 

Wednesday, April 12, 2023, 18:36

Started rampdown at -2A/min