1st test polarity 1

10:12 am Begin pumping down to rough vacuum
12:50 pm begin ramping up towards 2000C. Ta tube only, welded thermocouple mount
3:08 Ta tube reached 2000C, began ramping down. The ramping up process was smooth and no hiccups happened
4:57 ramp down complete, began shutting down the evap2, will let the turbopump to slow down spin overnight.

2nd test polarity 2(swapped)

Tuesday, Aug 09 2022, 4pm begin pumping to vacuum after switching the polarity of the power supply

Wednesday, August 10, 2022, 13:09 begin ramping up

3:18 ramped to 671A. 2000C, no hiccups, everything is nominal. The thermocouple reads higher than before, about 20-30 deg C colder than pyro at high temperatures (1400C and above)

No bad connections, short circuits or unexpected overheating.

begin ramping down

ramping down was smooth, with error being the TC about 40 deg C colder than pyro at temp above 1500C

ramping done completed at Wednesday, August 10, 2022, 16:46 , shutting down evap 2 roughing and turbopump

Wednesday, September 14, 2022, 9:30

A Ta container tube was wrapped with 3 Ta heatshields.

322 graphite discs were loaded.

one Tantalum cup (modified to fit losely) was inserted on the front end along with a Ta spring.

A Ta spring was also installed on the back end to maintain the discs inside the tube.

The system was left to establish vacuum over night.

Good vacuum set to5e-03Torr

Bad vacuum was set to 5e-2 Torr

Total weight of system including springs = 249.63 g

Two Ta foils were installed on the copper heatshield facing the ends of the container.

The initial weight of the front Ta foil = 22.5 g

The initial weight of the back Ta foil will be determined by difference after cleaning =

OMEGA slope = 0.99

The target will be heated to 2100 C, held there for 10 hours.  The target will be removed, the end Ta foils will be removed to analyses, new Ta end foils will be installed and the Target will be heated to 2100 plus 10 A higher than previous and left at that temperature for 2 hours.

Wednesday, September 14, 2022, 9:47

IGP1= 4.57e--7 Torr

initial Utoramp at 1A/10s to 80A and held at 80 amps until pressure good.

 Wednesday, September 14, 2022, 11:54

Start autoramp at 1A/20s to 120A

 Wednesday, September 14, 2022, 12:22

Autoramp at 1A/20s to 200A

Wednesday, September 14, 2022, 12:34

Autoramp increased to 2A/20s when TGHT = 154A

Wednesday, September 14, 2022, 13:46

 Autoramping to 512A as projected current for 2100 C

 Wednesday, September 14, 2022, 14:24

OMEGA = 1945 C @ 512A

Tapped to 540A, 10.5V and OMEGA = 2075. Will leave at this current and see Temperature behaeviour.

After 10 min OMEGA reads 2080C.  Will start cooling at 12:20 am

Wednesday, September 14, 2022, 14:29

OMEGA = 2104C will ramp down slightly to keep 2100C

Wednesday, September 14, 2022, 14:31

OMEGA = 2098 @ 530A, 10.4V

Wednesday, September 14, 2022, 14:33

OMEGA = 2100 @ 410A,9.8V

Wednesday, September 14, 2022, 14:45

OMEGA = 2093 at 500A, 9.75V

Wednesday, September 14, 2022, 15:07

497A, 9.6V, OMEGA 2100

Wednesday, September 14, 2022, 22:09

@ approximately 515 pm noticed that OMEGA was reading 1600 C while TGHT was at 497A and 10.0V

Suspect damage to the container and possible damage

Left at the same current.

Just now the OMEGA is reading 2200C at 497A and 9.7V.  Out of precaution, lowered the current to 475A and the volatage is 9.2V

OMEGA now reads 2152 C.  Will leave at this current until 12:30 am when the 10 hour heating will end and will start rampdown at -2A/min

Thursday, September 15, 2022, 00:05

TGHT= 475A, 9.2V

OMEGA= 2126 C

IGP1= 1.33e-6 Torr

lowered current to 470A, 9.1 V, IGP1= 1.3e-6 Torr, OMEGA stabilized at 2120C

Thursday, September 15, 2022, 00:09

IGP1= 1.3e-6 Torr

will increase 10A to see pressure response. OMEGA= 2130C

Increase in IGP1 to 1.4e-6 Torr observed but immediately started to trend down

Thursday, September 15, 2022, 00:16

IGP1= 1.36e-6 Torr

OMEGA = 2131A

TGHT = 480 A

Thursday, September 15, 2022, 00:18

Start ramp down at -2A/min

Thursday, September 15, 2022, 09:45

IGP1=4.35e-07 Torr

TGHT turned off

Starting dismounting of target tube

Thursday, September 22, 2022, 07:04

Container tube was crystalized and was easily cut with a small pair of nail scissors.  All but 18 discs were transferred to a new container.  WO# 44691-3

Thursday, September 22, 2022, 07:13

Each endcap is separated with a disc of graphite foil and rolled into 3 packs of 4 within a foil envelope in a target boat.

There are also 2 coated springs

The boat is wrapped with 3-layers of Ta heatshields.

Chamber pumped down over previous night

Good vacuum = 5.0e-04 Torr

bad vacuum = 5.e-02 Torr

OMEGA slope = 0.99

Will ramp TGHT up to 40 A then autoramp to 400A at 1A/min.

Final desired temperature on OMEGA (tap)= 1800C

IGP1= 3.8e-7 Torr

Thursday, September 22, 2022, 10:08

TGHT= 168A,

IGP1= 4.7E-07=6Torr

Increased  ramp to 2A/min

Thursday, September 22, 2022, 12:08

TGHT= 400A, 6.7V

OMEGA= 1604C

Continuing autoramp to 450A @2A/min

Thursday, September 22, 2022, 12:36

TGHT=450A, 7.7V

OMEGA=1700C

Tapping to 1800C manually

Thursday, September 22, 2022, 12:54

OMEGA = 1750C at 505A, 8.8 V 

Tapped to 540A, 9.5V

Will leave there for two more hours

OMEGA= 1800+/- 10 C

Thursday, September 22, 2022, 15:00

TGHT = 540A, 9.3V

OMEGA= 1713

start rampdown at-2A/min
 

Friday, September 23, 2022, 09:49

IGP1= 4.0e-7 Torr

Will dismount container

Saturday, September 24, 2022, 09:10

Endcaps looked good.  The front spring sintered onto container and not usable.  signs of overheating.

Tuesday, November 01, 2022, 17:24

2 samples of np-TiO2/C fibres were produced using the e-spinner.  Each sample was wrapped with a piece of graphite sheet, and then loaded into a target container. 

Sample will be heated to 1700 C.

TGHT will be autoramped to 450 A; this should be close to 1600 C. (see elog#596)

Good vacuum: 3e-5 Torr

Bad vacuum: 5e-5 Torr

Omega slope: 0.99

Initiate autoramp: 1 A/min

Chamber has been pumped down below 4.2e-6 Torr.

 Tuesday, November 01, 2022, 22:46

 Pressure currently at 6.4e-7 Torr.

Initiated auto-ramping

 Wednesday, November 02, 2022, 09:37

TGHT was ramped up to 448A (readback 445-452A / 8.05V - 8.11V).  The voltage is much higher than the last process, see elog #596.

Temperature is much higher at this current, reading at 1870 - 1872 C. 

Will keep at this setting for now and continue to monitor.

See attachment#1 for the TGHT-Pressure plot.

 Wednesday, November 02, 2022, 21:35

Samples have been heated for over 16 hours; temp has been stabilized at 1875 C, vacuum at 7.3 e-7 Torr. 

Initiated cooling at 1A/min.

Chamber will be vented tomorrow morning.

Thursday, November 24, 2022, 11:01

Target container contains one disc of e-spun TiO2/PAN fibrous disc, (Ref sample P-134).

Sample will be heated to 1875C, similar to the previous process, see e-log ID#599.

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: 0.99

Initiate autoramp: 1 A/min

Chamber has been pumped down below 5.0e-6 Torr.

 Friday, November 25, 2022, 08:38

TGHT reached to 348A/5.8V; temp is holding at 1600 C since 19:00 yesterday, see attachment#1.

Stepping up TGHT to 400A and continue to monitor.

 Friday, November 25, 2022, 09:45

TGHT reached to 400A/6.8V; temp holding at 1758C.  Pressure coming down from 6.6e-7 Torr.

Ramping up to 410A.

 Friday, November 25, 2022, 12:28

TGHT reached 410A/7.08V.  temp holding at 1790 C.  Pressure coming down from 6.9e-7 Torr. 

Ramping up to 430A.

 Friday, November 25, 2022, 13:01

TGHT reached 430A/7.4V. Temp holding at 1837 C.  Pressure coming down from 7.73e-7 Torr.

Ramping up to 440A.

 Friday, November 25, 2022, 13:50

TGHT reached to 440A/7.6V.  Temp holding at 1864C.  Tapping TGHT to 444A (readback 443A - 449 A)/7.7V. 

Desired Temp has reached, 1875 C.  Will continue to hold on this temp over the weekend.

 Sunday, November 27, 2022, 21:14

TGHT has been holding at 442A (lowered by 2 A on Fri to maintain 1875C).  Temp increased to 1887C.  Pressure at 2.5e-7 Torr. 

See attachment#2 for plots/temp. 

Initiated cooling at 1A/min.

4 TaC coated springs and 4 Tac coated caps loaded into a target boat.

Target boat wrapped in 4 Ta heatshields

Target boat type was with endcaps at both ends.

Left in Evap2 over previous night to depressurize.

Target temperature= 1850-1900C for 4 hours

Good vacuum = 5e-04 Torr

Bad vacuum = 5e-02 Torr

Friday, December 16, 2022, 10:01

Heated @1A/min to 100A on TGHT

Then heated 2A/min to 120A

Friday, December 16, 2022, 10:08

started autoramp @4A/min  to 300A

Friday, December 16, 2022, 11:15

TGHT=450 A, 7.6 V

OMEGA= 1863 C

IGP1= 7.2e-06 Torr

Will keep for 4 hours

Monday, December 19, 2022, 10:30

Sintering was perfect.  Repeat same configuration next time.

Thursday, February 09, 2023, 09:47

Target boat with a layer of niobium foil on the bottom is used to heat up Nb samples to 1400 C for 4 hrs.

The niobium samples are wrapped in a Nb foil.

Boat is wrapped with 2 layers of Ta foil, careful to avoid touching samples.

Samples left in Evap2 overnight (pumping down).

Good vacuum = 5.0e-04 Torr

Bad vacuum = 5.0e-02 Torr

Thursday, February 09, 2023, 09:48

IGP1= 6.19e-07 Torr

Autoramping to 100A @1A/min

Thursday, February 09, 2023, 09:57

Vacuum stable. ramp at 6A/min to 50 A instead

Thursday, February 09, 2023, 10:09

ramping at 2A/min to 100A

Thursday, February 09, 2023, 11:29

1400C on OMEGA reached @ 341A, 5.5V  Will stop and watch until stable

Thursday, February 09, 2023, 15:29

OMEGA= 1408 C

IGP1= 7.97e-07 Torr

Start rampdown @ -1A/min

Thursday, March 09, 2023, 06:53

2 TaC coated springs and  12 Tac coated caps loaded into a target boat (in packs of 4 wrapped in graphite foil).

Target boat wrapped in 4 Ta heatshields

Target boat type was with endcaps at both ends.

Left in Evap2 over previous night to depressurize.

Target temperature= 1850-1900C for 4 hours

Good vacuum = 5e-04 Torr

Bad vacuum = 5e-02 Torr

Start autoramp at 2A/min to 50A on  TGHT

 Thursday, March 09, 2023, 07:22

at 44A switched ramping rate to 1A/min to 120 A

Thursday, March 09, 2023, 09:53

ramping at 4A/min (2A/30s) to 400A

IGP1= 9.9e-07 Torr

Thursday, March 09, 2023, 11:26

1130 am  reaching 425A on TGHT 

1850 C OMEGA

Thursday, March 09, 2023, 15:37

TGHT 425 A, 7.1V

OMEGA = 1850 C

Starting rampdown @ -2A/min

endcaps and spring looked really good.

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

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.

 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. 

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)

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

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

Tuesday, May 07, 2024, 06:16

TP was swapped on previous day (May 6th)

protective screen installed.

Loaded 9 TaC coated end caps (groups of 4 and 5) 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

 Initial IGP1=6.7E-07 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.