Laura Lambert wrote:

Wednesday, May 25, 2016, 11:37 Container coated with TaC using 'flushing technique' [cleaned ionizer tube with acetone, so no coating inside ionizer tube] Wrapped with 2 x Ta heat shields - one full height of Ta foil wrapped around cooling fins twice Currently pumping down in evap2  Thursday, May 26, 2016, 09:28 Tapped up manually to 40A IGP1 = 6.6e-7 Torr Initiating auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively. Final setpoints for TGHT = 650A and TBHT = 230A Once max setpoints reached will continue to tap up manually while monitoring temperature to 1900C

 Tuesday, May 31, 2016, 11:09

TGHT at 615A/9.08V, temp = 1610C.  Vacuum at 1.8e-7 Torr. 

Tapping up TGHT to reach 1900C

 Tuesday, May 31, 2016, 12:04

TGHT at 765A/11.90V.  Temp at 1900C.  Pressure is coming down from 8.7e-7Torr. 

Will keep at this temperature for a day.

 Wednesday, June 01, 2016, 15:22

Temperature has been stable at 1900C.  Pressure is coming down from 3.4e-7 Torr. 

Cooling down TGHT and TBHT at 2A/min and 1A/min, respectively.

 Friday, June 03, 2016, 12:10

TGHT/TBHT at 0A.  Target can be remained under vacuum until Monday.

 Monday, June 06, 2016, 16:54

Target container was inspected; it looks good

 Friday, February 12, 2016, 11:01

Container coated with TaC with new method - ends tapped off,  liquid poured/swirled around container, then poured back out - 'flushing technique'.

Container wrapped with 3 x Ta heat shields, incl center block - new method of each layer being one long single Ta foil covering entire container incl center block

IGP1 = 6.3e-7Torr

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~20min.

Vacuum stable, IGP1 = 1.3e-6 Torr.

Initiated auto-ramp at 0.2A/min and 0.1A/min for the TGHT and TBHT respectively with final setpoints of 400A and 230A.

 Monday, February 15, 2016, 08:56

IGP1 = 3.9e-7 Torr.

TBHT = 230A, 4.0V

TGHT = 400A, 6.58V

OMEGA = 1766C

Tapping up manually to 1900C...

 Monday, February 15, 2016, 10:18

IGP1 = 5e-7 Torr

TGHT = 450A, 7.55V

OMEGA = 1913C

 Monday, February 15, 2016, 14:30

IGP1 = 4.9e-7 Torr.

TGHT = 450A, 7.55V.

Material remained at ~1910C for ~4hrs.

Initiating auto-cool at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

 Tuesday, February 16, 2016, 14:17

vented in air and opened up this morning.

target container sintered nicely.

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

 Tuesday, February 16, 2016, 14:19

coated with TaC yesterday and let dry overnight.

wrapped with one long Ta heat shield - wrapped around tube 3x, with Ta wire to offset Ta foil away from container

loaded into evap2 and currently pumping down.

 Wednesday, February 17, 2016, 10:51

HS water valves opened, no leaks detected.

Tapped up manually to 35A.

Waited ~20min, vacuum stable.

IGP1 = 5.9e-7 Torr.

Initiating auto-ramp at 0.2A/min to a final setpoint of 400A.

Final desired temperature = 1900C

 Thursday, February 18, 2016, 09:16

IGP1 = 6.6e-7 Torr.

TGHT = 303A, 4.3V

OMEGA = 1311C

Increasing ramping rate to 1.0A/min.

Laura Lambert wrote:

Tuesday, February 16, 2016, 14:19 coated with TaC yesterday and let dry overnight. wrapped with one long Ta heat shield - wrapped around tube 3x, with Ta wire to offset Ta foil away from container loaded into evap2 and currently pumping down.  Wednesday, February 17, 2016, 10:51 HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min, vacuum stable. IGP1 = 5.9e-7 Torr. Initiating auto-ramp at 0.2A/min to a final setpoint of 400A. Final desired temperature = 1900C  Thursday, February 18, 2016, 09:16 IGP1 = 6.6e-7 Torr. TGHT = 303A, 4.3V OMEGA = 1311C Increasing ramping rate to 1.0A/min.

 Thursday, February 18, 2016, 13:10

TGHT reached to 450A, temp at 1800C.  Stepped up TGHT 490A, temp measured at ~1900C. 

John Wong wrote:

Laura Lambert wrote:  Tuesday, February 16, 2016, 14:19 coated with TaC yesterday and let dry overnight. wrapped with one long Ta heat shield - wrapped around tube 3x, with Ta wire to offset Ta foil away from container loaded into evap2 and currently pumping down.  Wednesday, February 17, 2016, 10:51 HS water valves opened, no leaks detected. Tapped up manually to 35A. Waited ~20min, vacuum stable. IGP1 = 5.9e-7 Torr. Initiating auto-ramp at 0.2A/min to a final setpoint of 400A. Final desired temperature = 1900C  Thursday, February 18, 2016, 09:16 IGP1 = 6.6e-7 Torr. TGHT = 303A, 4.3V OMEGA = 1311C Increasing ramping rate to 1.0A/min.    Thursday, February 18, 2016, 13:10 TGHT reached to 450A, temp at 1800C.  Stepped up TGHT 490A, temp measured at ~1900C.

Thursday, February 18, 2016, 17:21

TGHT remained at max setpoint for 4hrs.

IGP1 = 6.6e-7 Torr.

OMEGA = 1913C

Initiating auto-cool for TGHT at 2.0A/min.

 Friday, February 19, 2016, 14:17

evap2 vented and opened up this morning.

container looks good.

 2021-07-21 4:44pm Vacumm at 1e-5Torr. Water cooling leak check ok.

 2021-07-21 4:54pm ramping up TGHT to 200A 1A/10s.

2021-07-21 5:31pm 200A TGHT, TC 94degC pyro 1100degC. TC very low, ramping down and venting.

2021-07-22 5:00pm Parasitic prototype target installed, Vacuum 3e-5T, leak check ok. Power on HE of parasitic target.

2021-07-22 5:14pm vacuum 2e-5T. Ramping up container to 100A , 1A/10s.

2021-07-22 5:33pm vacuum 1e-5T. All good at 100A. Ramping up container to 200A , 1A/10s.

2021-07-22 5:54pm vacuum 8.2e-6T. All good at 200A pyro at 1100degC. Ramping up container to 300A , 1A/10s.

2021-07-22 6:15pm vacuum 7.6e-6T. All good at 300A pyro at 1420degC. Ramping up container to 400A , 1A/10s.

2021-07-22 6:36pm vacuum 8e-6T. All good at 400A pyro at 1700degC. Ramping up container to 500A , 1A/10s.

2021-07-22 6:57pm vacuum 1e-5T. All good at 500A pyro at 1960degC. Ramping up container to 553A , 1A/10s.

2021-07-22 7:13pm vacuum 1e-5T. All good at 553A pyro at 2100degC.

2021-07-22 7:36pm Ramping down 1A/10s.

2021-07-23 10:00am Venting.

 2020-10-27 10:24 setup introduced yesterday. Pumping over night IGP1: 5.7e-7T. Water leak check ok. Performing heating elements check.

 2020-10-27 10:43 Heating elements check show low cooling. Ramping up target 1A/15s to 200A.

 2020-10-27 11:54 all ok 200A, thermocouples show room temperature on cartridge and heat shield. Ramping up target 2A/10s to 300A.

 2020-10-27 11:54 all ok 300A, thermocouples show 28/25degC. Ramping up target 2A/10s to 400A.

 2020-10-27 11:54 all ok 400A, thermocouples show 36.5/29degC. Ramping up target 2A/10s to 500A.

 2020-10-27 11:54 all ok 500A, thermocouples show 48.9/33degC. Ramping up target 2A/15s to 550A.

 2020-10-27 12:43 all ok 550A, thermocouples show 55/34degC. Ramping up target 2A/15s to 600A.

 2020-10-27 12:43 all ok 600A, thermocouples show 61.5/35.2degC. Ramping up target 2A/15s to 625A.

 2020-10-27 13:14 all ok 625A, thermocouples show 64.6/34.2degC. Ramping up target 2A/15s to 650A.

 2021-04-04 16:07 New container is in with heatshields, vacuum 8.6E-6 torr. leak check done. ramping up current, checking both pyrometer and TC, 1A/10s.

 2021-04-04 16:49 200A TGHT 250degC on TC 1130degC on pyrometer. Too low on TC, ramping down and venting to reposition TC in the foil. 

 2021-04-04 18:00 TC was slightly broken, repaired now. Pumping chamber.

 2021-04-04 18:41 ramping up to 200A 1A/10s.

2021-04-04 18:41 200A TGHT, TC 389degC pyro 1130degC. ramping to 400A 1A/10s.

2021-04-04 18:41 300A TGHT, TC 554degC pyro 1440degC. 

2021-04-04 18:41 400A TGHT, TC 735degC pyro 1720degC. ramping to 600A 1A/10s. 

2021-04-04 20:15 500A TGHT, TC 891degC pyro 1990degC

2021-04-04 20:15 553A TGHT, TC 975degC pyro 2129degC, ramping down.

2021-04-06 13:44 Parasitic target plus thermocouples were introduced in evap2 the day before and put under vacuum. IG1 3E-7 torr, leak check done. Putting some power into HE while ramping up container to 100A 1a/10s.

2021-04-06 14:06 20W on HE 100A on target container. Everything stable. Ramping up to 200A 1A/10s 

2021-04-06 14:06 20W on HE 200A on target container. Everything stable. Ramping up to 300A 1A/10s 

2021-04-06 14:06 20W on HE 300A on target container. Everything stable 4.6E-7 torr. Ramping up HE to 40W.

2021-04-06 14:06 40W on HE 300A on target container. Everything stable 4.6E-7 torr. Ramping up container to 400A 1A/10s.

2021-04-06 14:06 40W on HE 400A on target container. Everything stable 1E-6 torr. Ramping up container to 500A 1A/10s.

2021-04-06 15:52 35W on HE 500A on target container. Everything stable 1.6E-6 torr. Ramping up He to 65W.

2021-04-06 18:40 at 50W on HE one of them broke, system ramped down, vented, HE replaced, pumping down system again.

2021-04-07 10:38 HE at 70W, ramping up container to 200A 1A/10s. Vacuum 3.3E-7 torr.

2021-04-07 10:59 HE at 70W, 200A on container, ramping up container to 300A 1A/10s. Vacuum 3.9E-7 torr.

2021-04-07 10:59 HE at 65W, 300A on container, ramping up container to 400A 1A/10s. Vacuum 4.5E-7 torr.

2021-04-07 11:50 HE at 70W, 400A on container, ramping up container to 500A 1A/10s. Vacuum 7.8E-7 torr.

2021-04-07 11:50 HE at 65W, 500A on container, ramping up container to 553A 1A/10s. Vacuum 1.4E-6 torr.

2021-04-07 11:50 HE at 65W, 553A on container. All good, ramping down. 1A,10s.

Monday, September 28, 2020, 11:49

6 discs of np-SiC were loaded to the target boat wrapped with 3 layers of heat shields.

Desired temperature at 1500 C, (As per e-log 414/416, TGHT = 450A/7.31V, 3.28kW) 

Omega slope set at 1.05 (for carbide)

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

Pumping down in progress

 Monday, September 28, 2020, 21:44

Pressure at 1e-6 Torr.  Initiated autoramping at 0.2A/min to reach 300 A.  Monitor temp.

 Wednesday, September 30, 2020, 11:39

TGHT reached to 300 A/ 4.5V, temp at 1130 C.  No coating on windows.

Continue to ramp up 330A.  Monitor temp.

 Wednesday, September 30, 2020, 16:38

TGHT reached 330 A / 5.04 V, temp at 1190 C. 

Ramp up to 400 A. Current pressure at 9.8 e-7 Torr.

Thursday, October 01, 2020, 10:28

TGHT reached 400 A/ 6.3V, temp at 1320 C.  Continue to ramp up to 450 A.

 Thursday, October 01, 2020, 16:44

TGHT reached to 450 A/ 7.4 V.  TEmp at 1500 C. 

Pressure at 1.35 e-6 Torr and coming down.   Continue to hold TGHT at 1500 C for at least 24 hr.

 Sunday, October 04, 2020, 16:49

TGHT has been holding at 450 A/ 7.3 V for nearly 3 days; temp has gone up and stabilized at 1554 C; pressure at 2.13 e -7 Torr.

Initiated cooling down at -2A/min.

 Monday, October 05, 2020, 10:02

Chamber vented.

Monday, August 20, 2018, 17:58

14.9 g of np-SiC fibrous target discs are loaded into the container (previously coated with TaC and sintered, see elog ID 414).

Total loaded length 9.5 cm. 

A 1.5" width graphite sheet is used as under layer to prevent TaC diffused to the discs; this was observed during the heat treatment, (see dropbox SEM images).

Both end caps are in.  With ionizer pointing out, right cap is expended BUT NOT left cap - will need to expend this after the conditioning.

No Ta heat-shield is used.

Final conditioning temperature:  1500 C (As per e-log 414, TGHT = 450A/7.31V, 3.28kW) 

Keeping TBHT at 0A for now - will ramp up after TGHT reach to the desired temperature. 

OMEGA slope set at 0.99

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

 Tuesday, August 21, 2018, 10:24

Pressure at 1.2e-6 Torr. 

Initiated autoramping at 2A/min for TGHT to reach 400A - monitoring temp and vacuum.

TBHT set at 10A. 

 Tuesday, August 21, 2018, 15:13

Temp reached to 1350C. TGHT at 400A/6.7V. Pressure at 1.9e-6 Torr after holding at the temp for 100 min.

 Tuesday, August 21, 2018, 15:28

Tapped up TGHT to 450A/7.8V (3.5kW).  Temp measured at 1465 +/- 5 C.  Pressure coming down from 3.5 e-6 Torr.

 Tuesday, August 21, 2018, 15:32

Tapping up TBHT to 230A

 Tuesday, August 21, 2018, 16:25

TBHT at 230A/4.33V.  Pressure started to increase from 150A, and reached to 3.3e-6 Torr after TGHT reached to the setting.

Temperature measured at 1475 C +/- 5C.  Holding at this temperature until vacuum comes to stabilization (est.2-3 hours)

 Tuesday, August 21, 2018, 16:45

Checked with Mikron (slope set at 0.99); temp on left end-cap measured at 1490 +/- 20C (that's close enough).  Temp on ionizer tube about 1900C

 Tuesday, August 21, 2018, 22:12

Pressure at 1.7e-6 Torr.  Temp holding at 1480C, TGHT at 450/7.7V, TBHT 230A/4.27V.

Cooling down at 2A/min for TGHT and 1A/min for TBHT

 2020-10-15 18:51 : Setup installed during the day. Pumped down to IGP1:1.5e-5T , water leak check ok. Ramping up to 100A. 

 2020-10-15 19:30 : A heating element was showing bad signs and failed very early. ramping down and venting. 

 2020-10-13 11:13 Target was left under vacuum over the weekend. IGP1: 1.6e-7T water on- leak check ok. Ramping up 2A/30s to 100A.

 2020-10-13 11:47 All ok at 100A. Ramping up, 1A/10s to 200A.

 2020-10-13 12:08 All ok at 200A. Temp tc on foil 200degC. Ramping up, 1A/10s to 300A.

 2020-10-13 12:08 All ok at 300A. Temp tc on foil 340degC. Ramping up, 1A/10s to 400A.

 2020-10-13 12:48 All ok at 400A. Temp tc on foil 474degC. pyro shows 1050degC Ramping up, 1A/10s to 500A.

 2020-10-13 13:06 All ok at 500A. Temp tc on foil 615degC. pyro shows 1238degC Ramping down, 1A/10s to 0A.

 2020-10-13 17:04 The foil has been replaced due to suspected radiation transparency being the cause of low measured temperatures. A graphite and tantalum pack is now attached. Vacuum is back to IGP1: 9.5e-6T. Ramping up to 100A, 1A/10s.

 2020-10-13 17:31 All ok at 100A. Temp tc on foil 80degC. Ramping up, 1A/10s to 200A.

 2020-10-13 17:31 All ok at 200A. Temp tc on foil 310degC. Ramping up, 1A/10s to 300A.

 2020-10-13 17:31 All ok at 300A. Temp tc on foil 468degC. Ramping up, 1A/10s to 400A.

2020-10-13 17:31 All ok at 400A. Temp tc on foil 598degC. Ramping up, 1A/10s to 500A.

2020-10-13 17:31 All ok at 500A. Temp tc on foil 700degC. Ramping up, 1A/10s to 600A.

2020-10-13 17:31 All ok at 600A. Temp tc on foil 760degC. Ramping down, 1A/20s to 0A.

2020-10-14 17:09 foils for radiation focusing have been replaced and doubled to reduce transmission. IGP1:1.5e-5T , water leak check ok. Ramping up to 100A 1A/10s.

2020-10-14 17:30 All ok at 100A. Temp tc on foil 60degC. Ramping up, 1A/10s to 500A. 

2020-10-14 17:50 All ok at 200A. Temp tc on foil 378degC. 

2020-10-14 18:10 All ok at 300A. Temp tc on foil 550degC. 

2020-10-14 18:10 All ok at 400A. Temp tc on foil 705degC. 

2020-10-14 18:10 All ok at 500A. Temp tc on foil 816degC.Ramping up, 1A/10s to 600A.

2020-10-14 18:10 All ok at 600A. Temp tc on foil 906degC.Ramping up, 1A/10s to 625A.

2020-10-14 18:10 All ok at 625A, IGP1: 1.3e-5T. Temp tc on foil 924degC.Ramping up, 1A/10s to 650A.

2020-10-14 19:21 All ok at 650A. Temp tc on foil 940degC.Ramping down, 1A/10s to 0A. Pyrometer on foil 1200degC

 Monday, December 07, 2015, 09:04

No heat shields.

Container empty.

IGP1 = 1.1e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Will tap up with the same parameters as last round to confirm results.

 Friday, December 11, 2015, 11:44

Took out of evap2 yesterday.

Aurelia took many emissivity measurements to compare with previous data - which matched up.

The dip in emissivity before going up again around ~560A could be due to oxidation of the materials.

 Monday, November 30, 2015, 15:37

No heat shields.

Container empty.

Loaded into evap2 and currently pumping down.

Tuesday, December 01, 2015, 10:07 

HS water valves opened this morning, no leaks detected.

IGP1 = 4.3e-7 Torr.

Slope of OMEGA = 0.98

Tapped up manually to 35A.

Vacuum stable, initiating auto-ramp at 2.0A/min and 1.0A/min for the TGHT and TBHT respectively.

Final setpoints: TBHT = 90A, TGHT = 360A

Once final setpoints reached, will tap up manually to max 1800C [legs = 2000C]

 Monday, December 07, 2015, 09:06

Container was tapped up manually with emissivity measurements taken every 50A starting at 360A.

The final measurement was taken at 640A.

Container was ramped down for the weekend.

See attachment for raw data.

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

 2020-11-05 15:44 empty and naked boat in for heating up system and clean up. Turbo on.

 2020-11-06 16:58 IGP1:4e-7T leak check ok. Ramping up target to 500A. 1A/10s.

 2020-11-09 12:43 The target was left at 1500degC during the weekend. 

 2020-11-17 14:11 turbo pump off. Slow venting.

 2020-11-18 09:18 Evap2 vented. Target removed.

Thursday, June 09, 2022, 11:25

Total number of foils: 14 electrospun fiber pellets 

Total weight = 208.3 g

container has 3 Ta heat shields.

Desired temperature at 1800 C

Omega slope set at 0.990 

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

Pumping down in progress

 Thursday, June 09, 2022, 11:25

chamber pumped down below 5e-5

initiate auto ramping, 1A/min ----> 100 A

 (see eLog 581)

Flora Wu wrote:

Thursday, June 09, 2022, 11:25 Total number of foils: 14 electrospun fiber pellets  Total weight = 208.3 g container has 3 Ta heat shields. Desired temperature at 1800 C Omega slope set at 0.990  Good vac = 3.0e-5 Torr, Bad vac = 5.0e-5 Torr. Pumping down in progress  Thursday, June 09, 2022, 11:25 chamber pumped down below 5e-5 initiate auto ramping, 1A/min ----> 100 A

 Thursday, June 09, 2022, 19:16

Pressure came down below 10e-5 Torr as TGHT ramped up to 100A.

Continue auto ramping to reach 250A at 1A/min.

 Thursday, June 09, 2022, 22:52

TGHT is hovering around 127A/1.68 V due to erractic pressure, see attachment #1..  Notice the backing line is at atm pressure - I don't recall this happened in the past. 

Temp is still low to be detected on Omega.  Will leave this overnight.

 Friday, June 10, 2022, 09:07

TGHT has been holding at 250A/3.76V since 2:45am.  Pressure comes down as THGT above 200 A.  Backing line is back down normal.

Temp reading at 1040 C. 

see attachment #2.

Continue to ramp up to 300A, monitoring temp/pressure.

 Friday, June 10, 2022, 10:31

TGHT reached to 300A/4.63V, temp at 1145C.  Pressure at 1.8e-6 and coming down. 

Continue to ramp up to 350A.

 Friday, June 10, 2022, 11:59

TGHT at 350A/5.66V, temp at 1300 C, Pressure at 8.1e-7 Torr, and coming down.

Continue to ramp up to 400A.

Friday, June 10, 2022, 13:19

TGHT reached to 400A/6.73V.  Pressure coming down from 1.04e-6 Torr. 

Temp at 1690.  Will set up manually to reach 1800 C. 

 Friday, June 10, 2022, 13:50

TGHT stepped up to 432A/7.42V.  Pressure coming down from 1.3 e-6 Torr. 

Temp at 1800 C.  See attachment#3 and #4 for the screenshot and temp-current plot.

Dumped striptool data to /usr1/evpr/carbonize_pan10_elog581_a and b.

Will keep at this setting over the weekend, and cooling down will take place on Sunday evening. 

 Sunday, June 12, 2022, 22:30

TGHT has been holding at 432A/7.40V since Friday.  Temperature has gone up slightly to 1825. 

See attachment#5 for the overall process. 

Initiated cooling down at -2A/min.

Chamber will be vented on Monday morning.

Friday, July 24, 2020, 15:00

Ta tube cotaining 497 ZrC discs wrapped with Ta heat-shields (3 layers)

Desired temperature= 1800C (expected TGHT 410 A), TBHT will be set fixed at 230A (max).

good vacuum = 3.00 e-05 Torr

bad vacuum = 5.00 e-05 Torr

Evap 2 was left to pump down over night.

Saturday, July 25, 2020, 08:57

IGP1= 8.7 e-07 Torr

Start ramp at 0.25 A/min to 20 A on TGHT 

Saturday, July 25, 2020, 10:07

IGP1= 2.7e -06 Torr

Set ramp target to 30 A 

Wednesday, July 29, 2020, 13:11 

OMEGA reading 1700 C at 430 A during the night.  It was kept at this temperature for 3.5 hours.  The OMEGA slope was not changed from 0.990

when IGP1 = 1.2 e-06 Torr and stable, cooling was started at -3A/min at 9 am on this day.

IGP1= 2.2 e-07 Torr now at time of dismounting