Thursday, February 21, 2019, 09:01

Container coated with TaC and wrapped with 2 Ta heat shields.

Desired temperature= 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max). 

Good vac at 3.00e -5 Torr

Bad vac at 5.00e-5 Torr

Chamber pump down was started on Wednesday February 20th; however, this morning IEVAP2:TP1 and IEVAP2:BV1 were found in the OFF position.

There are no abnormal sounds from the roughing pump.

IGP1= 5.6e-2 Torr

Will turn on IEVAP2:BV1 and IEVAP:TP1 from the hot lab and listen for anything out of the ordinary.

 Friday, February 22, 2019, 09:56

Pumped down to IGP1=2.1 e-07

Will tap up TGHT and TBHTmanually and monitor the pressure.

Friday, February 22, 2019, 11:20

Manually tapped up TGHT (V~ 0.90) and TBHT(V ~0.99) to 90A

maximum pressure reached ~7.4e-06 Torr and trended down

Friday, February 22, 2019, 11:25

Initiating Autoramp @ 0.2 A/min for TGHT to reach 450A and TBHT to reach 230A

Estimated temperature for TGHT ~1200 C
 

 Friday, February 22, 2019, 15:42

TGHT @ 145 A and TBHT @ 138A

Changed Autoramp to 0.1 A/min  so that it will take over the weekend to reach 450A and 230A for TGHT and TBHT respectively.

Monday, February 25, 2019, 08:29

IGP1=1.1e-07 Torr, TGHT= 451.4 A, 6.7 V, TBHT = 233.1 A, 3.1 V

Omega T = 1197 C

Will manually tap up by increasing TGHT current by ~1A/min monitoring pressure.   Will allow system to stabilize ~1400 C.

 Monday, February 25, 2019, 11:14

 Trend forcast 1400 C at TGHT= 566.75 A (Line plot attached)

Actual but not stable ~1445-1452 C at 566 A

Will continue to manually increase current monitoring pressure

 Monday, February 25, 2019, 12:33

Omega T= 1679 C , TGHT = 657.7A, 10.52 V, TBHT = 233.2 A, 3.2 V

IGP1 = 1.4e-05 Torr slightly trending up.

Autoramp @ 1 A/min to a maximum of TGHT 780 A. 

Monday, February 25, 2019, 14:43

IGP1= 3.7e-06 Torr trending down slightly, TGHT = 780.3 A, 12.9 V

Omega T = 1931 C

Monday, February 25, 2019, 15:14

manually tap up to TGHT to 790 A

Monday, February 25, 2019, 15:36

IGP1= 2.9e-6 Torr trending down

TGHT = 784.3 A, 13.01 V

TGHT current set to 790 A

Omega T = 1940 C

Will leave over-night

 Tuesday, February 26, 2019, 08:23

IGP1= 7.85e-07 Torr Stable

TGHT = 784.32 A, 12.54 V

TBHT = 233.3 A, 3.2 V

OMEGA T = 1948 C

Initiating Auto-cool ramp at 2.0A/min and 1.0A/min for TGHT and TBHT respectively.

Wednesday, February 27, 2019, 08:10

IGP1 = 3.3 e-08 Torr Stable

TGHT = 0A, 0.05V

TBHT = 0.02A, 0. V

Will begin vacuum release

Thursday, March 07, 2019, 09:09

Transfer tube from Legnaro was coated with TaC.

The transfer tube was set in a tantalum boat and wrapped with 3 heat shields,

the legs of the transfer tube were let out of the shielding sheets.

Chamber pump down was started on Wednesday March 06, 2019.

Desired temperature TGHT = 1800 C, Omega slope set = 0.990.

IGP1= 4.48e-07 Torr

Will tap up TGHT manually to 40-50 A and monitor pressure.

 Thursday, March 07, 2019, 10:57

The TGHT current was left at 40 A for 50 min, the pressure achieved was 6.15e-7 Torr

The TGHT was rised to 45 A 11:00 am the pressure rised to 6.18e-7 Torr (11:10am)

The TGHT was rised to 50 A 11:10 am the pressure rised to 6.81e-7 Torr (11:32am)

auto ramp was set to 1 A/min to 300 A

Good vacuum 3e-5 Torr

Bad vaccum 5e-5 Torr

auto ramp was set to 1 A/min to 400 A

auto ramp was set to 1 A/min to 470 A

Final conditions TGHT = 485 A, 8.25V Temperature = 1800 C

The transfer tube stayed at 1800 C for 4 hours

auto ramp was set to -1 A/min to 0 A. 

Friday, March 08, 2019, 16:53 

EVAP2 was vented with air and the transfer tube was unloaded

 Wednesday, March 13, 2019, 15:41

An uncoated tantalum tube was loaded with a graphite insert (with conical caps).

3 tantalum foils were wrapped around the tantalum tube and a Ta cap was added.

EVAP2 is currently pumping down

The tube will be hated for 5 days at 2000 C

Thursday, March 14, 2019, 10:07

IGP1 = 5.37e-7 Torr

The TGHT will be tapped manually to 50 A  

After aprox 1 hour IGP1 = 5.08e-7 Torr, TGHT=46.5 A, 0.224 V

Autoramp is set to 1A/min to 300 A

 Autoramp is set to 1A/min to 450 A

Autoramp was stopped at 425 A when 2000 C were achieved

 Sunday, March 17, 2019, 00:25

IGP1 = 2.03e-7 Torr

TGHT=424.2 A, 7.117 V, temp 1976 C

Sunday, March 17, 2019, 15:04 

IGP1 = 21.6e-7 Torr

TGHT=424.1 A, 7.085 V, temp 1967 C

cooling down -1 A/min

Monday, March 18, 2019, 15:51

Total number of foils: 555

Total mass of material including graphite foils: 478 grams

Total length packed 14.2 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end to allow for ZrC expansion.

5 extra foils tucked beneath each spring for QC; total mass (10 discs) =1.0160 g

Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 280A A (Omega slope set = 0.990, approx 1400 C, Elog#427),  TGHT will be tapped up accordingly to reach desired temperature. 

TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Currently being pumped down.

 Tuesday, March 19, 2019, 08:57

Current pressure IGP1 = 5.24e-07 Torr

Manually tapping to 40A on TBHT and TGHT

At 20 A IGP1 pressure trending up.  Will leave at 20A until trending down.

Pressure @ 20 A set, peaked ~1.8e-06 Torr after 1 hour

Tuesday, March 19, 2019, 10:32

Tapping manually to 50 A on TBHT and TGHT while monitoring IGP1 pressure

Tapped to 25 A and IGP1 pressure trending up.  Will allow to stabilize.

Tuesday, March 19, 2019, 11:34

Pressure stabilized at ~3.25e-06 Torr

Tapped up to 30 A on both TGHT and TBHT

Pressure stabilized at ~6.6e-06

Tapped up to 34A on both TGHT and TBHT

Pressure stabilized at ~1.2e-05 Will allow to drop before proceeding

 Tuesday, March 19, 2019, 13:43

Tapped up to 40A waiting for pressure to stabilize

Pressure shot up ~8.5e-05, therefore tapped down TGHT to 35A (At 35A TGHT current value fluctuates, probably better to ramp up to 36A)

Will let pressure drop before proceeding with TGHT heating

Ramped TGHT to 36A, IGP1 pressure still trending down and current measurements stable.

 Starting autoramp at 0.3A/min for both TGHT and TBHT until 280A and 230A respectively

Initial TGHT Current: 33.6A, 0.05V

Initial TBHT Current: 38.6A, 0.48V

IGP1 = 4.9e-05 Torr

Wednesday, March 20, 2019, 09:41

 TGHT has only ramped to 45.7 A, 0.085V

TBHT has only ramped to 50.2A, 0.62V

IGPI pressure ~4.0 e-5 Torr

Stopping ramp and monitoring pressure to see if it drops appropriate levels.

Wednesday, March 20, 2019, 14:10  

IGP1 pressure = 7.6e-06 Torr

TGHT 47.7Z, 0.16V

TBHT 50.1A, 0.63V

Autoramp at 0.1A/min both TGHT and TBHT to 280A and 230A respectively.

 Thursday, March 21, 2019, 08:12

IGP1 = 3.1e-05 Torr

TGHT = 51.4 A, 0.18V

TBHT=61.9A, 0.87V

Stopped autoramp

Manually ramping TGHT and TBHT while monitoring pressure

 Rampted up TGHT to 54A (reading 65 A), 0.5V and TBHT to 68A, 0.9V

Allowing pressure to stabilize

Manually tapped TGHT to 80A, .81V

Manually tapped TBHT to 90A, 1.3V

IGP1 = .0002 Torr

Will leave over night to allow pressure to drop

Friday, March 22, 2019, 08:17

IGP1 = 6.6e-06

TGHT = 88.8A, 0.81V

TBHT = 90.1A, 1.3V

Will manually tap ~100A on both TBHT and TGHT

Friday, March 22, 2019, 12:18

IGP1 = 1.28e-05 Torr

TGHT = 100.9A, 1.0V

TBHT = 101.2A, 1.5V

will allow pressure to drop slightly the autoramp at 0.1A/min for both TGHT and TBHT until 280A and 230A respectively

Friday, March 22, 2019, 14:51

IGP1= 7.4 e-06 Torr

TGHT = 100.8A, 1.0V

TBHT= 101.5A, 1.5V

Started autoramp at 0.1A/min for both TGHT and TBHT until 280A and 230A respectively

Tuesday, March 26, 2019, 08:18

IGP1 oscillated around ramping trip point 3.0e-05 while current slowly ramped to 280A (reached sometime during the night).

IGP1= 7.8e-06 Torr

TGHT= 283.4A, 4.2V

TBHT= 233.1A, 4.1V

Will continue ramp TGHT @0.2A/min up to 400A  (Omega slope set = 0.990, approx 1800 C, Elog#427)

Wednesday, March 27, 2019, 09:39

Target has been at 400A, OMEGA ~1400C since ~7pm of previous evening

TGHT = 400.2A, 6.45V

TBHT= 233.1A, 4.16V

IGP1= 3.1e-07 Torr

Autoramp TGHT to440A @0.2A/min

 Stopped autoramp at TGHT = 427.4 A and 7.00V, OMEGA= 1492 C

Wednesday, March 27, 2019, 14:14

Restarted TGHT autoramp @.2A/min up to 440A

Friday, March 29, 2019, 12:06

Changed OMEGA slope to 1.09 after checking with the analog pyrometer

IGP1 = 1.65e-07 Torr

TGHT = 441.3A, 7.5V

TBHT= 233.0A, 4.2V

Tapping TGHT to 450A @ ~1A/min while monitoring pressure

TGHT remained at 451A, 7.8 V  and  TBHT at 233.2A, 4.2 V,  for 10.5 hours while OMEGA Temperature ~1810 C.

Ramp-down was initiated with IGP1 = 1.7e-07 Torr

Ramp rate = 2A/min for TGHT and 1/min for TBHT

 Monday, April 01, 2019, 08:53

TGHT = 0A, 0.05V

TBHT= 0.01A, 0V

IGP1= 4.05e-08 Torr

Unloading Target

Target Final weight = 473 g

% Mass of ZrC+C+organics lost = 14.20 % compared to 13.95% theoretical organics content.

Final weight of 10 discs = 0.9250 g

% mass lost on this discs = 13.66%

The tube was slightly bent along the short axis

The discs expanded but more towards one side (possibly due to discrepancy in spring strength).

 One protective graphite disc added to each end

One end cap on each end

Monday, April 01, 2019, 16:35

Container was coated with TaC and a roll of graphite inserted inside the tube.   A couple of TaC coated Ta springs inside to keep graphite pressed against walls of cylinder.

Container wrapped with 2 Ta heat shields.

Desired temp = 1900 C, Omega slope set = 0.990, Auto ramping TGHT at 1A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down.  Sintering will proceed tomorrow.

Tuesday, April 02, 2019, 06:27

IGP1 = 4.37e-7 Torr

Current is manually tapped to 40 A

Tuesday, April 02, 2019, 08:12 

Pressure increased to IGP1 = 1.15e-5 Torr

and it stabilized to IGP1 = 2.32e-6 Torr after ~1.5 hrs

Autoramp is set to 1 A/min to 400 A

Tuesday, April 02, 2019, 08:45

Autoramp stopped momentarily, to stop current reduction

When pressure reduced to ~4e-5Torr, current was tapped manually to 50 A

Autoramp is set again, the conditions are

IGP1 = 2.5e-5 Torr

TGHT = 58.87 A, 0.36 V

Tuesday, April 02, 2019, 09:31

Autoramp stopped momentarily, to avoid current reduction

When pressure reduced, autoramp is set again,

the conditions are:

IGP1 = 2.9e-5 Torr, TGHT = 0.52 V, 71.5 A 

 Tuesday, April 02, 2019, 15:32

 Autoramp stopped momentarily, to avoid current reduction

conditions: IGP1=4.99e-5 Torr, TGHT = 0.78 V, 85.9 A

When pressure reduced, autoramp is set again,

 Tuesday, April 02, 2019, 22:37

Camera conexion was lost

Autoramp reached 400 A

the current was manually raise to 425 A to allow the completation of the process

Wednesday, April 03, 2019, 00:27

Camera connection still off

The current was reduced to 410 A to match with the estimated temperature 

Wednesday, April 03, 2019, 06:56

Camera connection is back, temperature reading is 1786 C

IGP1  5.01e- Torr

TGHT = 6.93 V, 412.22 A

Autoramp was set to -1A/min to 0A

Wednesday, April 03, 2019, 11:01

IGP1 = 1.67e-7 Torr

TGHT = 2.25 V, 179.53 A

Autoramp changed to -2 A/min 

Wednesday, April 03, 2019, 16:54

The tube was removed from the EVAP2,

The coating has a different color than regular coatings, but it doe not seem like the graphite adhered as expected. 

 Wednesday, April 03, 2019, 16:57

Tantalum tube was coated with TaC and wrapped with Ta heat-shield (3 layers)

Desired temp = 1900 C (expected TGHT ~445A/7.5V).

EVAP2 currently pumping down.

 Thursday, April 04, 2019, 05:12

IGP1 = 4.5e-7 Torr

The current is tapped manually to 40 A

After1 hour IGP1 = 1.18e-6 Torr, the autoramp was set to 1 A/min to 400 A

Thursday, April 04, 2019, 18:58

After 4 hours at ~1900 C:

IGP1 = 6.13e-7 Torr 

TGHT = 6.74 V, 416.06 A

 Sunday, April 07, 2019, 08:10

A graphite insert (with conical caps) was loaded in tantalum tube previously coated with TaC,

and wrapped with 3 tantalum foils,

a tanalum cap was inserted in one side of the Ta tube and sealed.

The tube was set in the EVAP2 and the furnace was pumped down.

IGP1 = 1.24e-7 Torr.

The current was tapped to 40 A

Autoramp was set to 1 A/min to 300 A.

At TGHT 335.53 S, 5.28 V the temperature was 1560

The autoramp was set to 450 A.

At TGHT 474.75 S, 7.96 V the temperature was 1560

The autoramp was set to 450 A.

To reach 2000 C, TGHT = 500.25 A, 8.45 V.

After 1hr the temperature stabilized to 1959 C

and the  current was increased to TGHT = 510.28 A, 8.64 V.

After stabilization the temperature reached 2010 C.

The current was decreased to TGHT = 503.15 A, 8.45 V

and the temperature stabilized to 2001 C.

The voltage increased  unexpectedly to 8.89 V and the temperature increased to 2055,

the current was reduced to keep the tube at 2000 C.

The voltage kept increasing and we kept decreasing the current to keep the tube at 2000

The final current before venting and getting out the container was

TGHT = 466.219 A and 8.467 V.

Test result: Broken tantalum tube.

 Wednesday, April 17, 2019, 09:03

An uncoated target container was loaded with a graphite insert and wrapped with 3 tantalum layers,

Two Ta caps were used

EVAP2 was pumped down, IGP1 = 5.14e-7 Torr

 The TGHT and TBHT current was tapped to 40 A manually

Autoramp was set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

The temperature reached 2000 C as planned 

the target container stayed at that temperature for 1 week.

Tuesday, April 23, 2019, 10:00

EVAP2 was vented and the target container was removed.

The container crystalized but did not break.

Tuesday, April 30, 2019, 09:33

Container was coated with TaC and wrapped with 2 Ta heat shields.

Desired temp = 1900 C, Omega slope set = 0.990, Auto ramping TGHT at 1A/min to reach 400A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230A (max). TBHT at 1A/min to reach 230A.

Good vac at 3.0e-5 Torr

Bad vac at 5.0e-5 Torr.

Chamber is currently being pumped down (since yesterday evening).

Tuesday, April 30, 2019, 10:25 

Current pressure at IGP1 = 5.17e-7 Torr

Manual tapping to 40A on TBHT and TGHT

TBHT 38.59A, 0.43V

TGHT43.69, 0.23V

waiting for pressure to stabilize.

 Tuesday, April 30, 2019, 15:15

Current pressure IGP1= 5.29e-07 Torr

Auto ramping TGHT at 1A/min to reach 400A, and TBHT at 1A/min to reach 230A.

Wednesday, May 01, 2019, 08:41

Target current of 400A reached around 00:19 am

Will tap up to 444A on TGHT as projected from plot of temperature vs current (attachment 1)

Current IGP1=5.91e-07 Torr

Wednesday, May 01, 2019, 09:54

At 444A 1900C not reached.  Continue tapping to 1900C (attachment 2)

1900 C reached at 459 A on THGT.

will leave at 1900C for 4 hours.

 Wednesday, May 01, 2019, 14:21

IGP1= 6.7e-7 Torr

After 4.5  hours, TGHT was ramped down @ 2A/min and TBHT @1A/min overnight

Thursday, May 02, 2019, 10:46

 Vented Evap 2 and removed the target container.

 Friday, May 10, 2019, 16:54

A tantalum tube was coated with TaC,and wrapped with three tantalum sheets,

the tube was set in the EVAP2 to sinter the TaC coating.

EVAP2 is currently pumping down. 

 Sunday, May 12, 2019, 18:40

IGP1 = 3.01e-7 Torr

Manually tapped current TGHT to 40 A

IGP1 = 4.89e-Torr

at the IGP1 = 1.961e-6 Torr the autoramp was set to 1 A/min to 380 A

IGP1 = 6.91e-7 Torr

TGHT = 6.133 V, 386.8 A, temperature 1682  C

IGP1 = 7.77e-7

TGHT=6.36V, 399A 1730 C

After 4 hours at 1895 C TGHT = 7.435 V and 445.781 A

TGHT was set -2 A/min to 0 A

The EVAP2 was vented with air and the tube was removed

 Tuesday, May 14, 2019, 13:56: Removed old HS w/ flexible lines & swapped in the FEBIAD. (HS waterlines are still purged.) Roughing.

Tuesday, May 14, 2019, 14:06: Turbo pump on. 

Tuesday, May 14, 2019, 14:22: Waterlines opened. Vacuum ok @ 5.34e-05T & dropping. 

Wednesday, May 15, 2019, 06:21

IGP1 = 5.99e-7 Torr,

manually tapping to 40 A.

Autoramp set to 2A/min to TGHT=580 A and TBHT=290 A

Tuesday, May 21, 2019, 08:13

IGP1= 1.43e-7 Torr

TGHT = 580.875 A, 11.22 V

TBHT =  4.45 V, 309.219 A

Temperature 1004 C measured at Ta foil

Ramp-down was initiated with IGP1 = 1.423e-07 Torr

Ramp rate = 2A/min for TGHT and 1/min for TBHT

EVAP2 was vented with air

 Tuesday, May 21, 2019, 14:20 Test FEBIAD removed - AS.

 Tuesday, May 21, 2019, 17:57

A tantalum tube previously coated with TaC and sintered was loaded with graphite foils.

The mass of the foils was 20.04 g.

The system will be heated to 2000 C to find out the corresponding current.

After that the tantalum tube will be trasferred to the EVAP1

and it will be heated there for 5 days. 

EVAP2 currently pumping down

 Thursday, May 23, 2019, 05:48

IGP1 = 2.516e-7 Torr

Manually tap to 50 A

Autoramp set to 1 A/min to 400 A

Thursday, May 23, 2019, 13:09 

IGP1 = 3.78e-6 Torr

TGHT = 6.4 V, 401.3 A

Temperature reading = 1629

Thursday, May 23, 2019, 13:09

Autoramp was set to 550 A at 1 A/min 

Stopped at 530 A

Thursday, May 23, 2019, 21:27

IGP1 = 6.77e-7 Torr

TGHT = 9.2175 V, 507.375 A

After 6 hours at ~2000 C the autoramp was set to -2 A/min to 0 A 

Friday, May 24, 2019, 8:46

EVAP2 was vented with air and the tantalum tube was removed, examined and transferred to EVAP1

Friday, May 24, 2019, 15:26

 A graphite insert with tantalum wires in its caps

was loaded in a tantalum tube, the system will be heated to 2000 C

and after 6 hrs at that temperature, it will be cooled and heated to 2000 C again.

The temperature will be hold at 2000 C for a 6 days.

Currently the chamber is being evacuated.

 Saturday, May 25, 2019, 06:01

IGP1 = 2.2e-7 Torr

Manually tapping to 50 A

Autoramp set to 1 A/min to 400 A

Saturday, May 25, 2019, 13:37

The autoramp was set to 450 A

Then it was manually tappe to 475 A 

Tuesday, June 04, 2019, 08:36

Each endcap is separated with a disc of graphite foil and rolled into packs of 5 within a foil envelope in a target boat.

There are also 4 coated springs, 2 on each side of the stack of endcaps.

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

Chamber pumped down overnight.

OMEGA slope = 0.99

IGP1 = 3.5e-7 Torr

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

Final desired temperature on OMEGA (tap)= 1800C

Tuesday, June 04, 2019, 11:54

IGP1= 6.1e-06 Torr

TGHT= 40 A

Begin autoramp to 400A at 1A/min

Out-gassing cycles observed.  Reduced autoramp to 0.5A/min

Currently TGHT=65A, 0.60 V

Wednesday, June 05, 2019, 08:27

TGHT = 321A, 4.9V @1149C

IGP1= 8.49 e-6 Torr

Set autoramp to 1A/min to530 A

Wednesday, June 05, 2019, 13:26

TGHT 530A, 9.2V

IGP1= 3.01e-05 Torr

OMEGA Temperature = 1689 Celsius

Set autoramp to 570A at 1A/min

 Wednesday, June 05, 2019, 15:51

Tapped manually to 1800 Celsius

TGHT 579A, 10.1V

IGP1= 2.06e-05 Torr

TGHT tapped down to 575A when OMEGA T ~1810 C

Thursday, June 06, 2019, 08:13

TGHT = 575A, 9.95V

OMEGA = 1809 C

IGP1 = 4.1e-7 Torr

Initiating auto-cool at -2.0A/min

Thursday, June 06, 2019, 16:00

After 1 hour  of TGHT at 0A and 0V, unloaded the Target boat.

Thursday, June 6, 2019, 16:43

A graphite insert with tantalum wires in its caps was loaded in a tantalum tube.

The system will be heated to 2000 C again (see elog 446)

Currently the chamber is being evacuated.

Friday, June 7, 2019, 16:40

Autoramp was set to 450 A at 1A/min to reach 2000 C

The temperature will be hold at 2000 C for a 4 days.

Tuesday, June 11, 2019, 16:46 

Autoramp is set to -2 A/min to 0 A

Wednesday, June 12, 2019, 17:01 

The tube present sever crystallization but is not broken and has some resistance against pressure.

Monday, June 17, 2019, 17:04

A LP-SIS target container  was wrapped with 3 heat shielding layers,

and an empty graphite insert of 17.4 g was introduce in it.

The system was loaded in the EVAP2 and the chamber is currently being evacuated.

The container will be heated to 2000 C in order to correlate the temperature, current and voltage,

as well as to condition the container.

 Tuesday, June 18, 2019, 07:28

The TGHT and TBHT current will be tapped to 40 A manually

Autoramp will be set to TGHT 1A/min to 500 A

and TBHT 0.5A/min to 230 A.

Tuesday, June 18, 2019, 20:51

After 2 hours at ~1800 C the container was cooled,

IGP1 = 1.2e-6 Torr

TGHT = 7.16 V, 447.094 A

TBHT = 4.19 V, 233.43 A

Temperature 1793 C

 Auto ramp TGHT = -2 A/min, TBHT = -1A/min 

Monday, June 24, 2019, 08:24

Total number of foils: 484

Total mass in  including container = 1495 grams

Total length packed 17.28 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate outgassing

Two TaC coated Ta wire springs inserted at either end.

Initially will heat via autoramp to OMEGA 1400 C , ramping TGHT at  0.1 A/min to reach 530A A (Omega slope set = 0.990)

Then temperature= (Correction to 1800C) 1900 C, Omega Slope set = 0.990, Auto TGHT at 0.2A/min to reach 700A, TGHT will be tapped up accordingly to reach desired Temp.

TBHT will be set fixed at 230 A (max).  TBHT at 0.1 A/min.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

System was pumped down on Friday June 24th, 2019.

IGP1= 3.3 e-07 Torr

(EPICS was down this morning and came back up around 930 a.m.)

Will proceed to manually tap up TGHT and TBHT to 40A as soon as EPICS stability confirmed

Mondayy, June 24, 2019, 15:30

TBHT = 39 A, 0.4V

TGHT=40 A, 0.1V

IGP1= 4.3 e-06 Torr and trending down

Autoramp increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

Tuesday, June 25, 2019, 08:40

Current has only increased to 53 A and pressure limit reached.  Lowered current back to 51 A on TGHT and TBHT.  Waiting for pressure to stabilize.

Tuesday, June 25, 2019, 12:16

TGHT 51.3 A, 0.39 V

TBHT 51.1 A, 0.58 V

IGP1 = 1.91 e-05 Torr

Starting autoramp with  increments to 0.1 A/min , to 400A on TGHT and 230A on TBHT

 Saturday, June 29, 2019, 22:45

Autoramp increments for TGHT set to 0.2 A/min

 IGP1=2.4 e-06 Torr

 Sunday, June 30, 2019, 07:46

Autoramp incrementsTGHT set to 0.1 A/min to prevent pressure spike. 

IGP1= 1.5 e-05 Torr

 Sunday, June 30, 2019, 08:26

Set autoramp increments on TGHT back to 0.2 A/min

Sunday, June 30, 2019, 15:47

Set autoramp max on TGHT to 500 A

Sunday, June 30, 2019, 21:15

OMEGA = 1240C

TGHT= 465A, 7.0V

TBHT = 233A, 3.2V

IGP1= 1.6 e-05 Torr

Set autoramp max on TGHT to 600A

Monday, July 01, 2019, 09:48

OMEGA = 1605 C

TGHT = 599A, 9.7V

TBHT = 233A, 3.2V

IGP1= 1.3 e-06 Torr

Set autoramp max on TGHT to 650A

Monday, July 01, 2019, 18:21

OMEGA = 1630 C

TGHT = 650 A, 10.6V

TBHT = 233A, 3.2V

IGP1 = 9.7 e-07 Torr

Set utoramp max on TGHT to 700A

Monday, July 01, 2019, 22:07

OMEGA = 1663 C

TGHT = 682A, 11.4V

TBHT = 233A, 3.2V

IGP1= 1.5 e-06 Torr

Set autoramp max on TGHT to 730A

Tuesday, July 02, 2019, 08:15

OMEGA =1700 C

TGHT = 730A, 12.0V

TBHT = 233A, 3.2V

IGP1= 1.1 e-06 Torr

Set autoramp max on TGHT to 750A and increments to 0.4A/min

Tuesday, July 02, 2019, 09:49

Temperature on OMEGA began dropping.  Changed OMEGA slope to 1.09 (Elog 371) and temperature reading = 1884 C.  Aborted autoramp and lowered TGHT current to 740A.

Tuesday, July 02, 2019, 12:14

Temperature and pressure have dropped at a consistent rate. 

IGP1= 9.6 e-07 Torr

OMEGA = 1715 C

Will tap up manually to 750A on TGHT

No appreciable increase in pressure will tap back down to 745A on TGHT

Tuesday, July 02, 2019, 13:11

OMEGA = 1675 C

TGHT = 745A, 12.4V

TBHT = 233A, 3.2V

IGP1 = 1.03 e-06Torr

 Will start to ramp- down TGHT @ -2.0A/min

OMEGA = 1354 C

TGHT = 495A, 7.01V

TBHT = 233.2A, 3.2V

IGP1= 2.2 e-07 Torr

Continue ramp-down TGHT @ -2.0A/min

Tuesday, July 02, 2019, 17:14

TGHT = 285.5A, 3.4V

TBHT = 232A, 3.1V

IGP1= 1.4 e-07 Torr

Start TBHT ramp-down at -1.0 A/min

Wednesday, July 03, 2019, 08:37

Turned off TGHT and TBHT

IGP1 = 7.8 e-08 Torr

Wednesday, July 03, 2019, 13:18

Final total weight of Target = 1489.5 g

Removed 18 discs after weighing.

 Wednesday, July 17, 2019, 10:57

Annealing of five RRR Nb samples following cold-working and resistance measurements.  Used to validate computational annealing model developed for SRF studies.  For more information contact Norman Muller, x6398.

Desired temperature 1025 C.

Five Nb samples wrapped with Nb foil were set on a tantalum boat (coated with TaC)

the tantalum boat was wrapped with two tantalum sheets.

The boat was installed in the EVAP2.

The initial vacuum was IGP1 = 1.26e-6 Torr.

Ramping rate 5 A/min to final current of 200 A.

Wednesday, July 17, 2019, 11:18 

At 155 A, the ramping rate was changed to 1 A/min 

Wednesday, July 17, 2019, 11:28 

The ramping was stopped at 167 A.

 Wednesday, July 17, 2019, 11:57

Conditions:

IGP1 = 1.65e-6 Torr

TGHT = 2.54 V, 174.46 A

Temperature ~ 950 C

Wednesday, July 17, 2019, 18:07

IGP1 = 1.16 e-6

TGHT = 3.18 V, 206.7 A

Temperature ~950 C

Cooling ramp 10 A/min 

 Vented with air

Suggestion for future annealing:

  Use tantalum boat without TaC coating.

Tuesday, July 30, 2019, 15:33

ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs).

Total weight= 470 g.

20 Analysis discs weighing 2.368 g (10 at each end).

Two springs (one at each end).

OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434

Target is being pumped down.

Wednesday, July 31, 2019, 09:31

Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434)

TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A.

Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each.

IGP1= 1.35e-06 Torr

Good vac at 3.00-5 Torr

Bad vac at 5.0e-5 Torr.

Wednesday, July 31, 2019, 12:02

At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min). 

Thursday, August 01, 2019, 08:42

TGHT = 54.7

TBHT = 54.3

IGP1 = 3.86e-5 Torr

Will changer heat ramp to .1A/min by changing wait interval to 60s

Tuesday, August 06, 2019, 07:14

OMEGA = 1212 C

TGHT = 344.7 A, 5.79 V

TBHT = 233 A, 4.17 V

IGP1 = 1.05 e-06 Torr

Autoramping to 400A at increments of 0.1A/min

Tuesday, August 06, 2019, 09:50

OMEGA = 1233 C

TGHT = 360 A, 6.05 V

TBHT = 233 A, 4.18 V

IGP1 = 1.21 e-06 Torr

increasing autoramp increments to .5A/min

Tuesday, August 06, 2019, 12:27

OMEGA = 1356 C

TGHT = 400.6 A, 6.92 V

TBHT = 233.8 A, 4.20 V

IGP1 = 1.95 e-06 Torr

Autoramping to 430 A on TGHT at 0.5 A/min

Tuesday, August 06, 2019, 14:02

OMEGA = 1447 C

TGHT= 430.9 A, 7.66V

TBHT = 233.2A, 4.2 V

IGP1= 2.01e-06 Torr

Autoramping to 440 A on TGHT at 0.5 A/min

Wednesday, August 07, 2019, 09:10

OMEGA = 1548

TGHT = 441.56 A, 8.2 V

TBHT = 233.3 A, 4.2 V

IGP1 = 6.21e-07 Torr

Manually ramping up to 1900C @ 1A/min

Wednesday, August 07, 2019, 09:43

Changed OMEGA slope to 1.09 as per eLog #434

OMEGA reads 1773 C @ TGHT 451A, 8.4V

IGP1 = 7.02 e-07

Wednesday, August 07, 2019, 10:56

OMEGA = 1903 C

TGHT = 483.5 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 1.7 e-06 Torr trending down

Wednesday, August 07, 2019, 11:40

OMEGA = 1914 C

TGHT = 483.5 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.5 e-06 Torr trending down

Decrease TGHT current to 480.4 A

Wednesday, August 07, 2019, 13:04

OMEGA = 1918 C

TGHT = 480.3 A, 9.4V

TBHT = 233.3 A, 4.3V

IGP1 = 1.28e-06 Torr

Decrease TGHT current to 474.5 A

Wednesday, August 07, 2019, 13:26

OMEGA = 1904 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.11e-06 Torr

Wednesday, August 07, 2019, 13:47

OMEGA = 1912 C

TGHT = 474.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.10e-06 Torr

Decrease TGHT to 471.8 A

OMEGA temperature went down to 1904 C

Wednesday, August 07, 2019, 14:26

OMEGA = 1911 C

TGHT = 471.8 A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 1.00e-06 Torr

Decrease TGHT to 469.0 A

OMEGA temperature down to 1904C

Wednesday, August 07, 2019, 15:45

OMEGA = 1912 C

TGHT = 468.8.8 A, 9.2V

TBHT = 233.3 A, 4.3V

IGP1 = 9.2e-07 Torr

Decrease TGHT to 466.0 A

OMEGA temperature down to 1903C

Wednesday, August 07, 2019, 22:09

OMEGA = 1924 C

TGHT = 466.8. A, 9.3V

TBHT = 233.3 A, 4.3V

IGP1 = 7.6e-07 Torr

Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V

OMEGA = 1900 C

Will allow Pressure to stabilize

 Thursday, August 08, 2019, 06:54

OMEGA = 1919 C

TGHT = 456.9 A, 9.1V

TBHT = 230.3 A, 4.2 V

IGP1 =5.7e-07 Torr

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

Thursday, August 08, 2019, 13:30

Target removed from Evap2.  Awaiting inspection by John.

Darwin Ortiz Rosales wrote:

Tuesday, July 30, 2019, 15:33 ZrC backup Target 12.6 cm disc length, 465 g total weight (no springs and no analysis discs). Total weight= 470 g. 20 Analysis discs weighing 2.368 g (10 at each end). Two springs (one at each end). OMEGA slope initially = 0.990  (was changed to 1.09 at higher Temperature as per eLog #434 Target is being pumped down. Wednesday, July 31, 2019, 09:31 Desired temp = 1900 C, Auto ramping TGHT at  0.1 A/min to reach 400A then  TGHT will be tapped up accordingly to reach desired temperature. (eLog 434) TBHT will be set fixed at 230A (max). TBHT at 0.1 A/min to reach 230A. Note: Initially both TGHT and TBHT will be ramped up at 0.3A/min up to 30A each. IGP1= 1.35e-06 Torr Good vac at 3.00-5 Torr Bad vac at 5.0e-5 Torr. Wednesday, July 31, 2019, 12:02 At 30A pressure was increasing a bit fast, therefore, the ramp was changed to increments of .1A every 120s (.05A/min).  Thursday, August 01, 2019, 08:42 TGHT = 54.7 TBHT = 54.3 IGP1 = 3.86e-5 Torr Will changer heat ramp to .1A/min by changing wait interval to 60s Tuesday, August 06, 2019, 07:14 OMEGA = 1212 C TGHT = 344.7 A, 5.79 V TBHT = 233 A, 4.17 V IGP1 = 1.05 e-06 Torr Autoramping to 400A at increments of 0.1A/min Tuesday, August 06, 2019, 09:50 OMEGA = 1233 C TGHT = 360 A, 6.05 V TBHT = 233 A, 4.18 V IGP1 = 1.21 e-06 Torr increasing autoramp increments to .5A/min Tuesday, August 06, 2019, 12:27 OMEGA = 1356 C TGHT = 400.6 A, 6.92 V TBHT = 233.8 A, 4.20 V IGP1 = 1.95 e-06 Torr Autoramping to 430 A on TGHT at 0.5 A/min Tuesday, August 06, 2019, 14:02 OMEGA = 1447 C TGHT= 430.9 A, 7.66V TBHT = 233.2A, 4.2 V IGP1= 2.01e-06 Torr Autoramping to 440 A on TGHT at 0.5 A/min Wednesday, August 07, 2019, 09:10 OMEGA = 1548 TGHT = 441.56 A, 8.2 V TBHT = 233.3 A, 4.2 V IGP1 = 6.21e-07 Torr Manually ramping up to 1900C @ 1A/min Wednesday, August 07, 2019, 09:43 Changed OMEGA slope to 1.09 as per eLog #434 OMEGA reads 1773 C @ TGHT 451A, 8.4V IGP1 = 7.02 e-07 Wednesday, August 07, 2019, 10:56 OMEGA = 1903 C TGHT = 483.5 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 1.7 e-06 Torr trending down Wednesday, August 07, 2019, 11:40 OMEGA = 1914 C TGHT = 483.5 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.5 e-06 Torr trending down Decrease TGHT current to 480.4 A Wednesday, August 07, 2019, 13:04 OMEGA = 1918 C TGHT = 480.3 A, 9.4V TBHT = 233.3 A, 4.3V IGP1 = 1.28e-06 Torr Decrease TGHT current to 474.5 A Wednesday, August 07, 2019, 13:26 OMEGA = 1904 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.11e-06 Torr Wednesday, August 07, 2019, 13:47 OMEGA = 1912 C TGHT = 474.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.10e-06 Torr Decrease TGHT to 471.8 A OMEGA temperature went down to 1904 C Wednesday, August 07, 2019, 14:26 OMEGA = 1911 C TGHT = 471.8 A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 1.00e-06 Torr Decrease TGHT to 469.0 A OMEGA temperature down to 1904C Wednesday, August 07, 2019, 15:45 OMEGA = 1912 C TGHT = 468.8.8 A, 9.2V TBHT = 233.3 A, 4.3V IGP1 = 9.2e-07 Torr Decrease TGHT to 466.0 A OMEGA temperature down to 1903C   Wednesday, August 07, 2019, 22:09 OMEGA = 1924 C TGHT = 466.8. A, 9.3V TBHT = 233.3 A, 4.3V IGP1 = 7.6e-07 Torr Cooling at 2A/min TGHT to 456.0 A, 9.0 V and 1A/min TBHT to 230.1 A, 4.2 V OMEGA = 1900 C Will allow Pressure to stabilize    Thursday, August 08, 2019, 06:54 OMEGA = 1919 C TGHT = 456.9 A, 9.1V TBHT = 230.3 A, 4.2 V IGP1 =5.7e-07 Torr Cooling at 2A/min TGHT and 1A/min TBHT Thursday, August 08, 2019, 13:30 Target removed from Evap2.  Awaiting inspection by John.

 Monday, August 12, 2019, 15:45

Visual inspection on the target was performed today.  See attachment for details.

Target container is slightly bent, and some visible crystallization on the container surface.  

The discs are nicely packed with only a slight expansion in length was measured.

No clogging inside the container nor the ionizer tube. 

Some sintered discs samples were collected and SEM will be perform later.