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

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

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

Monday, September 09, 2024, 19:06

The coated container was wrapped in 4 Ta foil heatshields.

Vacuum IGP1 initial =2.6 e-06 Torr

Target temperature on OMEGA= 1800-1900 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   and TBHT until outgassin peak passed

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

Good vacuum = 5.0 e-04 Torr

Bad vacuum = 5.0E-02 Torr

Monday, September 09, 2024, 19:08

Peak passed around 70A will continue ramp up at 1A/min to 400A on TGHT and 230A TBHT

Tuesday, September 10, 2024, 13:13

Was ramped down at -2 A/min TGHT and -1 A/min TBHT

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.

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. 

Monday, August 19, 2024, 13:06

Target container consists of 2 samples, and both samples were heat stabilized at 150 C for 24 hours then pre-oxidized at 360 C for 4 hours:

1.  PVP (7% wt/v) spun fibres 0.0569 g

2.  np-Ta (Dope 7) spun fibres: 0.1730 g

Samples are wrapped in graphite foil and loaded into a target boat which is wrapped with Ta foil.

Omega slope set at 0.99.

Similar heat treatment as the 1st attempt, see e-log #667 (1800 C = 402A/7.2V).

Good vac = 3 e-5 Torr

Bad vac = 5 e-5 Torr.

Chamber is currently pumping down.

 Monday, August 19, 2024, 16:52

Chamber pressure @ 4.6e-6 Torr.

Initiate auto-ramping at 1A/min to reach 400A.

Continue to monitor the pressure and TGHT.

Tuesday, August 20, 2024, 09:48

TGHT reached 400 A/6.87V about 10 hr ago.  But the temperature has been holding at 1665 C. 

The voltage is much lower this time compared to the previous heat treatment.  See attachment #1 for the overall process.

Ramping up to 450A.  Continue monitoring..

Tuesday, August 20, 2024, 15:43

TGHT at 450A (readback 441A)/7.892V, temperature holding at 1803C

Pressure coming down from 1.62e-6 Torr. 

Continue to hold on the temperature for a few more hours before cooling it down

 Wednesday, August 21, 2024, 09:40

Temperature was holding for about 18 hours before ramping down TGHT was initiated at 2A/min.

The samples can be taken out after 2 pm.

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

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.

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

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

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.

Angelina Chen wrote:

Thursday, July 25, 2024, 15:18 Target container consists of two np-Ta fibres disk samples. Both disks are made from heat stabilized np-Ta fibres (150 C for 17 hours) and were pressed at 8 tons / 300 MPa. Sample 1 was made from np-Ta fibres spun using Dope solution #1. The sample 1 disk has an average thickness of 0.727 mm and a diameter of 17.113 mm. The mass of the green sample 1 disk is 0.1957 g.  Sample 2 was made from np-Ta fibres spun using Dope solution #6. The sample 2 disk has an average thickness of 0.688 mm and a diameter of 17.123 mm. The mass of the heat stabilized fibres used to make the green sample 2 disk is 0.1860 g. The mass loss from pressing the heat stabilized fibres was virtually zero. Therefore, while the mass of the green sample 2 disk was not measured, it can be extrapolated to be 0.1860 g.  The target container was wrapped with Ta foil. Each sample disk was wrapped in graphite foil and placed inside the target container horizontally near the center.  The Omega slope was initially set to 0.980. After reviewing previous logbook on np-Ti The chamber is currently being pumped down. The current reading (as of 15:40) is 4.70e-05 Torr.  Two heating schedules will be tested. Heating schedule 1 entails heating both sample disks at ~1000 C until the pressure reaches below 1.00e-06 Torr. Once heating schedule 1 is completed, sample 1 will be removed. Heating schedule 2 entails heating sample 2 to ~1800 C until the pressure reaches below 1.00e-06 Torr. TGHT is estimated to be approximately 440A/7.6V to reach 1875 C (348A/5.8V to hold temperature at 1600 C). Refer to e-log ID#605.

 Friday, July 26, 2024, 09:52

Chamber has been pumped down overnight, pressure currently at 1e-6 Torr.

Initiate auto ramping 1A/min to reach 200 A. 

Good vac = 3 e-5 Torr

Bad vac = 5 e-5 Torr. 

Continue to monitor.

 Friday, July 26, 2024, 17:06

Gas evolution has seen observed to be completed as TGHT slowly ramping up.  Temp is currently reading at 1015 C, TGHT 164A/2.43V.  Pressure holding at 2.4e-6 Torr but slowly coming down, see attachment 1.  Will keep this setting and cool it down on Sunday.

 Sunday, July 28, 2024, 11:27

Temperature has been holding sturdy at ~1000C for over 36 hours, TGHT at 164A/2.59V (a slight increase in the voltage).  Pressure is currentlyat 4.5e-7 Torr (see attachment #2 for the archiver).

Ramping down TGHT at 1A/min. 

Will remove both samples on Monday to measure the mass loss.  Sample 1 will be analyzed.  Sample 2 will be loaded back to the Evap 2 for further heating to reach about 1800 C.

 Monday, July 29, 2024, 14:29

Both samples were removed from the chamber and measured for weight loss, and Sample 2 was put back for further heating; Thanks Darwin for helping up with this. 

Chamber is currently pump down, pressure at 6.0e-5 Torr. Will ramp up TGHT once the pressure has come down to 10e-6 Torr. 

 Monday, July 29, 2024, 16:52

Pressure at 6.5e-6 Torr.  Ramping up TGHT at 2A/min to reach 164A (previous setting at ~1000C).

 Tuesday, July 30, 2024, 09:02

Temperature has been holding at about 1000C. THGT at 160A(readback,, 164A setpoint)/2.56V.  Pressure 7e-7 Torr.

Stepping up 1A/min in 20A increment to reach 1800C. 

Continue to monitor.

 Tuesday, July 30, 2024, 10:07

Plotting out THGT (readback) vs Temp:

181 A/2.91V, 1070C

206A/3.34V, 1153C

225A/3.7V, 1213C

245A/4.1V, 1277C

Wednesday, July 31, 2024, 11:26

TGHT tripped off due to HS water flow NOT oK,  Attempted to clear it but did not work, see attachment #3. 

Will stop the process for now and investigate the problem. 

 Wednesday, July 31, 2024, 12:10

Darwin helped to check the surrounding of the lab for water leaks; everything was good and the chamber remained under vacuum. 

All the water paddle wheels were moving.  A slight touch of the HS paddle wheel somehow cleared the interlock. Maybe the connection was loose. 

We checked all the paddle wheels by shutting and opening the water valves.  All the interlocks responded correctly. 

Continue with the heating process...

Ramping up TGHT at 2A/min to reach 300A.

 Wednesday, July 31, 2024, 15:27

TGHT vs temp:

294A/5.1V 1477C

343A/6.0A, 1633C

402A/7.2V, 1818C

Will keep TGHT at 410A (setpoint) for night.(see attachment#4)

 Tuesday, August 06, 2024, 10:00

Venting Evap 2; the process is done.

The sample will be analyzed. 

 Thursday, July 25, 2024, 15:18

Target container consists of two np-Ta fibres disk samples. Both disks are made from heat stabilized np-Ta fibres (150 C for 17 hours) and were pressed at 8 tons / 300 MPa.

Sample 1 was made from np-Ta fibres spun using Dope solution #1. Sample 1 disk has an average thickness of 0.727 mm and a diameter of 17.113 mm. Mass of the green sample 1 disk is 0.1957 g. 

Sample 2 was made from np-Ta fibres spun using Dope solution #6. Sample 2 disk has an average thickness of 0.688 mm and a diameter of 17.123 mm. Mass of the heat stabilized fibres used to make the green sample 2 disk is 0.1860 g. Mass loss from pressing the heat stabilized fibres was virtually zero. Therefore, although the mass of the green sample 2 disk was not measured, it can be extrapolated to be 0.1860 g. 

Target container was wrapped with Ta foil. Each sample disk was wrapped in graphite foil and placed inside the target container horizontally near the center. 

Omega slope was initially set to 0.980. After reviewing previous logbook on np-Ti (e-log ID#633), changed the Omega slope to 0.990. 

Chamber is currently being pumped down. The current reading (as of 15:40) is 4.70e-05 Torr. 

Two heating schedules will be tested. Heating schedule 1 entails heating both sample disks at ~1000 C until the pressure reaches below 1.00e-06 Torr. Once heating schedule 1 is completed, sample 1 will be removed. Heating schedule 2 entails heating sample 2 to ~1800 C until the pressure reaches below 1.00e-06 Torr. TGHT is estimated to be approximately 440A/7.6V to reach 1875 C (348A/5.8V to hold temperature at 1600 C). Refer to e-log ID#605. 

 Ta#67 Thin foil LP-SIS target description: 

Total Ta foils = 470 loaded into 2 packs of 235 foils each.

Foil Thickness = 0.010mm (0.0004") avg Measured. 

Target material batch:  https://elog.triumf.ca/TIS/Target+Production/143

Target density = 4.498 g/cm3

Target length = 3.7465 cm

Total Mass = 16.8509 g [Incl foils + Ta wire on 2 packs]

Total mass w/ Target oven =  415g (No end caps)

Discs in target are arranged as follows: 2packs

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

No Ta foil heat shield added

Monday, July 22, 2024, 14:53: Roughing. 

Halt roughing. Install heat plates.

Monday, July 22, 2024, 15:06: Roughing.

Monday, July 22, 2024, 15:26: TP On.

Monday, July 22, 2024, 15:34: TP Timeout. Restart. 

Monday, July 22, 2024, 15:35: TP at speed (Green) 

Monday, July 22, 2024, 15:36: PS On. TGHT / TBHT to 5/5 A manually. OK. Tap down. 

Tuesday, July 23, 2024, 07:03: Auto-ramping TGHT / TBHT to 120 / 60 A @ 2 A per min. Desired temperature 1900 C.

Tuesday, July 23, 2024, 08:02: OMEGA IR2C Laser off. Slope set to 0.98. 

Tuesday, July 23, 2024, 08:06: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 A per min. 

Tuesday, July 23, 2024, 09:57: Auto-ramping TGHT / TBHT to 500 / 200 A @ 2 A per min. Temperature @ 1022 C. 

Tuesday, July 23, 2024, 11:59: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. Temperature @ 1538 C.

Tuesday, July 23, 2024, 12:46: TGHT / TBHT @ 580 / 230 A (569 / 233 A). Temperature @ 1710 C. Vacuum @ 7.44e-06T. 

Tuesday, July 23, 2024, 14:23: TGHT / TBHT @ 580 / 230 A (568 / 233 A). Auto-ramping TGHT to 620 A @ 2 A per min. Temperature @ 1721 C. Vacuum @ 5.06e-06T. 

Tuesday, July 23, 2024, 14:48: TGHT / TBHT @ 620 / 230 A 609 / 233 A). Auto-ramping TGHT to 630 A @ 2 A per min. Temperature @ 1799 C. Vacuum @ 6.76e-06T.  

Tuesday, July 23, 2024, 14:56:  TGHT / TBHT @ 630 / 230 A 618 / 233 A). Temperature @ 1816 C. Vacuum @ 7.14e-06T. Tapping up manually TGHT to get to 1900degC 

Tuesday, July 23, 2024, 15:23:  TGHT / TBHT @ 670 / 230 A 657 / 233 A).  Temperature @ 1890 C. Vacuum @ 9.94e-06T.  Stopping and waiting for 5min.

Tuesday, July 23, 2024, 15:39: Target ramp down 2A/min to 0 both TGHT and TBHT. 

Wednesday, July 24, 2024, 08:50: TP off.

Wednesday, July 24, 2024, 09:18: Venting.

Wednesday, July 24, 2024, 10:28: Target removed. EVAP2 clear. 

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

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, 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.

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

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.