Thursday, August 05, 2021, 11:10

Total number of foils: 380

Total length packed 13.5 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two Ta discs at either end and three graphite discs as separators 

[Left end [ blade--no blade--blade---no blade]  Right end ]

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

Then heat manually to OMEGA ~1400 C , ramping TGHT manually and automatically  to reach 430A A (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 -5 Torr

Bad vac at 5.00 e-5 Torr

Total weight into Evap2 =503.8 g

Friday, August 06, 2021, 11:33

IGP1= 8.3e-07 Torr

Start heating at 0.5 A/min on both TGHT and TBHT up to 50A

Friday, August 06, 2021, 22:34

 IGP1= 7.0e-06 Torr

TGHT= 50.1 A, 0.6 V    TBHT = 50.0A, 0.6V

Continue heating at 0.5A/min to 400A on TGHT and 230A on TBHT

Saturday, August 07, 2021, 10:11

Stopped autoramping.  Will allow some time at 63 A on both TGHT and TBHT

Saturday, August 07, 2021, 12:19

IGP1= 1.9e-05 Torr

Manually increase TGHT and TBHT to 65 A 

Saturday, August 07, 2021, 23:01

IGP1= 5.8e-06 Torr

TGHT= 64.5 A, 08V  TBHT=64.6A, 0.8V

Ramp up manually while monitoring pressure 

Sunday, August 08, 2021, 08:46

IGP1= 6.0e-06 Torr

TGHT = 69A, 0.85V  TBHT = 69A, 0.90V

ramp up manually  

Monday, August 09, 2021, 08:54 

IGP1= 1.38e-05 Torr

TGHT= 90.0 A, 1.1V, TBHT= 90.0A 1.3V

Start autoramp at 0.5 A/min on both TGHT and TBHT to 400A and 230A respectively.

Changed bad vacuum to 5e-04 Torr

Monday, August 09, 2021, 21:37

IGP1= 6.6e-06 Torr

TGHT= 300.3 A, 5.0 V, TBHT = 233.0 A, 4.1V

 Increase ramp rate to 2A/min for TGHT to 400 A,

OMEGA = 1430 C

Monday, August 09, 2021, 22:09

Will autoramp at 2A/min up to 424A as per regression line on attached file 

Monday, August 09, 2021, 22:58

Temperature drop on OMEGA.  Unexpected.  Will lower current on TGHT to 418A and keep there for 4 hours.  OMEGA may not be reliable 

Tuesday, August 10, 2021, 3:16

IGP1=8.8e-07 Torr

TGHT = 414A, 7.5V TBHT = 233A, 4.1V

ramp down at -2A/min for TGHT and -1A/min for TBHT

Tuesday, August 10, 2021, 10:35

IGP1= 3.6e-07 Torr

Dismount

Some discs, especially end sections were coated with a golden layer.  

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, May 18, 2022, 09:46

Total number of foils: 415 ( including 10 analysis discs on the right side of the container)

Total weight = 1580 g (includes heatshields and T bar)

Total length packed 17 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  front (right) side

Initially to ramp TGHT and TBHT to 30A at 3 A/min

then continue to and slow down ramp when pressure begins to increase

max approx 700A 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= 7.1 e-07 Torr at start of initial ramp.  Note, first real operation with new noisy Turbo Pump.

Wednesday, May 18, 2022, 10:18

Pressure increase observed starting around 60A.  Ramped to 70 A and will leave until pressure stabilizes

After about 30 minutes pressure dropped so ramped up to 90 A @1A/min on both TGHT and TBHT

Wednesday, May 18, 2022, 11:37

pressure spike around 90A.  will leave until pressure stabilizes 

Wednesday, May 18, 2022, 12:54  

start autoramp to 100A at 1A/min.  IGP1= 1.4e-4 Torr

Wednesday, May 18, 2022, 13:15

autoramp to 150A @1A/min 

Wednesday, May 18, 2022, 13:41

 At 110A another spike in pressure.  System waiting for good vacuum

Wednesday, May 18, 2022, 15:24

ramped to 150A on both TGHT and TBHT.  Ramping to 200 A at @A/min for both TGHT and TBHT

currently IGP1=  2.0e-4 Torr

Wednesday, May 18, 2022, 15:33  

Pressure still trending down; therefore will start ramp at 4A/min to 400 amp on TGHT and 230A to TBHT

Wednesday, May 18, 2022, 16:22 

Increasing ramp to 4A/min on TGHT

Wednesday, May 18, 2022, 17:26 

switched to 6A/min in 1A/10s increments on TGHT

Wednesday, May 18, 2022, 17:43 

Set final current to 730 A as per regression attached.

Wednesday, May 18, 2022, 17:54

Final current on TGHT = 740A, 11.9 V

OMEGA = 1775 C

TBHT = 230A, 

Will leave for 4 hours

Wednesday, May 18, 2022, 19:56

Temperature dropped so increased current to 755A for the remaining of the time.

Friday, May 20, 2022, 08:58

Final notes:  The difference between initial and final mass was 6 g as expected.  Slight coating on window of evaporator may explain apparent temperature drop.  Next time will keep current at projected setting.  The material looks good with slight overheating on the outer discs of left side.

Tuesday, June 07, 2022, 07:19

Total number of foils: 403 ( including 5 analysis discs on the right side of the container)

Total weight = 1535.3 g (includes heatshields, spring and T bar)

Total length packed 16.4 cm (excluding 5 analysis discs that will be removed)

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  front (right) side

Initially to ramp TGHT and TBHT to 50A at 3 A/min

then continue to 80A and slow down ramp when pressure begins to increase

max approx 700A 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= 7.6 e-07 Torr at start of initial ramp.

 Tuesday, June 07, 2022, 11:14

Ramping to 150A on TGHT and TBHT at 1A/min

Ramped TGHT and TBHT to 230A at 2A/min

Tuesday, June 07, 2022, 13:12

Ramping TGHT to 600A at 4A/min

TBHT at 230A, 3.0V

Tuesday, June 07, 2022, 16:41

TGHT= 740 A, 12.1V

TBHT= 232A, 3.0 V

OMEGA reading 1616C but questionable.  Will leave for 4 hours at 740A top TGHT.

Wednesday, June 08, 2022, 22:15

Early Wednesday morning the left TGHT bolt was found damaged.  The target leg was coated with bolt material rendering the Target inoperable.   

The Heatshield assembly was swapped and surfaces cleaned.  A "dummy" FEBIAD was installed to test if the system can withstand high current. 

The system was pumped down and ramped to 740A on TGHT at 4A/min.  It was then left at that current for 4 to 5 hours.

Currently starting rampdown at -2A/min to 0A. 

Photos of the incident attached in *eLog 580*.  IGP1= 5.7e-06 Torr

TGHT= 742A, 11.4V

Tuesday, June 21, 2022, 09:43

Total number of foils: 377 ( including 6 analysis discs on the right side of the container)

Total weight = 1454 g (includes heatshields, spring and T bar)

Total length packed 15.5 cm (excluding 6 analysis discs that will be removed)

container has 3 Ta heat shields and is coated

No endcaps inserted to facilitate out-gassing

Ta coated spring at  front (right) side

Initially to ramp TGHT and TBHT to 80A at 2 A/min

then to 120A and slow down ramp when pressure begins to increase

max approx 675A 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=3.6 e-07 Torr at start of initial ramp.

Tuesday, June 21, 2022, 13:54

IGP1= 7.1 e-05 and dropping.  Start ramp to 150A for both TGHT and TBHT @1A/min

Tuesday, June 21, 2022, 21:27

Increased ramp rate to 3A/min for TGHT to 675A

Tuesday, June 21, 2022, 22:38

Ramp up to 685 A on TGHT and leave for 4 hours. 

OMEGA = 1645 C but suspect reading not on Ta surface.

Wednesday, June 22, 2022, 02:28

IGP1=7.7e-6 Torr

OMEGA =1610C

TGHT = 685A, 10.5V

TBHT = 230A, 3V

initiate rampdown at -2A/min and -1Amin TGHT and TBHT

Monday, March 06, 2023, 21:29

Total number of foils:382 ( including 5 analysis discs on the right side of the container)

Total length packed 17 cm (excluding 5 analysis discs that will be removed)

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A 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 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 3e-06 Torr at start of initial ramp.

Tuesday, March 07, 2023, 07:23

IGP1= 1.2e-05 Torr

OMEGA = 1288 C

Tuesday, March 07, 2023, 10:01

Will ramp to 715 A and keep there for 4 hours.  OMEGA readings not reliable beyond this point due to coating on EVAP2 window.

Tuesday, March 07, 2023, 11:10

TGHT = 715A, 11.0V

TBHT = 230A, 3.2V

OMEGA = 1750 C (but not reliable)

Maintaining for 4 hours then will ramp down @ -2A/min TGHT and -1A/min TBHT

Wednesday, March 08, 2023, 07:27

Final IGP1= 1.3e-07 Torr (before shutting down pumps)

Monday, March 13, 2023, 22:28

Total number of foils:380 ( including 5 analysis discs on the front side of the container)

Total length packed 17 cm (excluding 5 analysis discs that will be removed)

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A on TGHT and 230A on TBHT (Omega slope set = 0.990)

Then temperature = 1800 C.  Will ramp to 1820 C

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

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 2.8e-06 Torr at start of initial ramp.

Tuesday, March 14, 2023, 07:26  

Increased autoramp to 2A/min to 700 A on TGHT while keeping TBHT to 230A, 3.3V

Tuesday, March 14, 2023, 09:53

At 743A, 11.8V TGHT

OMEGA = 1780 C.  (not entirely reliable, will leave at this current for 4 hours)

Tuesday, March 14, 2023, 14:00

Starting rampdown at -2A/min on TGHT and -1A/min TBHT

Final IGP1= 5.5e-06 Torr

OMEGA= 1750C

TBHT= 230A, 3.3V

Wednesday, December 06, 2023, 09:47

Target number of foils:370

Analysis discs 16 A and 16B interspersed on the end further from the laser

A are discs produced using new method and B are discs produced using milling.

Total length packed 16 cm (excluding the analysis discs)

container has 3 Ta heat shields (one inner around fins and center block, new type of 1st shield made up of three pieces)

No endcaps inserted to facilitate out-gassing

Ta coated spring at  front end

ramp to 120A @ 1A/min TGHT and to 120A on TBHT hold there until pressure drop, then ramp to 500A on TGHT and 230A TBHT.

max approx 700A 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 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 1e-06 Torr at start of initial ramp.

Wednesday, December 06, 2023, 09:56

System left to drop pressure over previous night and now at 120A.  waiting for pressure drop.

Wednesday, December 06, 2023, 11:18

increased ramp rate to 2A/min

Wednesday, December 06, 2023, 14:41

increased ramp to 3A/min on TGHT and stopping to allow pressure to stabilize before taking temperature readings

Top temperature 1800C at 710 A but started dropping.  Increased current to 750A and left there for 4 hours.

Cool down at -2A/min TGHT and -1A/min TBHT

Thursday, December 14, 2023, 09:53

Target left pumping down in Evap2 overnight. 

Initial weight including protective jig = 1474.3 g

Total number of target foils:388 

 10 analysis discs: 5x 220727-2 labelled as A and 5x 231123-2 labelled as B on the right side (front) of container.  Order of discs ABABABABAB.

Total length packed 15.5 cm

container has 3 Ta heat shields including the inner made of three pieces as to cover the center block.

No endcaps inserted to facilitate out-gassing

Ta coated spring at  both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A 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 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 9.3e-07 Torr at start of initial ramp.

Thursday, December 14, 2023, 09:56

Started initial ramp up 1A/min on both heaters

Thursday, December 14, 2023, 11:03

Pressure dropping.  Will increase ramp speed to 2A/min on both heaters (1A/30s)

Thursday, December 14, 2023, 11:17

pressure dropping.  Increase ramp to 4A/min (2A/30s)

Will stop and ramping for temperature measurements

Thursday, December 14, 2023, 13:28

Increased ramp to 5A/min (2.5A/30s)

 Will heat to 703A on TGHT and leave for 4 hours

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.

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

Friday, April 04, 2025, 06:41

Total number of foils:328

Total length packed 15.2 cm

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at back, coated cap at front with perforations

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A 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 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 1e-06 Torr at start of initial ramp.

initiating ramp up

 Friday, April 04, 2025, 10:54

Paused ramp at 128.5A TGHT and 130.2 A TBHT.  Will hold and let pressure drop.

IGP1 = 5.43e-04 Torr currently

Friday, April 04, 2025, 14:04

restarting ramp

IGP1=2.6e-05 Torr

Friday, April 04, 2025, 16:35

increasing ramp to 3A/min

@18:15 ramp was slowed down to 2A/min and left to reach 730~A

Friday, April 04, 2025, 22:54

Current was stopped at 733A on readback and left for 3.5 hours, then manually ramped to 738A for 0.5 hours. 

This is in accordance with the initial oven (Elog 619)

Friday, April 04, 2025, 23:45

starting ramp down at -1A/min TBHT and -2A/min TGHT

Thursday, May 29, 2025, 06:55

Total number of foils:

Total length packed

container has 4 Ta heat shields (one inner only around fins)

No endcaps inserted to facilitate out-gassing

Ta coated spring at both ends

ramp to 500A @ 1A/min TGHT and to 230A on TBHT

max approx 700A 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 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1= 1.3e-06 Torr at start of initial ramp.

initiating ramp up

Thursday, May 29, 2025, 20:12

Final current 738 on readback.  Will leave for 4 hours.  OMEGA reads 1750 but staying near sintering current.

Thursday, May 29, 2025, 23:55

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

Tuesday, June 10, 2025, 13:16

reached 1800 C at 420 A on RD and 428 on TGHT setting.  Will leave until 5 pm. 

Tuesday, June 10, 2025, 16:07

OMEGA reading 1900 C without further increase in current.

Will start rampdown early to prevent overheating

 Monday, June 09, 2025, 13:48

container has 4 Ta heat shields

one endcap at front

max approx 400A on TGHT

Then temperature = 1850C with OMEGA slope = 0.990

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

 IGP1=  Torr at start of initial ramp.

Tuesday, June 10, 2025, 06:57

starting ramp to 90A at 1A/min

initial IGP1= 1.7e-06 Torr

Tuesday, June 10, 2025, 09:31

Continuing to ramp at 1A/min towards 400A 

May increase the rate after primary outgassing is finished

Tuesday, June 10, 2025, 10:50

increased ramp to 2A/min

 Monday, June 23, 2025, 12:57

container has 4 Ta heat shields

one endcap at front

max approx 380A on TGHT

Then temperature = 1850C

Slope will use is 0.980 

Good vac at 5.00 e -4 Torr

Bad vac at 5.00 e-2 Torr

Monday, June 23, 2025, 12:59

Start ramping at 2A/min 

IGP1 initial = 8e-06 Torr (small amount of discs so can ramp up fast) 

Monday, June 23, 2025, 21:34

OMEGA read 1600 C.  Left for 4.5 hours.

final TGHT current = 382.5 A on readback and 390 A on setpoint

final TGHT voltage = 6.9 V

Adjusted temperature so as to not overheat small amount of discs in cartridge.

Ramping down at -2A/min 

Wednesday, June 20, 2012, 17:23

New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains 3 NiO pellets :

Sample,   # Disks,    Mass (g),    Thickness (mm)

1    12,  1.9396,  1.938

2    13,  0.9592,  0.847

3    25,  2.6675,  3.06

See John's Ipad for their recipes.

Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).

Thursday, June 21, 2012, 18:14  

See attachment #1, 2 for the density measurements and the graph for the disc thickness  -JW 

Nikita Bernier wrote:

Wednesday, June 20, 2012, 17:23 New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains NiO D-shape discs : Sample,   # Disks,    Mass (g),    Thickness (mm) 1    12,  1.9396,  1.938 2    13,  0.9592,  0.847 3    25,  2.6675,  3.06 See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).

Wednesday, June 20, 2012, 22:28

TGHT tripped off at 78A due to high out-gassing pressure.  The current was tapped down to 75A before it was turned back on. 

Changed ramping rate from 0.5A/min to 0.2A/min.  

Initiate auto-ramping... 

 Thursday, June 21, 2012, 08:35

Vacuum has come down to 7e-7 as TGHT is being ramped up at 0.2A/min. (see attachment#1).

Increase TGHT rate to 2A/min.

The temperature should be measured when the heater gets up to around 500A.

John Wong wrote:

Nikita Bernier wrote: Wednesday, June 20, 2012, 17:23 New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains NiO D-shape discs : Sample,   # Disks,    Mass (g),    Thickness (mm) 1    12,  1.9396,  1.938 2    13,  0.9592,  0.847 3    25,  2.6675,  3.06 See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).   Wednesday, June 20, 2012, 22:28 TGHT tripped off at 78A due to high out-gassing pressure.  The current was tapped down to 75A before it was turned back on.  Changed ramping rate from 0.5A/min to 0.2A/min.   Initiate auto-ramping...   Thursday, June 21, 2012, 08:35 Vacuum has come down to 7e-7 as TGHT is being ramped up at 0.2A/min. (see attachment#1). Increase TGHT rate to 2A/min. The temperature should be measured when the heater gets up to around 500A.

 Thursday, June 21, 2012, 17:37

The NiO discs were heated up to 1500C at 560A.  The target heater was lowered in steps and the temperature was measured.  At 320A, the target container was ~1110C.  (see attachment #1) 

There was a sign of resistant on the target container as the p/s voltage started to go up at a higher rate.  (see attachment#2, 3, 4 for the archived striptool).

Unfortunately, the target container was broken; it was most likely reacted with the Ni.  (see attachment#5)

So.... the possible solution?!  TRY coating the container with Ta2O5.  Will discuss more in the Friday Jun 22 meeting. 

Thursday, July 12, 2012, 17:29

NiO was sprayed on Ni foil.

Average/discs: mass= 0.075g, thickness=0.076mm, density = 7.023g/cm3.

4 set of samples were loaded onto the targetboat (coated/sintered with TaC).  A piece of Ta foil was used as the under layer (see attachment #1).

A 0.002" thick Ta foil was wrapped around the container as the heat-shield.

The chamber was pumped down to 5.0e-6 Torr before the cooling water valve was opened; no leaks was detected.

For this process, the target heater will only go up to 250A (~1100C), with auto-ramping rate at 0.5A/min.

The heater has been stepped up to 50A, local 32A/ 0.23V.  The vacuum reached to max 1.6e-5 Torr, and it's coming down.

Thursday, July 12, 2012, 17:51

Auto-ramping initiated...

 Friday, July 13, 2012, 09:42

TGHT reached to 250A and stayed for 6 hrs (see attachment #2).  At that current, the target wasn't glowing so the temperature could not be measured. 

Initiated auto-cooling at 2A/min. 

Friday, July 13, 2012, 11:00  

TGHT reached to 65A.  Stopped the auto-cooling process and manually tapped down the p/s to 0A.  

Vacuum is stable at 5.7e-7 Torr.  

In the next 30 min or so, the chamber will be vented and the NiO target material will be taken out for inspection.