Monday, November 08, 2021, 09:35

Two groups of 4 caps wrapped in graphite with graphite discs in between. 

Two TaC coated springs at either end of the boat.

Target temperature = 1800 C

Expected around 430 TGHT

Good Vacuum 3e-03 Torr

Bad Vacuum 5e-02 Torr

Evap two was left pressuring down over weekend.

Monday, November 08, 2021, 09:35

Starting autoramp to 40 A at 1A/min

TGHT = 2.5e-07 Torr

Monday, November 08, 2021, 10:57

IGP1 = 8.5e -06 Torr and dropping

set autoramp to 50A at 1A/min

IGP1 1.0e-05 Torr and dropping

Set TGHT to autoramp to 90 A @ 1A/min and leave until pressure below 9e-06 Torr

Monday, November 08, 2021, 15:09

IGP1= 9.6e-06 Torr

Start autoramp to 400A at 2A/min 

Monday, November 08, 2021, 17:37

TGHT = 377 A, 6.1V

OMEGA= 1234 C

Monday, November 08, 2021, 17:58

OMEGA = 1292 (cannot trust )

400A, 6.3 V

1.4 e-05 Torr

 Autoramp @ 1A/min to 425A

Will heat to 425A and keep there for four hours

Monday, November 08, 2021, 22:02

TGHT=420A, 6.7V

IGP1= 7.0e-06 Torr

Start ramp down at -2A/min 

 The Helicoil had mostly pulled out of the old one.

Thursday, November 25, 2021, 13:58: Insulator replaced. EVAP 2 is ready for use with ISAC targets.

Wednesday, February 09, 2022, 06:55 

Target boat with a layer of niobium foil on the bottom used to heat up Nb samples to 1100 C for 4 hrs.

OMEGA slope = 0.99

The niobium samples are wrapped in a layer of  Nb foil.

Boat is wrapped with 2 layers of Nb foil.

Good vacuum 3.00e-02 Torr

Bad vacuum 5.00e-02 Torr

Autoramping TGHT at 3A/min to 180A, then monitor until desired temperature (based on eLog 550)

Initial IGP1=9.9e-07 Torr

Wednesday, February 09, 2022, 08:00

TGHT = 225 A, 3.2V

IGP1=  1.17e-06 Torr

OMEGA= 1100C +/- 12C fluctuations 

Wednesday, February 09, 2022, 11:55

TGHT=  225 A, 3.3 V

IGP1= 9.7e-07 Torr

OMEGA=1100C +/- 10C fluctuations

Wednesday, February 09, 2022, 11:56

Start cooling @-2A/min 

Thursday, February 10, 2022, 08:52 

Total number of foils: 528 ( including 10 analysis discs)

Weight without springs = 1521.9 g (includes heatshields and T bar)

Total length packed 18.1 cm (including 10 analysis discs that will be removed)

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  ends

Initially to ramp TGHT and TBHT to 50A at0.5 A/min

Then heat automatically heat to OMEGA ~1400 C , then continue to max 530A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 1.0 e-06 Torr at start of initial ramp

IGP1 = 5.7 e-06 Torr

TGHT = 50.0 A, 0.6 V

TBHT = 50.0A, 0.5 V

continue to ramp up at 0.5A/min to 200A

Friday, February 11, 2022, 07:59 

IGP1=3.0e-07 Torr and stable

TGHT= 201A, 2.8V

TBHT = 201A, 2.6V

continue autoramp at 1A/min to 230A on TBHT and 450A on TGHT

Friday, February 11, 2022, 12:41

IGP1= 6.6e-05 Torr

TGHT= 450A, 6.5V

TBHT= 232A, 3.1V

OMEGA = 1258C

Allowing pressure to drop.  Will continue ramp up when [pressure around 9-e-6 Torr

Friday, February 11, 2022, 13:59

IGP1= 2.4e-05 Torr

Will ramp up at 1A/min to 550A on TGHT

Friday, February 11, 2022, 15:54  

IGP1= 2.4e-05 Torr

TGHT= 551.0A, 8.3V

TBHT=232A, 3.2V

OMEGA= 1426 C

ramp to 600 A @ 2A/min

Friday, February 11, 2022, 16:23

TGHT= 600.1A, 9.3V

TBHT= 232A, 3.2V

OMEGA = 1612C

ramp to 689 @2A/min to 1800 C as projected in regression plot attached 

Friday, February 11, 2022, 21:20 

Evap has been at 1800 +/- 20 C for 4 hours and 10 minutes

OMEGA 1802 C

TGHT = 689 A, 11.0V

TBHT=232.8 A, 3.26V

IGP1= 1.3e-05 Torr and stabilizing.  

will start cool down at -2A/min TGHT and -1A/min TBHT

Wednesday, February 09, 2022, 06:55 

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

OMEGA slope = 0.99

The niobium samples are wrapped in a layer of  Nb foil.

Boat is wrapped with 2 layers of Nb foil.

Good vacuum 3.00e-02 Torr

Bad vacuum 5.00e-02 Torr

Autoramping TGHT at 2A/min to 200A, then monitor until desired temperature

Initial IGP1=6.0e-06 Torr

Tuesday, February 15, 2022, 12:44

Increasing ramp up to 3A/min to 220 A as pressure very stable

Tuesday, February 15, 2022, 14:04

ramped up manually to 1400C

IGP1 =3.9 e-06 Torr

TGHT = 340A, 5.5V

OMEGA = 1400 C

Tuesday, February 15, 2022, 14:21

Temperature on OMEGA up to 1413 C

Lowering current to 332A , OMEGA = 1400 +/- 5C

Wednesday, February 16, 2022, 11:43

On Tuesday February15, 2020 @18:04 started ramp down @-3A/min

Old HS sprang a leak in the copper tubing.  

HS#44378-15

Tuesday, April 12, 2022, 13:35: Roughing. 

Tuesday, April 12, 2022, 13:49: TP1 switched on. 

Tuesday, April 12, 2022, 13:57: TP1 stable (green).

Tuesday, April 12, 2022, 14:10: Vacuum @ 3.71e-05T & dropping.

Tuesday, April 12, 2022, 14:11: HS waterline opened. 

Tuesday, April 12, 2022, 14:12: Vacuum @ 3.32e-05T.

Tuesday, April 12, 2022, 14:22: Vacuum @ 2.19e-05T (Stable).

 Tuesday, May 10, 2022, 14:42: TV551 Varian. SN: 202311 (Slightly active from BL1A - will not cross contaminate. Field only - Tagged) was removed as it was meant to be a temporary fix. Replacement (Refurbished) pump is to be installed. (Tomorrow - Use slow start function as per vacuum group) 

Thursday, May 12, 2022, 13:30: Agilent TP & hardware installed.

SN: IT21381010 

Thursday, May 12, 2022, 13:41: Roughing.

Thursday, May 12, 2022, 13:46: Halt. 

Friday, May 13, 2022, 07:05: Roughing. 

Friday, May 13, 2022, 07:18: TP1 on.

Friday, May 13, 2022, 07:23: Up to 14 KRPM. Pause/Halted startup (Whining?). Slow start w/ vacuum group.

Process to perform a TP slow start:

- Hold both top buttons on the controller for about 3 seconds

- Right Yes/No left to continue. 

- Advance to soft start - 20 min. 

- Back to remote start & go.

Friday, May 13, 2022, 08:26: TP1 on w/ slow start.

Friday, May 13, 2022, 08:39: 13 KRPM & climbing.

Friday, May 13, 2022, 09:10: TP at full speed. 38 KRPM. 0.5A 9w. This pump whines, but is operating fine. Likely will switch again when another is available. (It appears to have been dropped, Noted by Edi. Likely when shipped) 

Friday, May 13, 2022, 09:14: TP off. Slow start function off. Back to normal function. 

Thursday, June 09, 2022, 09:07

Yesterday, Wednesday June 08, 2022 @ ~3.00 pm a "dummy" target container was installed in EVAP 2 after the heatshield assembly had been swapped.

The purpose is to test correct functioning of the system.  Melting and evaporation on one of the bolts of the previous target container (eLog578) prompted the change in heatshield assembly and current testing.

TGHT was ramped up to 740A @ 4A/min, left to run at the final current for ~4.5 hours and then ramped down @-2A/min to 0A.

Will dismount dummy container this morning.

IGP1=2.5e-07 Torr

Thursday, June 09, 2022, 11:16

The target appears in good shape.  No abnormal behaviour. 

Picture attached are of the previous failed target eLog 578

Monday, June 20, 2022, 14:50

A new Turbo pump was installed this morning and it was soft started.  It has operated correctly and it is ready for use.  Derek O.  installed it.

Previous pump had issues at start-up and was diagnosed as finished by Edi/

 11am: Setting up new target tube thermocouple test

Thursday, August 04, 2022, 09:31 Test finished August 3rd afternoon. Venting now.  

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.